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Unformatted text preview: : is concerned with factors that influence sensory judgements. A persons sensitivity can fluctuate, concept of fixed absolute threshold is innacurate. - Decision Criterion: standard of how certain one must be that a stimulus is present before they say they detect it. - subliminal stimulus: one that is so weak or brief that although it is received by the senses, it cannot be perceived consciously Difference Threshold- the smallest difference between two stimuli that people can perceive 50% of the time. Sometimes called the just noticeable difference . (Jnd)- Webers Law- the principle that to perceive a difference between two stimuli, the stimuli must differ by a constant percentage ratio jnd value for Weights 1/50 ex. Lift a 50g weight, it has to be 51g to feel the diff; lift a 500g weight, the second weight should be 10g...
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This note was uploaded on 04/20/2008 for the course PSYCH 105 taught by Professor Young during the Fall '07 term at Washington State University .
- Fall '07