“…Similar to the neural mechanism of contra-lateral control from the brain to upper limbs, lower limbs are controlled by contralateral brain hemispheres although the regions controlling respective lower limbs are closer to the midline of the brain [9]. According to the previous investigations, we have known that power spectral densities (PSD) extracted from the EEG recordings under different walking conditions were different [10], [11], [12], hemispherical asymmetry in the PSD was differential between the walking condition with an exoskeleton and the walking condition without an exoskeleton [13], the PSD was suppressed during walking compared to the upright standing [14], and the correlative relationship between brain activity and muscular contraction of the lower limb [15] and so forth. These differences among walking conditions have been utilized as features, based on which different walking conditions were successfully classified [10], [16], [17].…”