Sensory reactivity

Sensory reactivity describes atypical responses to sensory stimuli, encompassing three patterns: hyper-reactivity (oversensitivity, distress at ordinary stimuli that most people tolerate), hypo-reactivity (reduced response, apparent indifference to stimuli that would normally produce a clear reaction), and unusual interest or seeking of sensory aspects of the environment. Approximately 90% of autistic individuals show atypical sensory experiences across the lifespan and across cultures, and DSM-5 Criterion B.4 (added in 2013) made sensory reactivity a formal autism diagnostic criterion for the first time. The phenomenon is operationalized in the RAADS-14 Sensory Reactivity subscale (3 items, max 9; Eriksson, Andersen, & Bejerot, 2013, Molecular Autism, CC BY 2.0) and in dedicated adult instruments including the Sensory Perception Quotient (Tavassoli, Hoekstra, & Baron-Cohen, 2014).

The construct overlaps with but is distinct from several adjacent frameworks: Sensory Processing Disorder (SPD), proposed by occupational therapist A. Jean Ayres but not formally included in DSM-5 or ICD-11; the Highly Sensitive Person (HSP) construct from Aron, which describes Sensory Processing Sensitivity as a normal-population trait dimension; and predictive-coding accounts that locate autism sensory differences in altered prior-precision balance during perceptual inference. This entry covers all of these, with the autism-DSM-5 lens as the primary anchor and the RAADS-14 subscale as the operational connection to the LBL Adult Autism Test.

Sensory reactivity matters at several levels.

For diagnosis. The 2013 addition of sensory hyper- and hyporeactivity to DSM-5 autism criteria reflected decades of accumulated evidence that atypical sensory processing is among the most reliable autism-associated features. Approximately 90% of autistic individuals show atypical sensory experiences, the trait is observed cross-culturally and across the lifespan, and sensory differences can be detected as early as 6 months of age in infants later diagnosed with autism. Sensory reactivity is therefore one of the most clinically useful autism markers, even though the RAADS-14 has only 3 items measuring it.

For daily functioning. Sensory reactivity has substantial impact on what an autistic adult can tolerate — what clothes are wearable, what foods are edible, what workplaces are habitable, what social environments are accessible. The 2018 Bishop-Fitzpatrick et al. study on social support and stress in autistic adults found that perceived stress (substantially driven by sensory overload) was a strong predictor of quality of life. Many late-diagnosed adults describe sensory accommodation as one of the most immediately life-changing post-diagnostic shifts.

For accurate clinical care. Treating sensory-driven anxiety as if it were primary anxiety often produces partial response. Sensory features that look like ADHD inattention, social anxiety, or depression resolve substantially when sensory accommodation is provided, but conventional treatment for those conditions does not address sensory reactivity directly. Understanding sensory reactivity as a distinct construct enables environmental rather than purely pharmacological approaches.

For self-recognition. Many adults arrive at autism self-screening because of decades of sensory difficulty — finding clothing tags intolerable since childhood, requiring noise reduction to function, having strong food-texture aversions, needing predictability of routine to manage daily life. The RAADS-14 Sensory Reactivity subscale gives users a separate score for this dimension; the LBL Adult Autism Test routes a sensory-dominated profile to the Sensory-Driven archetype with cross-tool referrals to the Sleep-Cognition Optimizer (sensory sensitivity and sleep are bidirectionally related).

DSM-5 Criterion B.4 names three distinguishable patterns of sensory reactivity. Most autistic adults show some of all three, often in different modalities — hyper-reactive to sound but hypo-reactive to interoceptive cues like hunger, for example.

The three patterns are not mutually exclusive and often coexist. A common AuDHD presentation, for example, is hypo-reactive interoception (poor recognition of hunger, thirst, fatigue) combined with hyper-reactive auditory processing (difficulty filtering background noise) combined with sensory seeking through visual stimming. Comprehensive sensory profiling considers each modality separately rather than summarizing into a single hyper-vs-hypo dichotomy.

