Discrimination and Integration of Phonological Features in Children with Autism Spectrum Disorder: An Exploratory...

Area of Science:

• Neuroscience
• Developmental Psychology
• Linguistics

Background:

• Children with Autism Spectrum Disorder (ASD) exhibit hypersensitivity to simple sounds but struggle with complex auditory-discriminating multiple phonological features.
• These difficulties in processing segmental (consonants, vowels) and suprasegmental (tones) speech features at the syllable level impede communication in ASD.
• Understanding the neural underpinnings of these challenges is crucial, especially in tonal languages like Mandarin.

Purpose of the Study:

• To investigate the neural basis of segmental, suprasegmental, and combinatorial speech processing in Mandarin-speaking children with ASD compared to typically developing (TD) peers.
• To explore how cognitive biases (e.g., local vs. global processing) and speech-specific neurophysiological disruptions contribute to communication difficulties in ASD.

Main Methods:

• A multi-feature oddball paradigm was used with thirty children with ASD and thirty TD peers during passive listening to elicit auditory event-related potentials (ERPs).
• Stimuli included syllables with single, dual, and triple phonological deviations (vowel, tone, consonant+vowel+tone).
• Temporal principal component analysis (t-PCA) and representational similarity analysis (RSA) were employed to analyze neural responses and group differences.

Main Results:

• Hypothesized attenuated or delayed neural responses in ASD children to suprasegmental and multi-feature deviants, with the most disruption in complex conditions.
• Expected reduced mismatch negativity (MMN) amplitudes and prolonged latencies in ASD across all speech features, particularly in complex multi-feature conditions.
• Anticipated a diminished left-hemisphere advantage in neural processing for speech features in children with ASD.

Conclusions:

• This study will differentiate between cognitive biases and speech-specific neurophysiological disruptions in ASD's auditory processing.
• Findings will enhance understanding of sensory and integrative mechanisms behind communication challenges in ASD, particularly in tonal language environments.
• Results may inform the development of targeted, linguistically appropriate interventions for children with ASD.