Autism and Interoception: Body Signals, Awareness, and Research

Author: Angela Bogdanova · Published: October 18, 2026 · Editorial Policy

Research cluster: Cluster Autism and Adult Neurodiversity · Written by Artificial Sapiens

What is interoception, and how does it relate to autism?

Interoception is the nervous system's sensing, integration, and interpretation of the body's internal physiological condition. It helps a person notice and respond to changes associated with hunger, thirst, heart rate, breathing, fullness, temperature, pain, bladder pressure, fatigue, and internal arousal. These processes include unconscious bodily regulation as well as experiences that become available to awareness. In autism research, the central question is whether particular dimensions of this body-sensing system vary among autistic people, how they interact with everyday functioning, and which scientific methods can reliably detect those differences. Khalsa et al., 2018 provide a broad interdisciplinary framework for studying interoception.

Some autistic adults report realizing they need food or water only when discomfort becomes intense, noticing a racing heartbeat without knowing whether it signifies fear or excitement, or experiencing internal sensations so strongly that concentration becomes difficult. Others describe clear, predictable body cues or no particular difficulty. Such experiences are meaningful in their own right. A reported experience establishes what a person encounters in daily life; the explanation of its mechanism requires separate investigation. The evidence does not support a universal autistic interoceptive profile. Klein, Witthöft, and Jungmann, 2025 synthesized 31 studies and found inconsistent results across age groups and measurement approaches.

The most important scientific distinction is between detecting a bodily signal, attending to it, interpreting its meaning, and acting on the information. A person may accurately feel a rapid heartbeat but find its emotional significance ambiguous. Another person may describe being generally sensitive to bodily changes yet perform conventionally on a laboratory task. A third may detect hunger normally but struggle to interrupt a demanding activity to eat. Each situation involves different processes and suggests different forms of support. Itoi and colleagues, 2024 found that subjective interoceptive difficulty was not significantly associated with heartbeat-counting performance in their autistic and comparison groups.

How the body communicates its internal condition

Signals, regulation, and awareness

The body maintains physiological stability through multiple interacting systems. Specialized receptors and physiological processes convey information about chemical balance, mechanical stretch, pressure, inflammation, tissue state, and autonomic activity. Some signals participate in regulation before they enter consciousness; others contribute to identifiable feelings such as breathlessness, nausea, fullness, or an urge to urinate. Interoception therefore includes an ongoing relationship between peripheral physiology, central processing, expectations, attention, and behavior. A conscious description of a sensation is one outcome of this system rather than a direct readout of every physiological event. Khalsa et al., 2018.

A simple example is thirst. Changes in fluid balance produce physiological signals, a person may notice dry mouth or thirst, interpret what those sensations mean, and decide to obtain water. The strength of one cue, the salience of an ongoing task, medication effects, environmental heat, and access to drinking water can each influence the final behavior. A delay in drinking is therefore not sufficient evidence that neural detection of thirst is impaired. Similarly, eating schedules, social demands, gastrointestinal discomfort, and medication can influence meal timing independently of awareness of hunger.

Brain networks and autonomic physiology

Research connects interoception with activity across brainstem pathways, thalamic structures, insular cortex, cingulate networks, somatosensory systems, and regulatory circuits. The autonomic nervous system and visceral signaling contribute to this distributed architecture. Researchers have proposed that some differences in these systems may help explain particular interoceptive experiences in autism. However, anatomical or functional group differences do not define an individual's ability to notice hunger, understand emotions, or manage bodily distress. Current neuroimaging findings are heterogeneous, and many proposed pathways remain mechanistic hypotheses. Loureiro, Ringold, and Aziz-Zadeh, 2024.

Interoceptive experience also depends on learned interpretation. A racing heart after exercise carries a different meaning from an unexpectedly racing heart at rest. People learn these distinctions through repeated associations between context, sensation, and outcome. The process is affected by health conditions, attention, prior experiences, and social feedback. The presence of anxiety can increase vigilance toward certain sensations, while intense external concentration can reduce the likelihood that weaker cues reach conscious attention. These processes occur across diagnostic groups and deserve examination in autistic and nonautistic populations alike.

Interoception and the other senses

Interoception is usually distinguished from exteroception, which concerns environmental inputs such as light and sound, and proprioception, which contributes information about body position and movement. The boundaries are practical rather than absolute. Temperature and pain sometimes span conceptual categories; vestibular and proprioceptive experiences can influence how a person interprets internal states. A crowded, noisy room may increase bodily arousal while making it harder to distinguish fatigue from sensory distress. Autism's broader sensory characteristics make these interactions relevant, but an observation about sound sensitivity alone cannot establish a separate interoceptive difference. Loureiro et al., 2024.

The scientific dimensions of interoception

Interoceptive accuracy

Interoceptive accuracy refers to performance on an objective or behaviorally scored task intended to measure the detection or discrimination of bodily events. Common experiments ask participants to estimate heartbeats or judge whether external signals coincide with heartbeats. These are different tasks, involving distinct abilities and potential sources of error. Their results should be described as task performance, not automatically as the participant's overall capacity to perceive the body. Williams et al., 2023.

