Stimulus over-selectivity is said to have occurred when only a limited subset of the total number of stimuli present during discrimination learning controls behavior, thus, restricting learning about the range, breadth, or all features of a stimulus. The current study investigated over-selectivity of 100 typically developing children, aged 3-7…

Sensitivity to spacing information within faces improves with age and reaches maturity only at adolescence. In this study, we tested 6-16-year-old children's sensitivity to vertical spacing when the eyes or the mouth is the facial feature selectively manipulated. Despite the similar discriminability of these manipulations when they are embedded in…

Moderate, yet relatively consistent, associations between cognitive performance and shyness have been reported throughout the child and adult literatures. The current study assessed longitudinal associations between cognition (i.e., executive functioning) and parent-report temperamental shyness from infancy to early childhood and used temporal…

Cognitive activity of children from 1.5 to 5 years of age participating in problem solving and in spontaneous play was analyzed in terms of the successive coordination of existing patterns and the incorporation of new mental components. Analysis identified a series of developmental levels. (Author/RH)

During toddlerhood the ability to organise actions for accomplishing goals rapidly increases. The developmental changes in actions and self-process that become part of this motivational system have seldom been studied simultaneously. Fifty-seven toddlers between the ages of 15 and 35 months were observed for two sessions while working on mastery…