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Abstract #4969

Effects of MRI acoustic noise on resting state functional connectivity

Keigo Hikishima1,2, Tomokazu Tsurugizawa1, Kazumi Kasahara1, Ryusuke Hayashi1, Ryo Takagi1, Kiyoshi Yoshinaka1, and Naotaka Nitta1
1National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan, 2Okinawa Institute of Science and Technology Graduate University, Onna, Japan

Synopsis

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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Keywords

acousticnoiseauditorynetwork