by Jeffrey Jensen Arnett and Jennifer Lynn Tanner (Eds.) Washington, DC: American Psychological Association, 2006. 341 pp. ISBN 1-59147-329-2. $79.95Reviewed by Judith L. Gibbons Brien K. Ashdown What do laboratory rats, men, and college students have in common? They have often been studied by psychologists as representatives of a larger group, such as nonhuman animals or people in general. More recently, psychologists have turned to studying the species-typical behavior of rats and the roles and behavior of men and boys with respect to their masculine gender. Likewise, college students have served psychologists as representatives of humanity in studies of cognition and social and emotional behavior, but they have been studied infrequently as occupying a distinct developmental period. With some notable exceptions (e.g., Perry, 1970/1999), studies of the development of college-age persons in their own right were scarce until 2000, when Jeffrey Jensen Arnett (2000) proposed a new developmental period. Arnett posited that in modern industrial societies there is a distinct interim between adolescence and adulthood (roughly ages 18 through 25). The term he coined for this period was
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