Keywords: Functional Connectivity, Brain Connectivity, MRI acoustic noise
Motivation: Loud acoustic noise during resting state fMRI can affect functional connectivity (FC), but the precise effect of MRI acoustic noise on FC is not well understood.
Goal(s): To clarify the impact of MRI acoustic noise on FC.
Approach: FC in mice under MRI acoustic noise was investigated using functional ultrasound (fUS), a functional imaging method based on relative cerebral blood volume, and the FC obtained was compared with FC by fMRI.
Results: As acoustic noise increased, in the auditory network FC between the retrosplenial dysgranular and auditory cortexes decreased, while in the non-auditory network FC anticorrelation between the infralimbic and motor cortexes increased.
Impact: Anticorrelation between the default mode network (e.g., infralimbic cortex) and task-positive networks (e.g., motor cortex) is an important feature of brain network antagonism. Attention should be paid to the acoustic noise level when fMRI to evaluate anticorrelation of such networks.
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