psychch4 - SENSATION & PERCEPTION: Part 1 7/2/07...

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Psychophysics - the physical world and perceived experience     * Studies the relationship between physical stimulus characteristics and the psychological  experiences they produce. Early experimental psychology. 1)Absolute Threshold : minimum amount of energy that can be reliably detected 50% of time.  Subliminal stimuli. [cannot ever be 100% reliable] Sprite;subliminal advertising Why only 50% of the time?  1) internal noise 2) response bias         EX: *Medical Diagnosis               *Jury Decisions               *College Admission Selections 2) Difference Threshold : judging whether two stimuli are the same or different. *how different do two stimuli have to be to have us notice they are different? Weber's Law:  JND (just noticeable difference) = K (constant) x I (stimulus intensity).  The  smallest detectable difference  in stimulus energy is a constant fraction of the intensity of the  stimulus, e.g.making the music louder if soft or loud . Weber's Constant is different for different  senses, reflecting sensory sensitivity. *Ex: if you have a bright light, a huge difference is minimal. If you have a dim light, a huge  difference is seen very easily. -Pitch, Brightness and Weight: high sensitivity -Saltiness of taste: not so much Fechner's Law and psychophysical scaling:  perceptions of sensory experiences are not  simply linear functions of physical stimulation. Signal Detection Theory:  deals with internal "noise", response bias involved in hits, misses,  false alarms and correct rejections.  *******************************************************
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1) bottom-up processing: analytically. [look at features] hardest to do. 2) top-down processing: depends on context clues
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This note was uploaded on 04/07/2008 for the course PSYC 1101 taught by Professor Leader during the Summer '07 term at Georgia Institute of Technology.

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psychch4 - SENSATION & PERCEPTION: Part 1 7/2/07...

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