Comparison of Electrical and Ultrasound Neurostimulation in Rat Motor Cortex.

Authors: Gulick DW, Li T, Kleim JA, Towe BC

Ultrasound (US) is known to non-invasively stimulate and modulate brain function; however, the mechanism of action is poorly understood. This study tested US stimulation of rat motor cortex (100 W/cm<sup>2</sup>, 200 kHz) in combination with epidural cortical stimulation. US directly evoked hindlimb movement. This response occurred even with short US bursts (3 ms) and had short latency (10 ms) and long refractory (3 s) periods. Unexpectedly, the epidural cortical stimulation hindlimb response was not altered during the 3-s refractory period of the US hindlimb response. This finding suggests that the US refractory period is not a general suppression of motor cortex, but rather the recovery time of a US-specific mechanism.

Introduction

Purpose Transcranial ultrasound stimulation (TUS)

Study Objective To compare the effects of electrical versus ultrasound neurostimulation on the rat motor cortex.

Animal model / Human subject Rat (Rattus norvegicus), strain not specified, age not specified, sex not specified

Disease model Healthy

Targeted brain region(s) Rat Motor Cortex

Outcomes and Safety

Summary of Outcomes No experimental details were provided in the supplied text, so the main biological or behavioral effects and any successful focused ultrasound parameters cannot be determined.

Safety-related matter The provided text contains no mention of safety or adverse effects.

Brain Region

Ultrasound Parameters

Focal Characteristics Focal depth: None; Focal length: None; Aperture size: None

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