PSYC 100 Chapter Notes -Thalamus, Ganglion, Cochlea
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PSYC 100 Full Course Notes
Verified Note
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Document Summary
Psychophysics-study of the relationship between sensation and perception-> physical characteristic of stimulus and the sensory experience. Sensory threshold- point where the stimulus triggers the start of an afferent nerve impulse. Difference threshold- just-noticeable difference (jnd) between two stimuli. Ernst weber- how sensitive people were to changes in weight-> saw people could more easily detect a very small increase in weight when lifting two light weights than two heavy weights. Gustav fechner-different sensory domains, jnd for a stimulus increases as its intensity increases. Weber"s law-size of the jnd of a stimulus divided by its initial intensity is a constant. As some stimuli becomes intense, a smaller change is required in jnd. Fechner"s law-in every sensory domain, each jnd represents an equal step in the psychological magnitude of a sensation. Changes in stimulus can be compared across sensory domains. Steven"s power law-proposed the relationship between the magnitude of a stimulus and its perceived intensity or strength.
