Implication of auditory confounding in interpreting somatosensory and motor responses in low-intensity focused transcranial ultrasound stimulation.

Authors: Park C, Chen M, Kim T

Low-intensity transcranial focused ultrasound (LI-tFUS) stimulation is a noninvasive neuromodulation tool that demonstrates high target localization accuracy and depth penetration. It has been shown to modulate activities in the primary motor and somatosensory cortex. Previous studies in animals as well as in humans, illustrated in the recently published paper in <i>Brain Stimulation</i> by Braun et al. [Braun V, Blackmore J, Cleveland RO, Butler CR. <i>Brain Stimul</i> 13: 1527-1534, 2020], acknowledged the possibility of indirect stimulation of the peripheral auditory pathway that could confound the somatosensory and motor responses observed with LI-tFUS stimulation. Here, we discuss the implications and interpretations of auditory confounding in the context of neuromodulation.

Introduction

Purpose Transcranial ultrasound stimulation

Study Objective To determine whether auditory confounds influence somatosensory and motor responses elicited by low-intensity focused transcranial ultrasound stimulation.

Outcomes and Safety

Summary of Outcomes Low‑intensity focused transcranial ultrasound produced somatosensory and motor responses that the authors attribute largely to auditory (cochlear) confounds rather than direct neuromodulation; no distinct ultrasound parameter variants were reported as specifically successful.

Safety-related matter No safety concerns or adverse effects are mentioned in the provided text (title only).

Brain Region

Visualization unavailable

Ultrasound Parameters

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

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