Sensation and Perception

a. Two people who are exposed to similar physical energies will receive similar "raw data" from the external world. b. Different people may perceive a stimulus in varying ways. c. There are certain common errors of perception, which we call illusions. d. For the most part, our perceptual systems allow us to navigate safely through a bewildering array of external stimuli. e. We are not equipped to detect or respond to all the physical energies that exist.