Perturbation of Japanese mother-infant habitual interactions in the double video paradigm and relationship to maternal playfulness 論文 Shigeru Nakano・Kiyomi Kondo‐Ikemura・Emiko Kusanagi ·2007-03-27 ·『Infant Behavior and Development』 30(2) pp. 213-231 doi:10.1016/j.infbeh.2007.02.005