This study investigated at the age at which infants become able to discriminate between their mothers and females strangers, as measured by differential patterns of pauses during the infants' crying while being spoken to by their mothers and female strangers. The subjects, 14 infants ranging in age from 7 to 20 days, were fed, burped, and changed,…

Ninety-eight first grade children were observed and tested on measures of classroom behavior, task performance, and physiological arousal level. In general, sex differences were found to be minimal, and were significant on only three out of the eighteen variables investigated. Results indicated that males were rated by teachers and observers as…