期刊
BRAIN CONNECTIVITY
卷 7, 期 9, 页码 558-573出版社
MARY ANN LIEBERT, INC
DOI: 10.1089/brain.2016.0483
关键词
autism spectrum disorder; default mode network; resting-state fMRI
资金
- Alan and Lorraine Bressler Clinical and Research Program for Autism Spectrum Disorder
- Saylor Family Fund for Autism Research
- MGH Pediatric Psychopharmacology Council Fund
- National Institute of Mental Health [K23MH100450]
The aim of this study is to assess the resting-state functional connectivity (RsFc) profile of the default mode network (DMN) in transition-age males with autism spectrum disorder (ASD). Resting-state blood oxygen level-dependent functional magnetic resonance imaging data were acquired from adolescent and young adult males with high-functioning ASD (n=15) and from age-, sex-, and intelligence quotient-matched healthy controls (HCs; n=16). The DMN was examined by assessing the positive and negative RsFc correlations of an average of the literature-based conceptualized major DMN nodes (medial prefrontal cortex [mPFC], posterior cingulate cortex, bilateral angular, and inferior temporal gyrus regions). RsFc data analysis was performed using a seed-driven approach. ASD was characterized by an altered pattern of RsFc in the DMN. The ASD group exhibited a weaker pattern of intra- and extra-DMN-positive and -negative RsFc correlations, respectively. In ASD, the strength of intra-DMN coupling was significantly reduced with the mPFC and the bilateral angular gyrus regions. In addition, the polarity of the extra-DMN correlation with the right hemispheric task-positive regions of fusiform gyrus and supramarginal gyrus was reversed from typically negative to positive in the ASD group. A wide variability was observed in the presentation of the RsFc profile of the DMN in both HC and ASD groups that revealed a distinct pattern of subgrouping using pattern recognition analyses. These findings imply that the functional architecture profile of the DMN is altered in ASD with weaker than expected integration and segregation of DMN RsFc. Future studies with larger sample sizes are warranted.
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