The purpose of this study is to examine the functional and structural modification effects on the brain of a non-invasive experimental device applied to the head and forearms of healthy subjects during motor recall training. The experimental device used in this study is the Brain-Machine Interface (hereinafter referred to as BMI), which is under development in the principal investigator's laboratory. The BMI consists of an arithmetic unit that processes the results in real time using a personal computer, a depth ray that displays the results, a transcutaneous electrical stimulator that is driven based on the results of the arithmetic, and an exoskeletal motor assist device that is driven based on the results of the arithmetic.

This study does not fall under the category of 'medical research involving human subjects' or 'clinical research subject to legal regulations' in Japan, and the appointment of a principal investigator (PI) is not required. For the convenience of registry submission, the name of the principal investigator field has been filled with the name of the study representative (a non-physician).

Exclusion Criteria:

• History of neurological disorder