Gibson and Pick argue that infants are active learners who perceptually engage their environments and extract information from them.This ecological approach to development - defined as a 'theory about perceiving by active creatures who look and listen and move around' - was spearheaded by the Gibson and Gibson in the 1950s.This book, written by one of the most eminent experimental psychologists of the 20th Century, is the summary and capstone of a long and fruitful experimental tradition.