Postural Sway Response to Local Vibratory Stimulation in Young, Middle-aged and Elderly People in Standing Position. - Ayaka Yamada; Eishi Nakamura; Noritaka Sato; Yoshifumi Morita; Tadashi Ito; Yoshihito Sakai; Kazunori Yamazaki (J. Robotics Netw. Artif. Life, 2015)