Results of the Collaborative Perinatal Project report disclose the risk factors for mental retardation found in children examined from the prenatal period to age seven. Both biological and social risk factors are analyzed for both severe and mild cognitive deficits. The authors of this volume investigated the etiologies of the neurological subgroups of the retarded and reveal, through comparisons with non-retarded groups, important population factors related to normal cognitive development.

"This book provides a wealth of data [which] will undoubtedly be mined for many years by persons interested in characterizing the relative contributions of environment and genetics to the development of high and low intelligence. Overall, the book is a most valuable sourcebook of incomparable information."—CHOICE