Many research findings about animal play apply to children's play, revealing structural and functional similarities with mammals in general and primates in particular. After an introduction to life-history theory, and before turning to humans, the author reviews research about the two mammals in which play has been studied the most extensively:…

Goods remote in temporal, spatial, or social distance, or in likelihood, exert less control over our behavior than those more proximate. The decay of influence with distance, of perennial interest to behavioral economists, has had a renaissance in the study of delay discounting. By developing discount functions from marginal utilities, this…

This study examined the use of a progressive delay procedure with and without a concurrent activity to teach self-control to children with attention deficit hyperactivity disorder. Three participants were initially required to wait progressively longer periods of time for access to preferred edible reinforcers. After demonstrating this…

Conclusions about secondary control have been hindered by researchers' disparate interpretations of the construct. The current review offers a definition that reflects commonality among researchers and the spirit of the original article (F. Rothbaum, J. R. Weisz, & S. S. Snyder, 1982): Secondary control refers to the process by which people adjust…