The booklet summarizes proceedings from a conference on prenatal and perinatal factors associated with learning disabilities and neurological problems. Many of the papers report data from the Collaborative Perinatal Project of the National Institute of Neurological and Communicative Disorders and Stroke, a longitudinal study of pregnancy conditions. The first 12 papers consider the following interdisciplinary factors in learning disabilities: genetics, hormones and the brain, microneuronal hypoplasia, nutrition, maternal infections, environmental pollutants, prenatal drugs, smoking and drinking, obstetric medications, obstetrical trauma, low birth weight, and issues in infant assessment. A report of participants' discussion focuses on definitional issues; animal models and human behavior; links between biochemistry and behavior; and prediction, prevention, and intervention. (CL)