Previously unacquainted groups of normally developing and mildly developmentally delayed preschool-age boys (N = 64) were brought together to form a series of 8 mainstreamed playgroups. Each playgroup consisted of 3 normally developing 3-year-olds, 3 normally developing 4-year-olds, and 2 mildly developmentally delayed 4-year-olds. The delayed children were matched with the normally developing ...

OBJECTIVE Most studies of population aging focus on only one characteristic of people: their chronological age. Many important characteristics of people vary with age, but age-specific characteristics also vary over time and differ from place to place. We supplement traditional measures of aging with new ones that consider the changing characteristics of people. METHOD The characteristics app...

Adolescence refers to the period of physical and psychological development between childhood and adulthood. The beginning of adolescence is loosely anchored to the onset of puberty, which brings dramatic alterations in hormone levels and a number of consequent physical changes. Puberty onset is also associated with profound changes in drives, motivations, psychology, and social life; these chan...

Relative age effects (RAEs) refer to consequences of differences in chronological age among individuals within age-grouped cohorts. RAEs advantage relatively older players and have consistently been found in male ice hockey, but research in women’s ice hockey is scarce. This study examined RAEs in Swedish women’s elite (N = 688) and junior elite (N = 399) ice hockey and a moderator of RAEs, pla...

INTRODUCTION Observations of behaviour and research using eyetracking technology have shown that individuals with Williams syndrome (WS) pay an unusual amount of attention to other people's faces. The present research examines whether this attention to faces is moderated by the valence of emotional expression. METHOD Sixteen participants with WS aged between 13 and 29 years (mean = 19 years 9...

Young children typically demonstrate a transfer deficit, learning less from video than live presentations. Semantically meaningful context has been demonstrated to enhance learning in young children. We examined the effect of a semantically meaningful context on toddlers' imitation performance. Two- and 2.5-year-olds participated in a puzzle imitation task to examine learning from either a live...

This study tested three hypotheses derived from the application of socioemotional selectivity theory and exchange theory to the exchange of emotional support with age and its relationship with positive and negative affect by age. Data are from the Midlife in the United States study of 3,032 U.S. adults between the ages of 25 and 74. The social contact hypothesis predicts that hours of emotional...

The current study examined the effects of two manipulations on equal and expanded spaced retrieval schedules in young and older adults. First, we examined the role that the type of expansion (systematic vs. nonsystematic) has in producing a benefit of expanded retrieval. Second, we examined the influence of an immediate retrieval attempt to minimize forgetting after the original encoding event....

This article examines 14-year longitudinal data and attempts to create a post hoc model that uses Time-1 data to "predict" the length of time the marriage will last. The sample consists of the 21 couples (of 79 studied) who divorced over a 14-year period. A two-factor model is proposed. One factor is the amount of unregulated volatile positive and negative affect in the marriage, and this facto...