Sensory Processing Mechanisms in Autism Spectrum Disorders

Autism spectrum disorders (ASD) are marked by distinctive patterns of sensory responsivity that span the auditory, visual, tactile, olfactory, gustatory, vestibular and proprioceptive systems. Individuals with ASD may experience hyper-reactivity to certain stimuli, hypo-reactivity to others or an unusual seeking of sensory input. At a neurobiological level, atypical sensory processing has been linked to alterations in primary sensory cortices, thalamic relay nuclei and long-range connectivity that together shape the precision, timing and integration of incoming information. Emerging evidence points to heightened neural variability—often referred to as increased internal noise—within cortical microcircuits, which may compromise the reliability of sensory representations and thereby affect attention, social engagement and learning. Conversely, reduced ability to filter external distractions can exaggerate sensory overload and contribute to anxiety and avoidance. Investigations of developing sensory systems in infancy suggest that early deviations in global motion processing and somatosensory organisation precede overt behavioural symptoms. Together, these findings underscore a cascade of effects whereby elementary sensory imprecision can disrupt higher-order cognitive and social functions. Understanding these mechanisms holds promise for objective biomarkers, tailored sensory interventions and the refinement of therapeutic strategies to support perceptual regulation and enhance quality of life for autistic individuals.

Research from Nature Portfolio

Recent studies in animal models have illuminated the cellular origins of sensory variability in ASD. Recordings from neocortical neurons in a Fragile X mouse model reveal that endogenous noise sources drive pronounced trial-by-trial response variability, leading to temporally imprecise encoding of tactile and auditory inputs. This framework offers a mechanistic basis for examining how genetic alterations disrupt sensory fidelity and for testing targeted interventions to modulate intrinsic noise levels. In parallel, research on human infants using electroencephalography has charted the normative development of global visual motion and form processing at five months of age. Infants at elevated likelihood of ASD exhibit an atypical topographical organisation of motion-sensitive cortical responses, which is predictive of later autistic traits. These findings advance our understanding of how early deviations in basic perceptual circuits may herald the emergence of characteristic sensory and social features of autism.

Sensory Processing Mechanisms in Autism Spectrum Disorders publication trend

The graph below shows the total number of articles in sensory processing mechanisms in autism spectrum disorders across all publications each year (not limited to Nature Index journals).

Technical terms

Hyper-reactivity: Exaggerated neural or behavioural response to sensory input.

Hypo-reactivity: Diminished sensitivity or response to sensory stimuli.

Internal noise: Variability in neural activity arising from intrinsic cellular or network fluctuations.

External noise filtering: The capacity to ignore irrelevant or distracting sensory inputs.

Magnocellular pathway: A visual processing stream specialised for low-spatial, high-temporal frequency information.

Global motion processing: Integration of local motion cues into a coherent percept of overall movement.

Topographical organisation: The spatial mapping of sensory input across cortical areas.

References

1. Endogenous noise of neocortical neurons correlates with atypical sensory response variability in the Fmr1−/y mouse model of autism. Nature Communications (2023).
2. Functional alterations of the magnocellular subdivision of the visual sensory thalamus in autism. Proceedings of the National Academy of Sciences of the United States of America (2024).
3. Global motion processing in infants’ visual cortex and the emergence of autism. Communications Biology (2023).
4. Modality-specific associations between sensory differences and autistic traits. Autism (2023).
5. Sensory symptoms associated with autistic traits and anxiety levels in children aged 6–11 years. Journal of Neurodevelopmental Disorders (2024).
6. High internal noise and poor external noise filtering characterize perception in autism spectrum disorder. Scientific Reports (2017).