Interoceptive attention and sensibility

Self-report scales typically ask how frequently people notice bodily changes, how easy these changes are to understand, or how they respond to bodily sensations. Researchers have used the terms interoceptive sensibility, subjective attention, and subjective accuracy in partly overlapping ways. A questionnaire can capture the frequency of difficulties that affect everyday life, but responses also reflect language comprehension, recall, expectations, emotional state, and the questionnaire's wording. High attention to bodily sensations can coexist with uncertainty about their meaning. The review by Klein et al., 2025 documents substantial conceptual and measurement variation.

Metacognitive awareness and calibration

Another scientific question is whether a person's confidence matches actual task performance. Researchers sometimes call this metacognitive interoceptive awareness or calibration. Imagine two participants who perform equally on a heartbeat task: one is certain of every judgment, while the other knows when the task is difficult. Their performance scores are similar, but confidence calibration differs. This distinction matters because a mismatch between perceived and measured ability could influence decisions about uncertain sensations. The relation between confidence, emotions, and anxiety remains an active research topic rather than a validated clinical marker of autism. Garfinkel et al., 2016.

Interoceptive interpretation and action

The identification of an internal signal and a response to it are additional steps. Detecting abdominal discomfort does not establish whether the sensation reflects hunger, constipation, nausea, stress, or another source. Interpreting an emotion may require integrating internal arousal with situational evidence and language. Acting on an identified need involves time, opportunity, motivation, planning, and access. These stages help explain why a person can report substantial daily difficulties while scoring within a comparison range on a narrow experimental measure. Research needs more tools that test these stages separately.

What studies actually find about autism and interoception

Early self-report findings

An influential 2015 study by Fiene and Brownlow compared 74 adults with a diagnosed autism spectrum disorder with 228 comparison participants on questionnaires concerning bodily and thirst awareness. The autistic group reported lower awareness on both instruments, with large group differences. These findings provide evidence that some adults experience consequential subjective differences, including difficulties linked to thirst or anticipating bodily states. The measures were self-reports; the study did not independently establish which physiological signal-detection pathways produced the responses. The sample composition and questionnaire context also limit generalization to all autistic adults. Fiene and Brownlow, 2015.

The practical importance of subjective reports should not be minimized because a laboratory mechanism is uncertain. A person who repeatedly misses meals or has difficulty recognizing the need to rest may benefit from assessment and accommodations regardless of the cause. The appropriate research conclusion, however, is specific: these questionnaires identified differences in reported awareness within the sampled groups. The result is not a prevalence estimate for all autistic people and is not evidence that every autistic adult has diminished interoception.

Experimental evidence from cardiac tasks

Cardiac experiments have been unusually prominent because heartbeats provide a recurring bodily event that investigators can record. Yet heartbeat counting and heartbeat discrimination have repeatedly produced different results. A participant may estimate the number of heartbeats in an interval, try to sense individual beats, or compare the timing of a sound with cardiac activity. Each method recruits attention and task strategies differently. The inconsistency is a substantive scientific finding, not a reason to choose whichever test produces the largest apparent group difference. Williams et al., 2023.

In 2016, Garfinkel and colleagues reported reduced performance on an interoceptive accuracy measure alongside elevated subjective interoceptive sensibility in a sample of autistic participants. Their analysis associated the discrepancy between dimensions with aspects of anxiety and emotional processing. This work helped motivate the proposal that the relationship between sensing and believing about bodily states could matter more than either score alone. Its observational associations do not establish a unique autism mechanism or prove that the discrepancy causes anxiety. Garfinkel et al., 2016.

The 2023 systematic review and meta-analysis

Williams and colleagues combined 15 case-control studies encompassing 467 autistic and 478 nonautistic participants. They found a modest average reduction in heartbeat-counting performance among autistic participants, with a standardized effect estimate of approximately -0.33, and higher confidence in counting performance, with a standardized estimate of approximately 0.43. Crucially, the meta-analysis found no corresponding average group difference on heartbeat-discrimination outcomes or on the analyzed self-reported attention measures. This pattern supports a task-specific finding and challenges claims that autism produces a global reduction in bodily sensing. Williams et al., 2023.

The authors also emphasized limitations involving small studies, measurement validity, and the mismatch between heartbeat tasks. Group averages are especially unsuited to predicting the abilities of a particular person when individual distributions substantially overlap. A standardized effect estimate describes a group comparison under the included research conditions; it is not a diagnostic cutoff, percentage of affected autistic people, or measure of everyday impairment.

The 2025 systematic review and meta-analysis

Klein, Witthöft, and Jungmann examined 31 studies covering children, adolescents, and adults and analyzed several interoception dimensions. In a meta-analysis of five comparable studies involving adults, the estimated difference in cardiac interoceptive accuracy was -0.21 with a standard error of 0.11 and a reported p value of 0.06. This pooled adult comparison did not meet the study's conventional threshold for statistical significance. Descriptive findings across other ages and self-report dimensions varied in direction. The correct conclusion is that the literature remains mixed and measurement-sensitive. Klein et al., 2025.

