Ch 4: Sensation and Perception

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6 Terms

1
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Transduction

sense receptors convert physical signals from environment into neural signals sent to CNS

2
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Psychophysics

systematically relate physical characteristics to perception

3
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absolute threshold

minimal intensity to detect stimulus 50% of time

4
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acuity

how well we can distinguish 2 similar stimuli

5
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just noticeable difference (JND)

minimal change in stimulus

  • not fixed: depends on sense & intensity of og stimuli

  • can be larger or smaller

6
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weber’s law

JND is proportional to initial intensity of stimulus

  • larger stimulus → larger JND needs to be for detection