This is a new edition of the established reference and graduate text on experimental psychology. Widely used for over 25 years, this edition has been completely updated and expanded into two volumes; contributors to these works are among the most highly renowned professionals in the field. Volume 1 includes coverage of the physics and retinal physiology of vision; the nature of auditory perception, speech, and emotional patterns; and the latest theories and findings in the area of behavioral genetics. Volume 2 includes studies exploring such topics as the psychobiology of learning and memory; the influences of choice and reinforcement in human behavior; psycholinguistics; individual variations in cognitive functioning, and much more.