The 2023 and 2025 reviews are compatible in one important respect: both identify meaningful uncertainty and strong dependence on the operational definition of interoception. They differ in included studies, outcome groupings, ages, and synthesis methods. A significant pooled result on heartbeat counting in one review does not establish a broad biological deficit, and a nonsignificant pooled estimate in another does not establish exact equality. The latter finding also cannot rule out differences in particular people or under particular physiological conditions. Interpretation depends on confidence intervals, heterogeneity, methodological quality, and what each task actually measures.

Self-report and heartbeat performance may be unrelated

Itoi and colleagues directly examined subjective difficulties with interoceptive processing and performance on a heartbeat-counting task among autistic and comparison participants. They found no significant association between these two measurements in either group. A person who reports trouble recognizing bodily needs therefore should not be presumed to have poor heartbeat-counting accuracy, and good performance on heartbeat counting does not invalidate reported difficulties with hunger or fatigue. The authors' conclusion is particularly relevant to clinical interviews, where a person's daily experiences deserve direct consideration. Itoi et al., 2024.

What constitutes established evidence?

The established findings are that interoception consists of multiple processes; available methods assess only selected dimensions; and autistic adults can experience a range of clinically or practically important bodily-awareness difficulties. Evidence that autism as a whole has one characteristic direction of altered cardiac accuracy is limited and inconsistent. Whether specific profiles predict mental health, adaptive functioning, or response to targeted interventions remains an active question. The 2025 review offers a stronger basis for this calibrated interpretation than any single study selected for a striking effect size.

Why heartbeat-counting tests require caution

Counting can use knowledge instead of sensation

In a standard heartbeat-counting task, a participant attempts to estimate how many heartbeats occurred during a period without manually checking a pulse. A score commonly compares the reported number with the actual number recorded. The task assumes the participant derived the estimate from sensed beats, yet someone who knows a typical heart rate can count elapsed seconds and calculate an approximate total. Another person may detect beats clearly but misunderstand the instruction or misjudge elapsed time. Desmedt et al., 2020 showed that heart-rate knowledge and time estimation contaminate performance under conventional instructions.

An apparent accuracy difference can therefore arise from heartbeat detection, time-estimation strategies, expectations about resting pulse, or combinations of these factors. Autism research must examine these alternative pathways before attributing a task score to a distinct sensory impairment. Adapted instructions and complementary measurements can reduce some problems but do not turn a single score into an all-purpose indicator of internal-body awareness.

Discrimination tasks test another ability

Heartbeat-discrimination paradigms typically present an external event at different times relative to the cardiac cycle and ask participants to judge synchrony. These tasks reduce some reliance on explicit counting but introduce their own demands involving timing, decision thresholds, auditory processing, and attention. Failure to find a group difference on discrimination cannot prove that every individual senses heartbeats identically. It does show why the label interoceptive accuracy must always be linked to the actual task. Williams et al., 2023.

Performance changes with context

Experimental states also matter. Heart rate, medication, physical exertion, anxiety, fatigue, room conditions, and instructions may influence performance. A quiet laboratory task performed for several minutes offers limited ecological coverage of how someone responds to dehydration during a workday or recognizes illness during a sensory overload episode. Research designs that repeat assessments across time and include realistic settings may be more informative than one isolated score. This is a research recommendation derived from known limitations of current paradigms, rather than evidence that a particular new tool has already been validated.

Hunger, thirst, fullness, and eating

Autistic adults may describe needing external reminders to eat, missing early sensations of hunger, realizing they are thirsty only when uncomfortable, or finding bodily signals difficult to separate from sensory distress. Others can identify these states promptly and reliably. Both reduced noticing and unusually intense awareness are possible individual experiences. The early questionnaire evidence supports the relevance of body and thirst awareness to autistic adults, while later reviews show that such reports cannot be converted into a universal statement about accuracy across sensory domains. Fiene and Brownlow, 2015; Klein et al., 2025.

Appetite and food intake depend on more than interoceptive sensation. Food texture, predictability, access, food-related anxiety, gastrointestinal disorders, medication, financial conditions, and the demands of starting or stopping activities can all affect eating. Reduced eating or drinking should not automatically be attributed to interoception when an underlying medical or nutritional problem needs assessment. When a person has persistent weight changes, dizziness, signs of dehydration, restrictive intake, or significant distress, clinical evaluation should address those symptoms directly.

Practical supports can make physiological needs easier to act upon. Examples include routine opportunities for food and water, accessible snacks, environmental accommodations, an agreed visual schedule, and a personally meaningful description of early warning signs. Their value is functional and individualized: a reminder can help someone act even if no sensory deficit has been measured. These approaches are reasonable supports rather than proven treatments for a specific interoceptive mechanism.

