  Touch is the first sense among human senses. Not only that, but it is also
one of the most important senses that are indispensable. However, compared to
sight and hearing, it is often neglected. In particular, since humans use the
tactile sense of the skin to recognize and manipulate objects, without tactile
sensation, it is very difficult to recognize or skillfully manipulate objects.
In addition, the importance and interest of haptic technology related to touch
are increasing with the development of technologies such as VR and AR in recent
years. So far, the focus is only on haptic technology based on mechanical
devices. Especially, there are not many studies on tactile sensation in the
field of brain-computer interface based on EEG. There have been some studies
that measured the surface roughness of artificial structures in relation to
EEG-based tactile sensation. However, most studies have used passive contact
methods in which the object moves, while the human subject remains still.
Additionally, there have been no EEG-based tactile studies of active skin
touch. In reality, we directly move our hands to feel the sense of touch.
Therefore, as a preliminary study for our future research, we collected EEG
signals for tactile sensation upon skin touch based on active touch and
compared and analyzed differences in brain changes during touch and movement
tasks. Through time-frequency analysis and statistical analysis, significant
differences in power changes in alpha, beta, gamma, and high-gamma regions were
observed. In addition, major spatial differences were observed in the
sensory-motor region of the brain.
