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Chapter 4

oct. 12 chapter 4.docx

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Department
Psychology
Course Code
PSYC 1001
Professor
all

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Chapter 4 Sensation and PerceptionSensation and perception the distinctionSensation stimulation of sense organs Perception selection organization and interpretation of sensory input choosing or selecting what to perceive ThresholdsSensations begin with a detectable stimulus detectable environment event Thresholds dividing point between energy levels that are and are not detectable use to take averagesAbsolute threshold detected 50 of the time low in intensity just noticeable differenceJND smallest difference detectable Webers law size of JND proportional to size of initial stimulus when you have a smaller amount of intensity and it increases more likely to notice itlarger intensity the more you need Signal detection theorySignal detection theory sensory processes and decision processesNot a threshold theory Looking at process of making a decision Is the signal present or noteg Do you know the person you see in the coffee shop Factors influencing your decision fatigue peer pressure personal expectations irrelevant noise etcPsychologists study STD to see the way in which we make decisionsBiases are measuredSubliminal perception The registration of sensory input without conscious awareness Eg the Beatles
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