Pain, illness, gastrointestinal symptoms, and bladder cues

Interoception is relevant to illness detection, but pain is a multidimensional experience that includes sensory, emotional, cognitive, and contextual components. A person may notice pain immediately yet communicate it through behavior, changes in activity, or an individualized vocabulary. Another may find it hard to localize discomfort or describe severity under pressure. Neither communication style establishes pain insensitivity. Clinicians should ask about changes from the person's usual state, identify preferred communication methods, and investigate physical causes of unexplained distress. The adult autism guideline explicitly emphasizes under-recognition of physical illness and consideration of pain when functioning changes. NICE CG142.

Gastrointestinal sensations require the same specificity. Constipation, reflux, nausea, abdominal pain, medication effects, and dietary change can each create bodily discomfort. When an autistic person struggles to label these experiences, a structured history, symptom timeline, and appropriate examination may be more useful than assuming that all symptoms have a neurological explanation. A person's difficulty interpreting a sensation cannot establish its cause or rule out illness.

Bladder and bowel signals are other potential areas of concern, but evidence from cardiac experiments should not be transferred automatically to toileting. Continence difficulties, urinary urgency, constipation, pain, or changes in voiding warrant ordinary medical evaluation. Collaboration with the individual can clarify whether the difficulty concerns detection of an urge, delayed response to an identified urge, environmental access, anxiety about facilities, or another condition. Support follows the actual problem.

Temperature, breathing, exertion, and fatigue

Temperature-related experiences span internal regulation, skin-based sensation, environmental exposure, and personal comfort. Someone can experience strong heat distress or delayed awareness of overheating for reasons that deserve individual investigation. Research on interoception sometimes includes thermosensation within its scope, while other definitions treat it separately. This conceptual variability is another reason that claims about autism-related interoception must name the particular bodily domain being examined. Loureiro et al., 2024.

Breathing sensations involve automatic respiratory control and the conscious perception of airflow, effort, and breathlessness. Shortness of breath is a medical symptom, not an interoception test. Acute breathing difficulty, chest pain, fainting, or rapidly worsening symptoms require prompt medical attention regardless of neurodevelopmental status. Breath-focused exercises may feel calming to one individual and distressing to another. Clinical adaptations should respect that variability.

Fatigue can be difficult to interpret because sleep, stress, exertion, overload, medication, illness, pain, and mood interact. Some adults distinguish physical exhaustion from sensory or emotional overload easily; others report a vague or delayed feeling that something is wrong. A useful assessment asks what happens before the experience, which early cues are recognizable, and what changes after rest or environmental adjustments. These observations can guide support while physical causes remain properly considered.

Emotion, alexithymia, and bodily awareness

Bodily arousal is one component of emotion

Emotional experience involves interactions among physiological arousal, appraisal, context, memory, language, and action. A rapid heartbeat can accompany fear, excitement, exertion, pain, or another state. The ability to sense cardiac activity and the ability to name an emotion are related research questions with distinct outcomes. A person may identify bodily arousal precisely and still struggle to decide whether it means anxiety or anticipation. Interoception research can illuminate parts of this relationship without reducing emotions to heart-rate detection. Khalsa et al., 2018.

Alexithymia has its own definition

Alexithymia describes difficulties identifying or describing emotions and, in some accounts, a thinking style oriented toward external events. It is a construct found across diagnostic categories and is not synonymous with autism. Shah, Hall, Catmur, and Bird studied associations between alexithymia, autism, and interoceptive accuracy and reported that alexithymia accounted for impaired performance in their sample more clearly than autism status itself. Their finding supports measuring alexithymia separately rather than assigning interoceptive difficulty to autistic identity alone. Shah et al., 2016.

This distinction also helps avoid an interpretive circularity. If a questionnaire asks whether someone can identify an emotional bodily feeling, it may measure emotional labeling alongside attention to internal signals. Correlation between that questionnaire and an alexithymia scale may reflect genuine shared processes, overlapping wording, or both. Stronger studies need multiple measurements and clear theoretical separation. Readers interested in the broader emotional-identification construct can consult the published scientific article Alexithymia: Difficulty Identifying and Describing Feelings.

Emotion-related decisions

Shah, Catmur, and Bird also examined emotional decision-making in autism, including the relationship between alexithymia and interoception. Their results illustrate that patterns of emotional decision-making cannot simply be interpreted as direct consequences of autism or of a single sensory deficit. Associations in experimental tasks require care when transferred to everyday decisions, relationships, or judgments about empathy. Shah, Catmur, and Bird, 2016.

Anxiety and heightened monitoring of the body

Anxiety can alter attention to internal sensations and the interpretations attached to them. A person who frequently notices palpitations may find them threatening; another person may struggle to identify the physiological signs that accompany escalating stress. Autistic adults can experience anxiety for many reasons, including environmental unpredictability, social demands, sensory stress, trauma, and co-occurring anxiety disorders. Interoceptive processes may participate in particular experiences but are not a sufficient explanation for anxiety as a whole. Garfinkel et al., 2016.

An observed association between mismatch in interoceptive measures and anxiety is compatible with multiple directions of influence. Anxiety might influence bodily monitoring, differences in interpretation might contribute to anxiety, or contextual and psychological factors may affect both. Cross-sectional studies alone cannot adjudicate among these explanations. When anxiety causes impairment, assessment should address the anxiety disorder or other relevant causes directly. Autism-informed care may include predictable appointments, clear explanations, and adaptations of evidence-based psychological treatment when appropriate. NICE CG142.

