Summarizes the diagnostic evaluation of one prepubescent male with the double Y syndrome and suggests a need to investigate further the biochemical, physiological, and genetic roles underlying such gross behavioral abnormalities. (WY)

Reports on a strategy of continuous measurement of the frequency of the same infant behavior over time, which was applied to measuring infant development in the prone position, namely, chin lifting, chest lifting, and a creeping response. (BD/BR)

The use of assisted reproductive technology is increasing rapidly. Research, although sparse, has resulted in inconsistent findings as to the developmental prognosis for infants conceived by assisted reproductive techniques such as in vitro fertilization and the use of fertility drugs. In the present study, the authors compared twins who were…

The present study was designed to assess the preschool's contribution to the social, physical, and cognitive development of children in a normal, upper-middle socioeconomic level community. (BD)