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Max Wertheimer, the chief founder of an experimentally based Gestalt psychology, conducted his pioneering studies in motion perception on new theoretical grounds. Since the influence of this approach may be greater in today's cognitive psychology than it has ever been during the half-century of introspectionism and radical behaviorism, it is appropriate to review the actual roots of Wertheimer's (1912) seminal publication and his continuing research on apparent and real motion perception in the light of past and recent work. Illustrative examples, especially of Wertheimer's early research, are provided in this paper. The implications of his experimentation and biopsychological theorizing are still of major interest for present psychological inquiry. Nevertheless, the need for more future systematic comparative research on motion perception must be emphasized. The Epilogue of this paper examines why important parts of Wertheimer's experimental contributions to psychology may have been underrated or neglected by many contemporary psychologists.

This essay summarizes the four careers of George and Louise Spindler over a 50-year period—psychological anthropology, anthropology and education, teaching, and editing. Our relations with Indian tribes with which we worked are described. Special attention is given to illusions affecting the construction of education in American schools, to the use of projective techniques in studies among Native American communitites, and to studies in urbanizing German villages. The concept of cultural therapy is introduced. Publications from each of our four careers are sampled. [ABSTRACT FROM AUTHOR]