Examined developmental changes in the use of distance-based and calendar-based approaches to estimate the recency of two events. Found that children's ability to discriminate temporal relationships between two events appears by four to five years of age. In contrast, use of calendar information and cognizance of annual patterns was found only in…

Observations and interviews of 20 middle-class preschoolers and their mothers were conducted to examine the emergence of the personal domain. Found that preschoolers make a conceptual distinction between personal and moral or conventional issues, and that mothers were more likely to negotiate with children over personal than social events. (MDM)

Explored sex differences in adolescent preference for older versus younger mates. Found that teenage males were willing to date females of a wide age range, whereas teenage females prefer dating males from their own age to several years older. Data suggested viewing development of sex differences in dating partner preference from the perspective…