Lecture 9 - Overview Sensation & Perception PSY 12000:...

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PSY 12000: Fall 2011 Purdue University Dr. Eric D. Wesselmann 1 Overview ¾ Psychophysics z Thresholds z Sensory Adaptation z Subliminal Perception 2 Thresholds ¾ Stimulus: z Any detectable input from the environment. z What is detectable? ¾ Threshold: z Dividing point between energy levels that do and do not have a detectable effect. ¾ Absolute Threshold: z The minimum stimulus intensity that an organism can detect 50% of the time 3 Absolute Threshold 4
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Example Absolute Thresholds Sense Absolute Threshold Vision A candle flame seen at 30 miles on a dark, clear night. Hearing The tick of a watch under quiet conditions at 20 feet. Taste One teaspoon of sugar in two gallons of water. Smell One drop of perfume diffused into entire volume of a six- room apartment. Touch The wing of a fly falling on your cheek from a distance of 1 centimeter. Source: Galanter, E. (1962) 5 Just Noticeable Differences ¾ The smallest difference in stimulus intensity that a specific sense can detect. z
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This note was uploaded on 01/30/2012 for the course PSYC 120 taught by Professor Bethlebreton during the Fall '11 term at Purdue University-West Lafayette.

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Lecture 9 - Overview Sensation & Perception PSY 12000:...

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