Sensation: The process whereby our sensory organs gather information from the outside world.
Perception: The process whereby the brain interprets and organizes these sensations.
The study of how physical stimuli are translated into psychological experience.
Absolute Threshold: The point at which a person can detect the lowest intensity of light 50% of
Difference Threshold (jnd): Is the smallest difference in stimulation required to discriminate 1
stimulus from another, 50% of the time.
People are able to perceive very small changes if the magnitude of reference stimulus is small,
but as that magnitude increases, a greater change is necessary before one can perceive a
Signal Detection Theory
Proposes that the detection of stimuli is based on: