Melissa Kirkovski1,2, Nigel C Rogasch2,3, Takashi Saeki2,4, Bernadette M Fitzgibbon2, Peter G Enticott1,2, Paul B Fitzgerald2. 1. 1 Cognitive Neuroscience Unit, School of Psychology, Deakin University , Geelong, Australia . 2. 2 Monash Alfred Psychiatry Research Centre, The Alfred and Central Clinical School, Monash University , Clayton, Australia . 3. 3 Monash Clinical and Imaging Neuroscience, School of Psychological Sciences and Monash Biomedical Imaging, Monash University , Clayton, Australia . 4. 4 Department of Psychiatry, Yokohama City University School of Medicine , Yokohama, Japan .
Abstract
OBJECTIVE: Neuroimaging and electrophysiological research have revealed a range of neural abnormalities in autism spectrum disorder (ASD), but a comprehensive understanding remains elusive. We utilized a novel methodology among individuals with ASD and matched controls, combining transcranial magnetic stimulation (TMS) with concurrent electroencephalogram (EEG) recording (TMS-EEG) to explore cortical function and connectivity in three sites implicated in the neuropathophysiology of ASD (dorsolateral prefrontal cortex, primary motor cortex, and temporoparietal junction). As there is evidence for neurobiological gender differences in ASD, we also examined the influence of biological sex. METHODS: TMS pulses were applied to each of the three sites (right lateralized) during 20-channel EEG recording. RESULTS: We did not identify any differences in the EEG response to TMS between ASD and control groups. This finding remained when data were stratified by sex. Nevertheless, traits and characteristics associated with ASD were correlated with the neurophysiological response to TMS. CONCLUSION: While TMS-EEG did not appear to clarify the neuropathophysiology of ASD, the relationships identified between the neurophysiological response to TMS and clinical characteristics warrant further investigation.
OBJECTIVE: Neuroimaging and electrophysiological research have revealed a range of neural abnormalities in autism spectrum disorder (ASD), but a comprehensive understanding remains elusive. We utilized a novel methodology among individuals with ASD and matched controls, combining transcranial magnetic stimulation (TMS) with concurrent electroencephalogram (EEG) recording (TMS-EEG) to explore cortical function and connectivity in three sites implicated in the neuropathophysiology of ASD (dorsolateral prefrontal cortex, primary motor cortex, and temporoparietal junction). As there is evidence for neurobiological gender differences in ASD, we also examined the influence of biological sex. METHODS: TMS pulses were applied to each of the three sites (right lateralized) during 20-channel EEG recording. RESULTS: We did not identify any differences in the EEG response to TMS between ASD and control groups. This finding remained when data were stratified by sex. Nevertheless, traits and characteristics associated with ASD were correlated with the neurophysiological response to TMS. CONCLUSION: While TMS-EEG did not appear to clarify the neuropathophysiology of ASD, the relationships identified between the neurophysiological response to TMS and clinical characteristics warrant further investigation.
Authors: Peter G Enticott; Karen Barlow; Adam J Guastella; Melissa K Licari; Nigel C Rogasch; Christel M Middeldorp; Scott R Clark; Ann-Maree Vallence; Kelsie A Boulton; Ian B Hickie; Andrew J O Whitehouse; Cherrie Galletly; Gail A Alvares; Hakuei Fujiyama; Helen Heussler; Jeffrey M Craig; Melissa Kirkovski; Natalie T Mills; Nicole J Rinehart; Peter H Donaldson; Talitha C Ford; Karen Caeyenberghs; Natalia Albein-Urios; Soukayna Bekkali; Paul B Fitzgerald Journal: BMJ Open Date: 2021-07-07 Impact factor: 2.692