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Lecture 11

Psychology 1000 Lecture 11: october 25th lec notes

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Western University
Psychology 1000

Chapter 5: Sensation and Perception ➢ Psychophysics What do Weber fractions tell you about sensation? ➢ Subliminal Perception Can we perceive subliminal messages? ➢ Visual System How does the visual system work? Next time: More vision Scan: pg. 143-151 How do we perceive the world around us? - Psychophysics and psychophysiology Psychophysics: - Relation between physical stimulus and psychological response - Fechner: Father of psychophysics - Can determine a just noticeable different (JND) Threshold: - Value of a stimulus characteristic required to produce some response - Absolute: Lower limit - Difference: amount of change for JND Weber’s Law (need to know how to calculate it): - Size of the difference threshold relative to physical intensity of test constant - If I= 50db and a JND is report at 55db o 5/50= 1/10 - can predict other JND’s o whats a JND @ 100 db? ▪ x/100=1/10 ..solve for x - the value if JND not constant - can compare sensitivity of different systems Fechner’s Law: - sensation incr
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