PSYCH 100 Notes Chapter 4

PSYCH 100 Notes Chapter 4 - CHAPTER 4 Sensation and...

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CHAPTER 4 – Sensation and Perception Sensing the Environment Sensory Receptors – specialized cells in the nervous system that transform energy in the environment into neural impulses that can be interpreted by the brain in a process called transduction Absolute Threshold – minimal amount of physical energy (stimulation) needed for an observe to notice stimulus Difference Threshold – lowest level of stimulation required to sense that a change in stimulation has occurred Weber’s Law – perceptual law which states that for two stimuli to be perceived as differing in intensity, the second must differ from the first by a constant proportion (addition of 2 pounds is more noticeable in a 5 pound backpack than in a 60 pound backpack) Fechner’s Law – law of psychophysics which states that the subjective magnitude of a sensation grows as a proportion of the logarithm of the stimulus (people experience only a small percentage of actual increases in stimulus intensity but the percentage is predictable)
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