Atypical sensory reactivity influences auditory attentional control in adults with autism spectrum disorders.
Adults with autism detect sounds the same but their brains allocate less top-down control and more bottom-up capture, tying objective ERPs to subjective sensory sensitivity.
01Research in Context
What this study did
Researchers played tones to two groups: adults with autism and neurotypical peers. While the adults listened, the team recorded brain waves called ERPs.
They added extra sounds to make the task harder. Then they compared how each group’s brain responded to the main tones.
What they found
Both groups hit the same number of correct buttons. Yet their brains worked differently.
The autism group showed weaker top-down control and stronger bottom-up sound capture. The more sensitive a person said they were to noise, the stronger this pattern.
How this fits with other research
Liu (2025) looked deeper and found the early, automatic step (MMN) is normal, but the later, attention step (P3b) is smaller. Together the two papers show the break point is after the brain notices the sound but before it decides what to do with it.
Redquest et al. (2021) showed autistic adults habituate less to repeated beeps. That slower habituation may feed the heightened bottom-up signal seen here.
Lortie et al. (2017) found a similar P3 gap in kids listening to voices. The adult and child data line up, hinting the attention gap starts early and stays.
Adams et al. (2024) also found slower N1 and less gamma in the same age group. Their behavioral scores link the neural delay to real-life sensory and social trouble, giving these lab waves everyday meaning.
Why it matters
If your client covers his ears yet still hears every air-duct click, he may need external filters like noise-canceling headphones, not more prompts to “ignore it.” Try giving the sound a job: turn it into an SD for a break request or a self-monitoring tally. That turns the involuntary capture into a teachable moment.
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02At a glance
03Original abstract
Frequent observations of atypical sensory reactivity in people with autism spectrum disorders (ASD) suggest that the perceptual experience of those on the Spectrum is dissimilar to neurotypicals. Moreover, variable attention abilities in people with ASD, ranging from good control to periods of high distractibility, may be related to atypical sensory reactivity. This study used auditory event-related potential (ERP) measures to evaluate top-down and bottom-up attentional processes as a function of perceptual load, and examined these factors with respect to sensory reactivity. Twenty-five age and IQ-matched participants (ASD: 22.5 year, SD = 4.1 year; Controls: 22.8 year, SD = 5.1 year) completed the Adolescent/Adult Sensory Profile prior to performing a modified 3-stimulus (target, non-target, and distractor) auditory oddball target detection task EEG was recorded during task completion. ERP analysis assessed early sensory processing (P50, ∼50 ms latency; N100, ∼100 ms latency), cognitive control (N200, ∼200 ms latency), and attentional processing (P3a and P3b, ∼300 ms latency). Behavioral data demonstrates participants with ASD and neurotypical performed similarly on auditory target detection, but diverged on sensory profiles. Target ERP measures associated with top-down control (P3b latency) significantly increased under greater load in controls, but not in participants with ASD. Early ERP responses associated with bottom-up attention (P50 amplitude) were positively correlated to increased sensory sensitivity. Findings suggest specific neural mechanisms for increased perceptual capacity and enhanced bottom-up processing of sensory stimuli in people with autism. Results from participants with ASD are consistent with load theory and enhanced perceptual functioning. Autism Res 2016, 9: 1079-1092. © 2016 International Society for Autism Research, Wiley Periodicals, Inc.
Autism research : official journal of the International Society for Autism Research, 2016 · doi:10.1002/aur.1593