Abstract:
:Spontaneous fMRI fluctuations are organized in large-scale spatiotemporal structures, or resting-state networks (RSN). However, it is unknown how task performance affects RSN dynamics. We use MEG to measure slow (∼0.1 Hz) coherent fluctuations of band-limited power (BLP), a robust correlate of RSN, during rest and movie observation and compare them to fMRI-RSN. BLP correlation, especially in α band, dropped in multiple RSN during movie although overall topography was maintained. Variability of power correlation increased in visual occipital cortex, and transient decrements corresponded to scenes perceived as "event boundaries." Additionally, stronger task-dependent interactions developed between vision and language networks in θ and β bands, and default and language networks in γ band. The topography of fMRI connectivity and relative changes induced by the movie were well matched to MEG. We conclude that resting-state and task network interactions are clearly different in the frequency domain despite maintenance of underlying network topography.
journal_name
Neuronjournal_title
Neuronauthors
Betti V,Della Penna S,de Pasquale F,Mantini D,Marzetti L,Romani GL,Corbetta Mdoi
10.1016/j.neuron.2013.06.022subject
Has Abstractpub_date
2013-08-21 00:00:00pages
782-97issue
4eissn
0896-6273issn
1097-4199pii
S0896-6273(13)00538-2journal_volume
79pub_type
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