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Front Hum Neurosci. 2020 Feb 28;14:52. doi: 10.3389/fnhum.2020.00052. eCollection 2020.

Transcranial Focused Ultrasound to the Right Prefrontal Cortex Improves Mood and Alters Functional Connectivity in Humans.

Author information

1
Department of Psychology, University of Arizona, Tucson, AZ, United States.
2
Center for Consciousness Studies, University of Arizona, Tucson, AZ, United States.
3
Department of Psychology, The University of New Mexico, Albuquerque, NM, United States.
4
Department of Anesthesiology, University of Arizona, Tucson, AZ, United States.
5
New York State Psychiatric Institute, New York, NY, United States.
6
The Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, United States.
7
River Sonic Solutions LLC, San Francisco, CA, United States.
8
School of Biological and Health Systems Engineering, Arizona State University, Tempe, AZ, United States.

Abstract

Transcranial focused ultrasound (tFUS) is an emerging method for non-invasive neuromodulation akin to transcranial magnetic stimulation (TMS) and transcranial direct current stimulation (tDCS). tFUS offers several advantages over electromagnetic methods including high spatial resolution and the ability to reach deep brain targets. Here we describe two experiments assessing whether tFUS could modulate mood in healthy human volunteers by targeting the right inferior frontal gyrus (rIFG), an area implicated in mood and emotional regulation. In a randomized, placebo-controlled, double-blind study, participants received 30 s of 500 kHz tFUS or a placebo control. Visual Analog Mood Scales (VAMS) assessed mood four times within an hour (baseline and three times after tFUS). Participants who received tFUS reported an overall increase in Global Affect (GA), an aggregate score from the VAMS scale, indicating a positive shift in mood. Experiment 2 examined resting-state functional (FC) connectivity using functional magnetic resonance imaging (fMRI) following 2 min of 500 kHz tFUS at the rIFG. As in Experiment 1, tFUS enhanced self-reported mood states and also decreased FC in resting state networks related to emotion and mood regulation. These results suggest that tFUS can be used to modulate mood and emotional regulation networks in the prefrontal cortex.

KEYWORDS:

brain stimulation; functional connectivity; mood; neuromodulation; transcranial focused ultrasound

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