Neural Substrates of Human Facial Expression of Pleasant Emotion Induced by Comic Films: A PET Study. - Masao Iwase; Yasuomi Ouchi; Hiroyuki Okada; Chihiro Yokoyama; Shuji Nobezawa; Etsuji Yoshikawa; Hideo Tsukada; Masaki Takeda; Ko Yamashita; Masatoshi Takeda; Kouzi Yamaguti; Hirohiko Kuratsune; et al. (NeuroImage, 2002)