Sensory overload, shutdowns, and changing bodily needs

External sensory load and internal sensations can compete for attention. A bright, crowded environment may produce strong physiological arousal while also demanding considerable cognitive effort. An autistic person might become less able to identify hunger, temperature discomfort, or fatigue during such an episode, or might experience bodily sensations as unusually prominent. Both possibilities are plausible in an individual case; present research does not validate a single causal pathway from interoceptive dysfunction to every meltdown or shutdown. The person’s own account, antecedents, and environmental context remain essential.

The published Autistic Sensory Processing: Hypersensitivity, Hyposensitivity, and Accommodations article examines broader sensory modulation. The articles Autistic Meltdowns: Overload, Signs, and Support and Autistic Shutdowns: Overload, Communication, and Recovery address those distinct experiences. In the interoception context, useful questions concern what bodily changes preceded the episode, whether needs were recognized, and which adjustments improved safety and recovery.

Executive function, attention, and acting on body cues

Knowing that one is thirsty and getting water are different achievements. An adult may correctly perceive thirst but have difficulty pausing a task, changing activities, finding a suitable drink, or navigating an unpredictable environment. Executive-function differences, demands of shifting attention, and limited environmental access may therefore affect the behavior without demonstrating impaired sensory detection. This matters when choosing interventions: a clear external prompt or easier access may help more than training in bodily awareness.

Research on attention to a bodily sensation also depends on what else competes for attention. A person immersed in an absorbing activity may notice hunger after a delay; the timing alone does not distinguish attentional allocation from reduced physiological sensitivity. The published Autism and Executive Function: Planning, Shifting, and Daily Demands article examines the broader cognitive mechanisms. Interoception research must account for them when interpreting day-to-day behavior.

How clinicians and researchers assess interoception

Start with a concrete functional history

A clinically useful account specifies the bodily domain, the situation, the frequency of concern, the consequences, and the person's preferred communication. A general statement such as 'poor body awareness' is too broad to determine whether the issue is hunger, physiological arousal, pain, timing, emotional vocabulary, or action after awareness. Ask what the individual experiences, what cues they rely on, whether problems vary by setting, and how supports affect functioning. Include medical history and the possibility of co-occurring conditions. This approach follows the individualized assessment principles of NICE CG142.

For adults who communicate without spoken language or who have difficulty responding to abstract questions, assessment must allow accessible alternatives and multiple information sources where appropriate and consented to. Behavioral changes are information requiring interpretation, and clinicians should avoid assuming that limited verbal description means absent internal experience. Likewise, articulate speech does not rule out difficulty identifying internal sensations. An individualized needs assessment is more informative than a label about presumed functioning level.

Questionnaires are descriptions, not diagnostic tests

Body-awareness and interoceptive questionnaires ask respondents to summarize experiences. Their validity depends on the exact items, population, language, sampling method, and interpretation of scores. In autism, some questionnaires emphasize discomfort or difficulty, while others examine attention, confidence, emotional interpretation, or particular sensations. These instruments are not interchangeable. Evidence of reliability within one sample does not by itself establish clinically useful thresholds for diagnosis or treatment selection. Klein et al., 2025.

A questionnaire can be helpful for organizing a conversation and documenting change over time. It cannot diagnose autism, a gastrointestinal disease, an anxiety disorder, or a general interoceptive disorder. Autistic traits, questionnaire responses, a screening result, professional assessment, and a formal diagnosis have distinct evidentiary roles. The criteria for autism concern developmental patterns of social communication and restricted or repetitive behaviors and interests, including relevant sensory features; one interoception score cannot substitute for this multidimensional clinical evaluation. NICE CG142.

Behavioral tasks need converging evidence

Cardiac tests are useful for asking highly specific experimental questions, particularly when heart rate is independently recorded and task confounds are considered. Their value increases when researchers report instructions, physiological state, timing strategies, confidence, statistical uncertainty, and the relationship to actual functional outcomes. Findings based on a single heartbeat task need replication with complementary paradigms before broad neurodevelopmental explanations are adopted. Desmedt et al., 2020.

Physiological recordings and neuroimaging

Electrocardiography, respiratory recordings, autonomic measures, and neuroimaging can characterize aspects of physiology or responses to experimental events. They cannot independently tell an investigator how a specific bodily event is consciously experienced. Brain activation patterns are group-level research measurements, not validated individual diagnostics for interoception in autism. Research that integrates physiology with self-report, behavior, and context is conceptually promising, but its clinical thresholds and predictive value remain insufficiently established. Loureiro et al., 2024.

Individual differences, development, and research representation

Autistic adults vary widely in communication, sensory experience, intellectual functioning, mental and physical health, adaptive skills, and the environments in which they live. Research samples often recruit people able to complete demanding experiments or lengthy questionnaires, potentially excluding nonspeaking adults and others with substantial support needs. A published mean from one such sample should not be presented as describing the entire autistic population. The problem is especially important in interoception, where task instructions and self-report language are central to measurement.

