Download or read book Developmental Influences on Adult Intelligence written by K. Warner Schaie and published by . This book was released on 2013 with total page 598 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents the history, latest data, and results from the Seattle Longitudinal Study (SLS). The purpose of the SLS is to study various aspects of psychological development during the adult years. Focusing on a random sample of 500 adults ranging in age from 25 to 95 years old, the SLS is organized around 5 fundamental questions.