Abstract
Since the confidence of psychophysical experimental result depends on human subjects' mind, evaluation of concentration degree is important to enhance reliability of the experimental result. In this paper, we evaluate the concentration degree using brain machine interfaces such as electroencephalogram (EEG), near infrared spectroscopy (NIRS) and hemoencephalography (HEG). In our experiments, human subjects perform a small object manipulation task using limited visual information on a screen and a tactile mouse with or without tactile sensation. Among these three interfaces, NIRS provided the best evaluation for brain activity appeared by the object manipulation task.
