Quiz #3 Vocab

Quiz #3 Vocab - Chapter 4&5 Notes Sensation: The...

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Sensation: The detection and encoding of stimuli. Absolute Threshold: The minimum magnitude of stimulus that can be detected 50% of the time. (Special type of a difference threshold) Difference Threshold: The minimum amount a stimulus must change in order for the change in sensation to be detected 50% of the time. *JND = Just Noticeable Difference* E.H. Weber: (1830’s) Weber Fraction: The amount of stimulation necessary to result in a “Just Noticeable Difference” is a constant fraction of the stimulus intensity. EX : For weight=K=1/50 (Weber Fraction)- Varies w/ sensory mobility 1 lb = 2 lb = 1/5 lb 50 lb 100 lb 10 lb Gustav Fechner (1801-1887): JND’s are units of psychological changes in sensation. Proposed a new law describing the relationship between psychological and physical events: S=K Log I S=Psychological (Units: JND’s) K=Weber Fraction Log I: Physical (Units: lbs, db, etc.) Refraction: bending of light rays Fovea: In the retina, responsible for highly detailed vision and color. Most sensitive.
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Quiz #3 Vocab - Chapter 4&5 Notes Sensation: The...

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