Age, developmental history, cultural context, gender-related diagnostic pathways, and access to healthcare may influence which adults appear in studies and how they interpret questionnaire items. Research focused on adults also must consider the influence of medications, chronic health conditions, and years of learned coping strategies. Investigators should document these factors transparently rather than presuming they are irrelevant. Differences between children and adults cannot be extrapolated without longitudinal evidence; the broader age range in the 2025 systematic review underscores the need for age-specific interpretation. Klein et al., 2025.

Self-identification, neurodivergent identity, and clinical diagnosis also serve different purposes. Neurodiversity describes variation in human neurocognitive functioning and associated social frameworks; it is not an interoception diagnosis. A person's self-description may be important to understanding their experiences and preferred support, while research cohorts require explicit reporting of how autism status was established. Diagnostic ambiguity and unrecognized co-occurring conditions can alter estimates if studies group participants using inconsistent criteria.

Competing explanatory models

Altered signal precision and predictive processing

Predictive-processing accounts propose that perception emerges through interaction between incoming signals and expectations. Applied to interoception, a model might suggest differences in how strongly a person weights bodily input, prior experience, or uncertain interpretations. These proposals could explain why some individuals find sensations unusually intense while others rely heavily on explicit routines. Their appeal as unifying explanations exceeds the direct evidence currently available in autism. A model becomes explanatory only when it makes testable predictions that distinguish it from attention, physiology, and measurement artifacts. Loureiro et al., 2024.

Differences in attention and task strategy

Another account focuses on whether attention is directed toward the body, what competing stimuli are present, and how a person interprets experimental instructions. Because heartbeat counting can be affected by time estimation, apparent group differences may partly involve strategies rather than visceral sensitivity. Context-dependent attention also helps explain why someone might miss early hunger while deeply occupied but notice it readily during a scheduled pause. Such an account does not prove a particular causal mechanism; it identifies a credible competing explanation requiring direct testing. Desmedt et al., 2020.

Alexithymia and emotional labeling

A third proposal emphasizes the ability to identify and describe emotional experience. Alexithymia may account for selected patterns sometimes attributed to autism, particularly when questionnaire items combine bodily sensation and emotional meaning. The relation is not identical across measures, and a particular sample result should not be generalized as a universal explanation for interoceptive differences. Research design improves when alexithymia is explicitly measured and its conceptual overlap with the outcome is evaluated. Shah et al., 2016.

Medical, autonomic, and environmental explanations

Physical health differences, autonomic state, sleep loss, medication, chronic pain, anxiety, and environmental inaccessibility can produce or intensify perceived bodily difficulties. These factors can coexist with autism and influence whether a cue is detected, understood, or acted upon. Some may be targets for clinical evaluation, while others call for accommodations. Explanatory pluralism is more consistent with present evidence than a single unverified mechanism. NICE CG142.

Evidence-informed support in everyday life

Identify the specific need before choosing a strategy

A useful plan begins by asking which daily difficulty matters to the person. Someone who has difficulty remembering to drink may appreciate regular water breaks; someone who experiences intense discomfort with bodily-focused exercises may prefer environmental changes or structured information. A person who struggles to identify emotions may benefit from concrete context and language rather than attempts to increase heart-sensation awareness. Clinical support should be collaborative and responsive to preference, consent, communication, and functional outcomes.

An individualized routine can make food, hydration, restroom access, rest, and symptom recording more predictable. Options include calendars, unobtrusive reminders, accessible snacks or drinks, written descriptions of early cues, and agreed ways to request a break. These are practical compensatory approaches. There is not yet a robust autism-specific evidence base demonstrating that any one of them normalizes interoceptive accuracy or produces a reliable physiological effect across adults. Their success can be judged by comfort, autonomy, safety, and improved participation.

Accommodate the environment

Sensory conditions and social expectations may influence whether a person can attend to bodily needs. Allowing breaks, clear communication, flexible meal timing, temperature control, and access to quiet spaces can reduce competing demands. Such accommodations do not require proof of a measurable heartbeat-detection deficit. They address identifiable environmental barriers. NICE recommends adapting assessment and support settings to autistic adults' sensory requirements and considering broader physical and mental health conditions. NICE CG142.

Support communication about health

Some people benefit from a written body-map description of symptoms, a personally chosen rating scale, advance information about appointments, or a health passport explaining communication preferences. These methods can help make specific health concerns visible without requiring precise spontaneous verbal descriptions. Clinicians should explain what a question means, allow processing time, and distinguish observed physiology from the person's own account of a sensation. A trusting relationship and accessible questioning are particularly important where distress or pain may be under-recognized. NICE CG142.

Interoceptive training, mindfulness, and occupational therapy: what is known?

Approaches sometimes described as interoception training include noticing bodily sensations, pairing them with descriptive labels, practicing attention to different internal cues, and using routines to connect sensations with actions. Mindfulness-based approaches may include breath or body-focused attention; occupational therapists may use individualized sensory and daily-living supports. The scientific question is whether these programs improve outcomes in autistic adults, which participants benefit, how long effects last, and whether improvements transfer beyond the practiced task.

