Found that preschool children can form abstract concepts of left and right which are not bound to the specific training context: children were able to generalize to new figures and to new spatial locations. The nature of the preschool child's left-right judgments is discussed. (Author/RH)

Examined seven-month-old infants' perceptions of happy and fearful facial expressions. Infants could generalize discrimination of expressions across male and female faces if first familiarized with happy faces. Infants tended to look longer at fear faces than at happy faces. Preferential responding was not specific to any individual face.…

Three experiments investigated seven-month-old infants' ability to discriminate the facial expressions of happiness and fear. (CM)

Tests the effects of stimulus variability on overgeneralization and overdiscrimination errors in children and adults. The subjects (n=64), adults and five-, seven-, and nine-year-old children, participated in a visual discrimination task. (CM)

Infants were tested for recognition and discrimination of expressions. Ten-month olds familiar with a mix of happy and surprised expressions demonstrated generalized discrimination of positive affect. Only after seven months does dependence on the presence of expression-specific features for affect recognition and discrimination diminish. (BC)

An evaluation of selective generalization of habituation on the basis of meaningful categories of stimuli. Also explored are the sex differences in conceptual generalization of habituation. Subjects were 36 toddlers with a mean age of 40 months. (SDH)