A three-level model explains the emergence and maintenance of rhythmic stereotypy and self-injury in disabled individuals: Level 1, internally regulated rhythmic behaviors; Level 2, stereotypy and self-injury as adaptive responses to understimulating or overstimulating environments; and Level 3, stereotypy and self-injury as learned behaviors to…

This book, on the nature and problems of inappropriate drug use by older adults, provides researchers and health practitioners with an up-to-date survey and overview of the literature on drug use, misuse, and abuse among the elderly. The volume provides abstracts of 100 selected scientific articles on the major topic areas in the field. The…

Even though attrition presents a serious threat to the validity of longitudinal research, there is a lack of standardization for reporting it. To examine the effectiveness of four tests for attrition -- two for external validity and two for internal validity -- the tests were applied to two large scale projects: the first, Project HASP, is a…