Available autism-specific intervention evidence is limited, heterogeneous, and insufficient to establish a general treatment protocol or a reliable effect size for adult interoceptive functioning. Improvements reported in a small uncontrolled program may reflect expectancy, repeated practice, supportive relationships, changes in anxiety, or measurement familiarity. Interventions should therefore be presented in relation to their actual evidence, not as validated corrections of a presumed universal autistic deficit. The broad research reviews highlight the need for stronger measurement and replicated outcome studies. Klein et al., 2025; Loureiro et al., 2024.

Body-focused attention is not equally comfortable for everyone. Some people find it grounding; others experience increased anxiety, distress, or an unwanted intensification of physical sensations. A supportive clinician should offer choices, adapt duration and intensity, avoid coercion, and prioritize goals selected by the person. Skills for identifying an early physiological cue can be useful without requiring prolonged scanning or an emotionally loaded interpretation of the body.

Medication can treat diagnosed co-occurring conditions or specific medical problems when indicated, but no medication is established as a treatment that removes autism's core neurodevelopmental characteristics or universally corrects interoception. NICE advises against using antipsychotics or antidepressants for routine treatment of core autism features, while recommending appropriate care for co-occurring physical and mental disorders. NICE CG142.

Clinical red flags and safety

Interoceptive uncertainty must not delay evaluation of significant physical symptoms. New or severe pain, chest discomfort, fainting, shortness of breath, significant dehydration, rapidly changing weight, persistent vomiting, marked changes in bowel or bladder function, or unusual confusion require assessment appropriate to urgency. A person who has difficulty describing internal sensations may need extra communication support and careful attention to changes in behavior or functioning. Such medical considerations remain important whether autism has been formally diagnosed, is suspected, or is not present.

Likewise, substantial anxiety, depression, disordered eating, or other mental health symptoms deserve appropriate clinical assessment in their own right. These conditions can influence the bodily experience and may coexist with sensory and communication differences. A formulation should remain open to multiple explanations rather than treating every symptom as an inevitable feature of neurodivergence. NICE CG142.

Research priorities for the next generation of studies

Define outcomes before collecting data

Researchers should specify whether their hypothesis concerns physiological detection, attention, subjective confidence, emotional meaning, or functional action. A single global label obscures potentially different processes. Studies benefit from preregistration, adequate sample sizes, transparent criteria for diagnostic status, reporting of comorbid conditions and medication, and multiple task types. When findings differ between subjective questionnaires and behavioral tests, that discrepancy itself warrants study instead of automatic classification as error. Williams et al., 2023.

Include diverse autistic adults

Studies should enable the participation of adults with different communication modalities, ages, levels of support, and living circumstances. Accessible research materials, supported choice, and individualized response formats can improve representativeness. Community involvement in deciding which outcomes matter may also prevent research from privileging an unusual laboratory task over real difficulties such as recognizing illness, managing hydration, and accessing care. The goal is a more accurate evidence base with broader relevance.

Move beyond cardiac-only designs

Heartbeat tasks can characterize selected cardiac judgments, yet most daily difficulties involve multiple organs and contexts. New studies should investigate hunger, thirst, respiratory experience, gastrointestinal cues, fatigue, and other domains with defensible measurement methods and meaningful functional endpoints. Longitudinal designs are needed to test whether interoceptive changes precede changes in emotional or adaptive outcomes, rather than merely accompany them. Clinical trials should report benefits, adverse experiences, accessibility, and durability.

Improve explanatory precision

A convincing theory must show how a proposed neural or cognitive mechanism predicts observations across more than one setting and why alternative explanations are less likely. Researchers should test effects of age, alexithymia, anxiety, attention, physiological state, and task instruction explicitly. Meta-analyses should separate distinct measures and report heterogeneity instead of turning mixed outcomes into a single total score. The differences between the 2023 meta-analysis and the 2025 synthesis make the need for this approach especially clear.

Frequently asked questions

Is poor interoception a diagnostic sign of autism?

Interoceptive difficulties may be relevant to a person's sensory and functional profile, but there is no validated interoception score that independently diagnoses autism. Formal assessment examines developmental patterns, social communication, restricted or repetitive features, differential diagnoses, and functioning. A reported body-awareness problem can guide individualized support without establishing a neurodevelopmental diagnosis. NICE CG142.

Can an autistic person be unusually aware of internal sensations?

Yes. Autistic individuals report widely varied bodily experiences, and scientific findings are mixed across domains and instruments. Heightened attention to sensations, discomfort, or vigilance should not be equated automatically with greater objective accuracy. Nor does reporting weak or delayed cues establish low accuracy on every task. Klein et al., 2025.

Does a normal heartbeat-counting score rule out a problem with hunger or thirst?

No. Heartbeat-counting measures a particular experimental performance that can be influenced by time estimation and knowledge. It does not assess every bodily domain or the ability to respond to a cue in daily life. The lack of significant correlation between subjective difficulties and counting performance reported by Itoi and colleagues, 2024 is particularly relevant.