The DSM-5 (2013) added sensory reactivity to autism diagnostic criteria for the first time. Previous editions (DSM-IV, DSM-III-R) had not included sensory features, despite extensive evidence accumulating in the literature since the original Kanner and Asperger descriptions. The 2013 addition was widely welcomed and reflected the field’s consensus that sensory differences are central to autistic experience.

Why it took until 2013

Sensory atypicalities have been documented in autism since Kanner’s original 1943 case series and Asperger’s 1944 paper, but they were not formally added to diagnostic criteria for seventy years. Several reasons account for the delay:

• Prior emphasis on social-cognitive features — the post-1985 cognitive era of autism research focused on theory of mind and social communication, with sensory features often described as secondary or context-dependent.
• Measurement difficulty — sensory reactivity is heterogeneous across modalities and individuals, harder to operationalize than language or social communication features.
• Conflation with Sensory Processing Disorder — the SPD framework developed in occupational therapy was sometimes positioned as an alternative to autism diagnosis rather than as a feature within it, which delayed integration.
• Accumulated evidence by 2013 — by the early 2010s, multiple lines of evidence (questionnaire studies, neuroimaging, animal models, infant prospective studies) converged sufficiently for DSM-5 inclusion. The Tavassoli, Hoekstra, and Baron-Cohen 2014 SPQ paper documented prevalence rates approaching 90% in autistic adults.

Sensory reactivity affects all sensory modalities, and most autistic adults show different reactivity patterns across modalities rather than uniform hypersensitivity. The five external (exteroceptive) senses are listed below, with examples of common autism-associated patterns; sections vi covers the internal (interoceptive and proprioceptive) modalities.

The five external senses are not the full picture. Modern sensory science distinguishes them from internal senses that have substantial autism relevance.

Interoception

Interoception is the perception of the body’s internal state — heart rate, hunger, thirst, fatigue, temperature, pain, emotional arousal, fullness, breath. The Frontiers in Psychiatry June 2025 systematic review and meta-analysis of 31 studies on autism and interoception (2025, Frontiers in Psychiatry) found systematic differences between autistic and non-autistic adults across three dimensions:

• Cardiac interoceptive accuracy (cIA) — objective ability to perceive heartbeat without external cues; mixed findings across studies, with Shah et al. specifically reporting no significant group difference.
• Interoceptive sensibility (IS) — self-reported tendency to attend to bodily states; often reduced in autism.
• Interoceptive awareness (IAW) — broader awareness and integration of bodily signals; consistently atypical in autism.

The clinical implications are substantial. Approximately 50% of autistic individuals show comorbid alexithymia (difficulty identifying and labeling emotions), and the meta-analysis found this is mediated by interoceptive deficits rather than being a separate condition. The Interoception Sensory Questionnaire (ISQ), validated in autistic adults, finds that approximately 74% of autistic adults endorse significant interoceptive confusion unless bodily signals are extreme. The "alexisomia" framing extends this from emotional to broader bodily awareness: difficulty identifying and labeling bodily states more generally.

Practically, interoceptive differences mean that an autistic adult may not recognize hunger until they are very hungry, may not notice fatigue until they are exhausted, may not recognize emotional arousal until it has reached an overwhelming level. This contributes to autistic burnout patterns: by the time the body’s signals are unambiguous enough to be recognized, the underlying state has often progressed beyond easy intervention.

Proprioception

Proprioception is the sense of body position and movement in space — awareness of where limbs are without looking, how much force is being used, how to coordinate balance and movement. Proprioceptive differences in autism include clumsiness (sometimes meeting criteria for Developmental Coordination Disorder), difficulty with fine motor coordination, and unusual posture or gait patterns. Some autistic adults report that deep-pressure input (weighted blankets, tight clothing, sustained hugs) is particularly regulating, which may relate to enhanced proprioceptive feedback.

The eight-modality framework

Some occupational-therapy frameworks list eight sensory modalities total: the five exteroceptive senses, plus interoception, proprioception, and vestibular sense (balance and movement perceived through the inner ear). Vestibular differences are also reported in autism, though less systematically studied; vestibular seeking (spinning, rocking, swinging) is a common autism stim and is sometimes a regulating activity rather than purely a stereotyped behavior.

