Attention-Dependent but not Pre-attentive Neural Markers of Auditory Change Process are Atypical in Adults With Autism Spectrum Conditions.
Autistic adults’ brains hear changes automatically, but the conscious ‘I notice’ signal is weak—plan tasks and assessments with this attention gap in mind.
01Research in Context
What this study did
Liu (2025) wired up autistic and non-autistic adults to EEG.
The team played streams of beeps. Some beeps changed pitch.
The adults watched a silent movie, so their attention was free to wander.
The test split the brain’s job in two: first, automatic detection of change; second, conscious noticing of change.
What they found
The early, automatic brain wave (MMN) looked the same in both groups.
The later, attention-needed wave (P3b) was smaller in autistic adults.
Theta power stayed normal; delta power dropped only when attention was required.
In plain words: the ear hears fine, but the mind tunes in less.
How this fits with other research
Lortie et al. (2017) saw the same split in autistic kids listening to human sounds. Their MMN was fine; their P3 was weak.
Panganiban et al. (2025) also found smaller P300 waves in autistic youth, and those smaller waves predicted slower daily skills.
Nijs et al. (2016) mixed attention load and got messy ERPs. Liu (2025) used a cleaner hierarchy and shows the problem is truly the attention step, not every step.
Adams et al. (2024) add a twist: they caught slower early waves (N1) too. The studies don’t fight—Peipei shows later-stage loss, E et al. show earlier-stage drag. Together they map a cascade of small auditory timing hits.
Why it matters
When you test auditory skills, know the client may pass basic hearing screens yet still struggle once focus is needed. Give extra wait time, visual cues, or repeat instructions. Avoid noisy rooms for assessments that lean on listening. If you use EEG as a bio-marker, look at P3b, not just MMN, to flag real-world attention risk.
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02At a glance
03Original abstract
PURPOSE: Efficiently processing auditory changes in dynamic environments is essential for adaptive functioning. Although individuals with Autism Spectrum Conditions (ASC) often exhibit atypical sensory profiles, the neural mechanisms underlying auditory change processing remain inconclusive. This study investigated neural dynamics in ASC at two distinct stages: the pre-attentive stage and the attention-dependent stage. METHODS: Using the local-global paradigm with non-speech complex sounds, we examined hierarchical auditory change processing in 20 autistic and 21 non-autistic adults. This paradigm enables the dissociation of pre-attentive and attention-dependent stages by manipulating local (short-timescale) and global (long-timescale) auditory regularities. Local-level changes elicited the MMN, reflecting pre-attentive processing, whereas global-level changes elicited the P3b, indexing attention-dependent contextual updating. In addition to event-related potentials (ERPs), we examined time-frequency representations (TFRs) to assess theta- and delta-band oscillations linked to memory and attentional processes. RESULTS: At the local level, ASC individuals showed comparable MMN amplitudes and frontocentral theta oscillations compared to non-autistic individuals, suggesting preserved pre-attentive mechanisms. At the global level, they exhibited reduced P3b amplitude and decreased delta activity, indicating altered attention-dependent processing. CONCLUSION: These findings reveal a stage-specific dissociation in auditory change processing in autism, with selective alterations in attention-dependent neural responses requiring sustained attention and contextual updating. Beyond their theoretical significance, these alterations may serve as candidate neurophysiological markers of attention-related atypicalities in ASC, with potential applications in educational practices and cognitive assessments in attentionally demanding contexts.
Journal of autism and developmental disorders, 2025 · doi:10.1097/00001756-200004070-00038