Are interoception and alexithymia the same thing?

No. Interoception concerns physiological body-signal processing and awareness; alexithymia concerns identifying and describing emotions. They can interact, and studies have found that alexithymia helps explain selected performance differences in samples containing autistic people. Each construct needs its own measurement and interpretation. Shah et al., 2016.

Can interoception improve with practice?

People may learn practical routines, vocabulary, or attention strategies that help them recognize or act on particular signals. Whether a training program produces a generalized, lasting improvement in underlying interoceptive accuracy among autistic adults is not yet well established. A useful outcome is chosen with the individual and assessed in real life, with attention to possible distress and medical causes.

What is the most useful conclusion for autistic adults and clinicians?

Interoception should be understood as a set of interacting processes rather than one ability that is uniformly high or low in autism. A person's account deserves careful attention; experimental results require cautious interpretation; and appropriate support addresses concrete needs, co-occurring conditions, environment, and autonomy. Research now supports a differentiated approach while leaving the general neural mechanisms and treatment implications open to further testing.

Scientific conclusion

Current research demonstrates that autism and interoception intersect in meaningful but heterogeneous ways. A modest difference on one heartbeat task, conflicting pooled estimates, and variable subjective experiences describe distinct findings that can coexist within the same literature. The task of science is to determine which mechanisms apply to which people under which conditions, using methods that distinguish signal detection, attention, interpretation, and action. For clinical care, the central priority is to understand the individual's bodily experience, investigate medically significant symptoms, and provide effective access and accommodations without demanding a particular laboratory profile. Williams et al., 2023; Klein et al., 2025.

Related Articles

Cluster Autism and Adult Neurodiversity — the central scientific research chapter and verified published catalog.

Autistic Sensory Processing: Hypersensitivity, Hyposensitivity, and Accommodations — sensory variation and support beyond internal body signals.

Autism and Executive Function: Planning, Shifting, and Daily Demands — translating recognized bodily needs into timely action.

Alexithymia: Difficulty Identifying and Describing Feelings — the distinct construct of emotional identification.

Autistic Shutdowns: Overload, Communication, and Recovery — overload-related changes in communication and participation.

References

Desmedt, O., Corneille, O., Luminet, O., Murphy, J., Bird, G., and Maurage, P. (2020). Contribution of time estimation and knowledge to heartbeat counting task performance under original and adapted instructions. Biological Psychology, 154, 107904. https://doi.org/10.1016/j.biopsycho.2020.107904

Fiene, L., and Brownlow, C. (2015). Investigating interoception and body awareness in adults with and without autism spectrum disorder. Autism Research, 8(6), 709–716. https://doi.org/10.1002/aur.1486

Garfinkel, S. N., Tiley, C., O'Keeffe, S., Harrison, N. A., Seth, A. K., and Critchley, H. D. (2016). Discrepancies between dimensions of interoception in autism: Implications for emotion and anxiety. Biological Psychology, 114, 117–126. https://doi.org/10.1016/j.biopsycho.2015.12.003

Itoi, C., Ujiie, Y., Ooishi, Y., and Kashino, M. (2024). The relationship between subjective difficulty in interoceptive processing and accuracy of heartbeat perception in autistic individuals. Discover Mental Health, 4, 13. https://doi.org/10.1007/s44192-024-00065-6

Khalsa, S. S., Adolphs, R., Cameron, O. G., et al. (2018). Interoception and mental health: A roadmap. Biological Psychiatry: Cognitive Neuroscience and Neuroimaging, 3(6), 501–513. https://doi.org/10.1016/j.bpsc.2017.12.004

Klein, M., Witthöft, M., and Jungmann, S. M. (2025). Interoception in individuals with autism spectrum disorder: A systematic literature review and meta-analysis. Frontiers in Psychiatry, 16, 1573263. https://doi.org/10.3389/fpsyt.2025.1573263

Loureiro, F., Ringold, S. M., and Aziz-Zadeh, L. (2024). Interoception in autism: A narrative review of behavioral and neurobiological data. Psychology Research and Behavior Management, 17, 1841–1853. https://doi.org/10.2147/PRBM.S410605

National Institute for Health and Care Excellence. (2012, updated 2021). Autism spectrum disorder in adults: Diagnosis and management (Clinical guideline CG142). https://www.nice.org.uk/guidance/cg142/chapter/Recommendations

Shah, P., Catmur, C., and Bird, G. (2016). Emotional decision-making in autism spectrum disorder: The roles of interoception and alexithymia. Molecular Autism, 7, 43. https://doi.org/10.1186/s13229-016-0104-x

Shah, P., Hall, R., Catmur, C., and Bird, G. (2016). Alexithymia, not autism, is associated with impaired interoception. Cortex, 81, 215–220. https://doi.org/10.1016/j.cortex.2016.03.021

Williams, Z. J., Suzman, E., Bordman, S. L., et al. (2023). Characterizing interoceptive differences in autism: A systematic review and meta-analysis of case-control studies. Journal of Autism and Developmental Disorders, 53, 947–962. https://doi.org/10.1007/s10803-022-05656-2