Sensation- the process whereby our sensory organs gather info from the external world (stimulation of the sensory organs). Perception- the process whereby the brain organizes and interprets these sensations so that they have some meaning. Psychophysics- the study of how physical stimuli are translated into psychological experience. )- is the smallest difference in stimulation required to discriminate one stimulus from another, 50% of the time: between the reference stimulus and the, difference stimulus (extra stimulus to detect stimulus, weber"s law. 3 types of perceptual organization: form perception- how stimuli are organized into meaningful patterns on shapes, depth or distance perception- how we can see 3-dimensions when the retina only records only 2, perceptual constancies. Gestalt psychologists argue that there are basic laws that generally hold true for people to organize stimuli. Binocular cues result from two processes: convergence- eyes move more inward as an object gets closer.