Time-varying spectral power of resting-state fMRI networks reveal cross-frequency dependence in dynamic connectivity.

ABSTRACT: Brain oscillations and synchronicity among brain regions (brain connectivity) have been studied in resting-state (RS) and task-induced settings. RS-connectivity which captures brain functional integration during an unconstrained state is shown to vary with the frequency of oscillations. Indeed, high temporal resolution modalities have demonstrated both between and cross-frequency connectivity spanning across frequency bands such as theta and gamma. Despite high spatial resolution, functional magnetic resonance imaging (fMRI) suffers from low temporal resolution due to modulation with slow-varying hemodynamic response function (HRF) and also relatively low sampling rate. This limits the range of detectable frequency bands in fMRI and consequently there has been no evidence of cross-frequenc

SUBMITTER: Yaesoubi M 

PROVIDER: S-EPMC5305250 | biostudies-literature | 2017

REPOSITORIES: biostudies-literature