One of the most influential recent theoretical frameworks for autism sensory differences is the predictive coding account, developed across multiple papers by Lawson, Friston, Quattrocki, Seth, and others.

Core theory

Predictive coding is a general theory of brain function in which perception is constructed by combining (1) prior expectations about what the world should look like and (2) bottom-up sensory signals that update those expectations. The brain’s perceptual experience reflects the precision-weighted balance of priors and incoming sensory evidence. Healthy perception involves constant updating: priors are adjusted when sensory evidence consistently contradicts them, and incoming signals are interpreted in the light of stable priors.

The autism predictive coding hypothesis

Lawson, Rees, & Friston (2014) and Quattrocki & Friston (2014) proposed that autism involves attenuated precision of priors (or equivalently, increased relative weighting of bottom-up sensory prediction errors). On this account, autistic perception is more directly driven by raw sensory input and less filtered through stable expectations. This single mechanism predicts several autism-associated features:

• Sensory hyper-reactivity — raw sensory signals carry more perceptual weight than in non-autistic perception, so ordinary stimuli feel more intense.
• Detail-focused processing — lower prior precision means top-down "gestalt" predictions are weaker, so individual sensory features remain salient.
• Distress with change — without stable predictive priors, environmental change produces large prediction errors that feel overwhelming.
• Social-communication differences — rapid implicit mentalizing relies on stable priors about other minds; reduced prior precision could explain why autistic implicit mentalizing differs from non-autistic.
• Interoceptive differences — interoception involves the same predictive-coding machinery applied to internal signals; altered prior precision affects emotional and bodily awareness in ways consistent with alexithymia/alexisomia patterns.

Recent refinements

The 2024 ScienceDirect review of predictive coding for actions and emotions in autism, the 2025 Frontiers Mind Brain Education piece, and the 2025 PMC review of predictive coding and attention in neurodevelopmental disorders all extend the framework. Refinements include:

• Differential precision across hierarchical levels — the deficit is not uniform; specific hierarchical levels of the predictive system show altered precision while others do not.
• Interoceptive prediction error — the framework now centers interoception, not just exteroception. Quattrocki & Friston (2014) and the 2025 integrative model both treat interoceptive prediction-error precision as central to autism phenomenology.
• Context-dependent precision — precision weighting can vary by context, mood, and arousal, which may explain within-person variability in sensory reactivity that any fixed-trait model misses.

Predictive coding is one theoretical framework among several (alongside weak central coherence, executive dysfunction, the empathizing-systemizing model, and the monotropism account). It has the advantage of providing a unified mechanistic account that connects sensory features, social-communication features, and interoceptive features into a single explanatory framework.

Sensory Processing Disorder (SPD), originally called Sensory Integration Dysfunction, was proposed by occupational therapist A. Jean Ayres in the 1960s and 1970s and developed extensively in the occupational therapy literature thereafter. SPD posits that some children and adults have neurologically-based difficulty processing sensory input across one or more modalities, producing functional impairment that is not better explained by another diagnosis.

What SPD describes

The Lucy Jane Miller framework, the most widely cited contemporary SPD taxonomy, identifies three subtypes:

• Sensory Modulation Disorder (SMD) — difficulty regulating responses to sensory input, presenting as over-responsivity, under-responsivity, or sensory seeking
• Sensory-Based Motor Disorder (SBMD) — sensory difficulties affecting motor planning and coordination, including dyspraxia
• Sensory Discrimination Disorder (SDD) — difficulty distinguishing among similar sensory inputs

Overlap with autism

The relationship between SPD and autism is complex. Many people described as having SPD meet autism criteria when comprehensively evaluated, and many autistic people receive sensory-integration occupational therapy under SPD-framework treatment. The two are not mutually exclusive, and the practical treatment approach is similar regardless of which formal label is used. The DSM-5’s decision to add Criterion B.4 effectively absorbed the most autism-relevant subset of SPD into autism diagnosis without endorsing SPD as a separate category.

