Minnesota Symposia on Child Psychology: Volume 3 was first published in 1969.This is the third volume in the series which is based on papers from the annual Minnesota Symposia on Child Psychology, sponsored by the Institute of Child Development at the University of Minnesota. The material in this volume is based on six papers presented at the 1968 symposium. For each symposium a number of outstanding child psychologists are invited to give papers dealing with their respective programs of research.The contents of this volume are: “Effects of Stimulus Familiarization on Child Behavior” by Gordon N. Cantor, University of Iowa; “Animal Studies of Early Experience: Some Principles Which Have Implication for Human Development” by Victor H. Denenberg, University of Connecticut; “Early Stimulation and Cognitive Development” by Wendell E. Jeffrey, University of California, Los Angeles; “The Development of Stimulus Selection” by Eleanor E. Maccoby, Stanford University; “Adolescent Attitudes and Behavior in Their Reference Groups within Differing Sociocultural Settings” by Muzafer Sherif and Carolyn W. Sherif, both of Pennsylvania State University; “Modeling and Reactive Components of Sibling Interaction” by Brian Sutton-Smith, Teachers College, Columbia University, and B.G. Rosenberg, Bowling Green State University. John P. Hill, the editor, comments on each of the papers in a preface.