Reviews research on infants classified by Ainsworth's "Strange Situation" assessment as insecure/ambivalent, and examines studies exploring attachment theory beyond infancy. Presents a theoretical discussion of the ways in which patterns of mother and child behaviors associated with the insecure/ambivalent pattern may work together to…

Argues that an evolutionary perspective can unite the study of species-typical development and individual variation. Provides examples from the domains of personality, social, and intellectual development. Maintains that understanding the ways in which genes and environments work together helps developmentalists identify children who need…