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…

Nearly 700 junior and senior high school students in Japan were asked to rate 24 cooperative and competitive behaviors in terms of personal importance during 3 consecutive academic years. Factor analysis of the ratings revealed one general cooperation factor and three competition factors (nonacademic, academic, and group centered). The results are…

Two studies investigated behavioral problems in childhood. Study 1 longitudinally investigated similarities and differences in enuresis and nailbiting among Japanese and American children. Incidences of enuresis decreased as subjects' age increased. Socio-cultural and family tolerance were related to incidences of nailbiting. In Study 2, changes…

This paper presents the 1992 findings of a three-nation longitudinal study of the psychological effects of computer use during primary school. Results are based on an analysis of Likert-type ratings by 3,036 students in grades 1 through 3 at 21 elementary schools in Japan (1,236 students), the United States (1,072 students plus 247 Hispanic…