Reduced inter-subject functional connectivity during movies in autism: Replicability across cross-national fMRI datasets
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Background
Autism is a neurodevelopmental disorder characterized by repetitive behaviors and difficulties in social communication and interaction. Previous research has shown that these symptoms are linked to idiosyncratic behavioral and brain activity patterns while viewing natural social events in movies. This study aimed to investigate the replicability of brain activity idiosyncrasy in autistic individuals by comparing their inter-subject functional connectivity (ISFC) with that of neurotypical individuals.
Methods
We tested for ISFC differences between autism and neurotypical groups using functional magnetic resonance imaging (fMRI) data from two independent datasets from Germany (N neurotypical = 25, 7 Males, 18 Females; N autism = 22, 12 Males, 10 Females) and Finland (N neurotypical = 19, N autism = 18; All males). Participants watched short movie stimuli, and pairwise ISFCs were computed across 273 brain regions. Group differences were evaluated using subject-wise permutation tests for each dataset.
Results
In both datasets, the autism group showed lower ISFCs compared to the neurotypical group, specifically between visual regions (e.g., occipital gyrus, cuneus) and parietal regions (e.g., superior and inferior parietal lobules), as well as between visual regions and frontal regions (e.g., inferior frontal gyrus, precentral gyrus). ISFC was higher in the Finnish autism group in temporal regions associated with sound and speech processing.
Conclusions
The study confirmed the replicability of reduced ISFCs in autistic individuals during naturalistic movie-watching, especially between visual and parietal/frontal brain regions. These findings reinforce the utility of ISFC and naturalistic movie-watching paradigm in studying neural connectivity alterations in autism.
