Attenuated processing of vowels in the left temporal cortex predicts speech-in-noise perception deficit in children with autism.

This brain imaging study found that children with autism have differences in how their brains process vowel sounds, particularly in the left side of the brain. These brain differences were linked to difficulties understanding words when there's background noise that goes up and down (like in a busy restaurant). However, children with autism didn't have extra trouble with steady background noise. This helps explain why many children with autism struggle to follow conversations in noisy environments.

This magnetoencephalography (MEG) study investigated neural processing of vowels and speech-in-noise perception in boys with autism spectrum disorder (ASD). Researchers found that children with ASD showed reduced sustained processing negativity (SPN) when processing vowel formant structure, particularly in left temporal cortex regions around 150-200ms after sound onset. This neural deficit correlated with impaired ability to recognize words in amplitude-modulated noise, but not stationary noise. The findings suggest that perceptual grouping of vowel formants into phonemes is impaired in children with ASD, and this deficit specifically contributes to difficulties understanding speech in fluctuating background noise environments.

Findings suggest children with ASD may benefit from interventions targeting speech perception in fluctuating noise environments specifically. Therapeutic approaches could focus on phoneme discrimination training and acoustic processing skills. Environmental modifications to reduce amplitude-modulated background noise may improve speech comprehension in educational and clinical settings.

Sample size not reported in abstract. Study limited to boys only, limiting generalizability to girls with ASD. Cross-sectional design prevents determination of causality. MEG methodology requires specialized equipment and expertise, limiting clinical applicability of assessment approach.

Difficulties with speech-in-noise perception in autism spectrum disorders (ASD) may be associated with impaired analysis of speech sounds, such as vowels, which represent the fundamental phoneme constituents of human speech. Vowels elicit early (< 100 ms) sustained processing negativity (SPN) in the auditory cortex that reflects the detection of an acoustic pattern based on the presence of formant structure and/or periodic envelope information (f0) and its transformation into an auditory "object". We used magnetoencephalography (MEG) and individual brain models to investigate whether SPN is altered in children with ASD and whether this deficit is associated with impairment in their ability to perceive speech in the background of noise. MEG was recorded while boys with ASD and typically developing boys passively listened to sounds that differed in the presence/absence of f0 periodicity and formant structure.

Word-in-noise perception was assessed in the separate psychoacoustic experiment using stationary and amplitude modulated noise with varying signal-to-noise ratio. SPN was present in both groups with similarly early onset. In children with ASD, SPN associated with processing formant structure was reduced predominantly in the cortical areas lateral to and medial to the primary auditory cortex, starting at ~ 150-200 ms after the stimulus onset. In the left hemisphere, this deficit correlated with impaired ability of children with ASD to recognize words in amplitude-modulated noise, but not in stationary noise.

These results suggest that perceptual grouping of vowel formants into phonemes is impaired in children with ASD and that, in the left hemisphere, this deficit contributes to their difficulties with speech perception in fluctuating background noise.