Sensation and Perception. Chapter 4. Defining Sensation and Perception. Sensation The detection of physical energy emitted or reflected by physical objects. It occurs when energy in the external environment or the body stimulates receptors in the sense organs. Perception
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The smallest amount of change in a stimulus that can be detected half the time.
JND is proportional to the magnitude of the stimulus
The larger the stimulus the larger the change must be to be noticed!!
Light, Weight or Tone?Stimulus Discrimination