No Differences in Auditory Steady-State Responses in Children with Autism Spectrum Disorder and Typically Developing...

Area of Science:

• Neuroscience
• Developmental Psychology
• Biomarker Research

Background:

• Auditory steady-state response (ASSR) is explored as a potential biomarker for auditory sensory processing differences in autism spectrum disorder (ASD).
• Previous research noted inter-trial coherence (ITC) differences in somatosensory responses at double stimulation frequencies between ASD and typically developing (TD) individuals.
• These findings prompted an investigation into similar auditory responses.

Purpose of the Study:

• To investigate auditory steady-state responses (ASSR) at stimulation and double frequencies in children with and without autism spectrum disorder (ASD).
• To determine if ASSR, particularly inter-trial coherence (ITC) at double frequencies, could serve as a robust biomarker for abnormal auditory processing in ASD.
• To assess the generalizability of previously observed atypical double-frequency somatosensory responses in ASD to the auditory modality.

Main Methods:

• Magnetoencephalography (MEG) was used to record auditory steady-state responses (ASSR).
• Participants included 22 children with ASD and 31 typically developing (TD) children, aged 6-17 years.
• ASSRs were measured at 25 Hz, 50 Hz, 43 Hz, and 86 Hz in response to 25 Hz and 43 Hz auditory stimuli.

Main Results:

• Prominent ASSRs were observed at both the auditory stimulation frequency and the double frequency.
• No significant group differences in inter-trial coherence (ITC) were found between children with ASD and TD children at either the stimulation or double frequencies.
• The previously observed atypical double-frequency somatosensory response in ASD did not generalize to the auditory modality.

Conclusions:

• Auditory steady-state response (ASSR) does not appear to be a robust biomarker for abnormal auditory processing in autism spectrum disorder (ASD).
• The findings do not support the hypothesis of modality-independent abnormal local connectivity in ASD.
• Further research is needed to understand auditory processing differences in ASD.