PSYC 2000 Chapter : Sensation And Perception Pt 1
Document Summary
Thresholds: absolute threshold: minimum stimulation need to detect a particular stimulus 50% of the time, difference thresholds: minimum difference between two stimuli required for detection. 50% of the time, also called just noticeable difference (jnd) In humans, difference thresholds (experienced as a just noticeable difference) increase in proportion to the size of the stimulus: two stimuli must differ by a constant minimum percentage (rather than a constant amount) to be perceived as different. Habituation: the tendency of the brain to stop attending to constant, unchanging information, the brain ignores stimuli that are being sensed, nut do not change. Sensory adaptation: the tendency of sensory receptors to become less responsive to a stimulus that is unchanging, receptors less responsive to the stimulus, and therefore no longer send signals to the brain. Light: transduction: the transformation of stimulus energy into neural impulses, phototransdutins:
