W. David Pierce is Professor, Emeritus, of Sociology at the University of Alberta, Canada. He has investigated a biobehavioral model of activity anorexia, exercise-induced taste aversion, and behavioral-neurometabolic determinants of obesity. Currently, his research is focused on wheel-running reinforcement, the response deprivation hypothesis, and extensions of behavioral momentum theory. ... Read moreCarl D. Cheney is Professor, Emeritus, of Psychology at Utah State University, USA. He taught behavior analysis and physiological psychology, and published widely in the experimental analysis of behavior-conducting basic analyses of predator-prey interactions, diet selection in domestic livestock, as well as reinforcement-schedule alterations and transitions in humans. His current research is focused on encouraging the wider use of behavior analysis in all appropriate situations. Show Less