The Highly Sensitive Person (HSP) framework, developed by Elaine Aron and Arthur Aron beginning in 1996, describes Sensory Processing Sensitivity (SPS) as a personality trait dimension estimated to apply to approximately 15–20% of the general population. The framework is widely known in popular psychology and increasingly examined in academic research.

The DOES framework

Aron summarizes SPS through the acronym DOES:

• Depth of processing — tendency to think deeply about experiences, considering implications and connections
• Overstimulation — readier overwhelm in stimulating environments
• Emotional reactivity and empathy — stronger emotional responses, including positive emotions
• Sensitivity to subtle stimuli — noticing details and changes that others miss

SPS is measured by the Highly Sensitive Person Scale (HSPS; Aron & Aron 1997), a 27-item self-report instrument. Lower-order factor analyses sometimes identify three subdomains: ease of excitation, low sensory threshold, and aesthetic sensitivity.

SPS and autism: related but distinct

The 2018 Acevedo, Aron, Pospos, & Jessen review in Philosophical Transactions of the Royal Society B ("The functional highly sensitive brain") summarized the neuroimaging evidence for SPS and explicitly discussed overlap and difference with autism, ADHD, anxiety disorders, and other conditions. The review concluded that SPS shows neural patterns distinguishable from these clinical conditions while also showing some overlap, particularly in regions related to attention and sensory integration.

The practical implication: a person who identifies strongly with HSP framing may be highly sensitive in the SPS sense, may be autistic, may be both, or may have another condition (anxiety, ADHD, complex PTSD) that is producing similar phenomenology. The HSP framework is useful but is not a substitute for clinical evaluation when functional impairment is significant.

The RAADS-14 Screen developed by Eriksson, Andersen, and Bejerot (2013, Molecular Autism, CC BY 2.0) identified Sensory Reactivity as one of three factors via factor analysis. The Sensory Reactivity subscale is the smallest of the three: 3 items with maximum total score 9, focused on sensory hyper-reactivity and overwhelm.

What the items capture

The three items map to specific sensory phenomena:

• Item 1 — tactile hyper-reactivity — the most-described sensory pattern in autism per the 2020 review of tactile sensory abnormalities
• Item 2 — sensory overwhelm and the isolation response — captures both the experience of overwhelm and the regulating response of withdrawal that is characteristic of autistic sensory profiles
• Item 3 — auditory hyper-reactivity to specific sounds — the example sounds (vacuum cleaners, loud talking) reflect common autism community accounts

Scope limits of the brief subscale

The 3-item RAADS-14 Sensory Reactivity subscale focuses on hyper-reactivity and overwhelm. It does not directly measure:

• Hypo-reactivity (apparent indifference to pain, temperature, hunger, fatigue) — equally part of DSM-5 Criterion B.4 but absent from this subscale
• Sensory seeking (visual fascination, deep-pressure seeking, stimming) — named in DSM-5 Criterion B.4 examples but not captured here
• Interoception (internal-state perception) — substantially relevant to autism but a distinct construct
• Modalities other than tactile and auditory — visual, olfactory, gustatory, vestibular, and proprioceptive features are not directly probed

This is a known scope limit of the brief 14-item instrument. A respondent with substantial hypo-reactivity or sensory-seeking patterns may score low on this subscale despite having clinically significant sensory features. For comprehensive sensory profiling, instruments such as the Sensory Perception Quotient (Tavassoli et al. 2014; 35-item validated SPQ; Cronbach’s alpha .93), the Adolescent/Adult Sensory Profile, or the Sensory Over-Responsivity Inventory provide broader coverage.

The Sensory-Driven archetype

The LBL Adult Autism Test classifies respondents into one of five archetypes based on sub-dimensional profile across the three RAADS-14 subscales. The Sensory-Driven archetype indicates that the respondent’s pattern is dominated by Sensory Reactivity subscale responses, with Mentalizing Deficits and Social Anxiety contributing less. The archetype description notes that social-cognitive features are present but less prominent in this profile, and the cross-tool referral suggests the LBL Sleep-Cognition Optimizer because sensory sensitivity and sleep are bidirectionally related — sensory hyper-reactivity often disrupts sleep, and poor sleep heightens sensory hyper-reactivity.

