Two experiments examined role of affective correspondence between signal and outcome in 4-month olds' associative learning. Found that only when consoling infant-directed speech signaled the sad face did infants' visual interest in a checkerboard increase. Arousing infant-directed speech signaling either the smiling or sad face produced positive…

Three related experiments were conducted to investigate the effects of novel and familiar stimuli on infant attention. The procedure in each of the experiments was to place an infant before a matrix panel composed of six rows of six lights. Two patterns of lights were used to obtain the infants' fixation time: (1) a point pattern, a single…

The purpose of this study was to cross-sectionally and longitudinally examine the developmental process of search behavior in infancy. Subjects were 23 Japanese normal infants (11 males and 12 females) who were individually tested once a month from the age of six to 13 months in laboratory settings. Small toys and three white opaque cubic boxes…