Functional magnetic resonance imaging (fMRI) studies have suggested that neural variability and connectivity (temporal coherence) are generally reduced during active versus passive (or resting) brain states. In this study, we investigate if this reduction in brain coherence is a supra-modal or modality-specific effect. For that, we compared BOLD signal during rest and whilst performing a continuous auditory or visual task. Our results suggest that task-induced reduction in brain coherence occurs only in default-mode and hetero-modal brain regions.
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