Sensory accommodation is one of the highest-impact interventions for autistic adults, and many late-diagnosed adults describe sensory accommodation as the most immediately life-changing post-diagnostic shift. Several categories of accommodation have evidence support or strong qualitative endorsement.

Auditory accommodations

• Noise-reducing earplugs — Loop, Vibes, Mack’s, custom-molded options. Many autistic adults wear these in environments that would otherwise be intolerable (open-plan offices, restaurants, transit, social events).
• Active noise-canceling headphones — particularly useful for steady noise (HVAC, traffic, fluorescent buzz) but can paradoxically make one more aware of intermittent sounds.
• Sound-controlled environments — choosing quiet workplaces, requesting workspace modifications, time-boxing exposure to high-noise environments.

Visual accommodations

• Lighting control — warm-temperature bulbs (under 3000K), avoidance of fluorescent lights, dimmer switches, indirect lighting, blue-light-blocking glasses
• Visual environment design — reducing visual clutter in workspaces and homes, choosing workplaces with windows and natural light
• Screen accommodations — dark mode, reduced screen brightness, specific color temperatures, regular breaks from screen exposure

Tactile accommodations

• Clothing — identifying tolerable fabrics (often cotton, bamboo), removing tags, choosing seamless options, prewashing new clothing, avoiding fabrics with consistent intolerance
• Deep pressure — weighted blankets (limited but supportive evidence), compression clothing, snug rather than loose fit; the deep-pressure sensation is regulating for many autistic adults
• Texture preferences — choosing daily-contact materials (sheets, towels, furniture upholstery) that are tolerable rather than fighting through aversive textures

Routine and predictability

Beyond modality-specific accommodations, environmental predictability reduces the prediction-error load that may underlie much of autism sensory overwhelm (per the predictive coding account in section vii). Practical applications include consistent daily routines, advance notice of schedule changes, predictable meal patterns, and reduced novelty in sensory environments. The 2018 Bishop-Fitzpatrick et al. study on social support and stress in autistic adults found that perceived stress reduction was a strong predictor of quality of life; sensory accommodation is one of the most direct ways to reduce daily stress load.

Food and eating

• "Safe foods" — identifying foods that are reliably tolerable across taste, texture, smell, and temperature, and ensuring access to them; this is a coping strategy with good qualitative support and limited but supportive research evidence
• Predictable meal timing — particularly important when interoceptive hunger signals are unreliable
• ARFID consideration — Avoidant/Restrictive Food Intake Disorder is increasingly recognized as overlapping with autism in adults whose sensory-driven food restriction meets clinical thresholds

Interoception training

Interoceptive awareness can be supported through specific exercises — Mahler’s Interoception Curriculum, Kelly Mahler’s adult adaptations, and structured body-scan practices. The 2025 Frontiers in Psychiatry meta-analysis indicates that interoception is a partially modifiable feature, with implications for the alexithymia and emotion-regulation difficulties that frequently co-occur with autism.

If you would like to see your own RAADS-14 Sensory Reactivity subscale score in context with the Mentalizing and Social Anxiety subscales, the LBL Adult Autism Test computes all three and reports your sub-dimensional profile alongside the total score. The Sensory-Driven archetype description includes the cross-tool referral to the Sleep-Cognition Optimizer, given the bidirectional relationship between sensory sensitivity and sleep.

Note that the 3-item RAADS-14 Sensory Reactivity subscale focuses primarily on tactile and auditory hyper-reactivity. If you have substantial hypo-reactivity, sensory seeking, interoceptive differences, or features in modalities not directly probed by these items, this subscale may underestimate your sensory profile. For comprehensive sensory profiling, the Sensory Perception Quotient (Tavassoli et al. 2014) or clinical occupational therapy assessment provide broader coverage.