Autistic Listeners Demonstrate Robust Lexically Guided Perceptual Learning.

Researchers tested whether autistic people process speech sounds differently than non-autistic people. Both groups listened to ambiguous sounds that could be heard as different letters (like 's' or 'sh') in different words. Both autistic and non-autistic listeners adapted their hearing in the same way, learning to interpret the sounds based on context. This suggests that basic speech processing abilities work similarly in autistic and non-autistic people.

This study examined whether autistic individuals adapt their speech perception differently than neurotypical listeners when exposed to ambiguous speech sounds. Eighty participants (40 autistic, 40 neurotypical) completed a perceptual learning task involving sounds that could be heard as either /s/ or /ʃ/ in different word contexts. Both groups showed robust learning, adapting their perception based on lexical context. Importantly, the degree of learning was not associated with autistic traits or pitch pattern sensitivity.

These findings suggest that fundamental speech perception adaptation mechanisms are preserved in autism, challenging assumptions that social language differences in autism necessarily impact core auditory processing abilities.

Results suggest that speech perception adaptation mechanisms are intact in autism, which may inform therapeutic approaches focusing on higher-level language processing rather than basic auditory skills. This could guide more targeted interventions for communication difficulties.

The abstract does not specify participant characteristics, control for potential confounding variables, or discuss generalizability beyond the specific phonetic contrasts tested. Long-term retention of learning effects was not assessed.

Listeners accommodate rampant variability in speech input, at least in part, by adapting to structured phonetic variation. However, most work demonstrating this type of perceptual learning has focused on group-level effects in modal populations. This approach masks potentially meaningful differences-present among all listeners but particularly associated with autism-in sensory perception, social functioning, and language processing. These differences may be expected to influence adaptation, but their roles remain unclear.

The present investigation aimed to clarify the relationships between autism, perceptual acuity, and adaptation. Listeners (n = 80, of which 40 were diagnosed with autism) were exposed to spectral energy ambiguous between /s/ and /ʃ/ in lexical contexts designed to elicit adaptation. Learning was assessed by comparing categorization of an ashi-asi test continuum before and after the critical lexically guided exposure. Autistic traits and pitch pattern sensitivity were also assessed.

Robust learning was observed by both the general population and autistic listeners, with no evidence to suggest that learning was associated with autistic traits or pitch pattern sensitivity. These results advance theories of speech adaptation by constraining determinants of lexically guided perceptual learning to suggest that the social language traits of autism may be orthogonal to adaptation in speech perception.