A training device aims to indicate a targeted object to be gazed at by a trainee, then trainee's visual sight to the targeted object is obstructed. After a selected duration a hint is given to the trainee to execute command actions related to the targeted object. Through completeness degree of trainee's execution of the command actions trainee's stillness can be evaluated and trained. During measuring electrophysiological signals such as brainwaves, trainee's feedback command actions can serve as a basis for measurement of electrophysiological signals.
Apparatus and method for dynamic detection of electrophysiological signals for stillness feedback