PSYC 1000: Introduction to Psychology, Week 4: Sensation & Perception

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PSYC 1000:Introduction to PsychologyWeek 4:Sensation & PerceptionJanuary 28, 2020Module 4.1: Introducing sensation and perceptionModule 4.2: VisionModule 4.3: HearingModule 4.1 - OverviewSensation and perception: What’s the difference?
Sensation & Perception: What’s the difference?
What you see is not necessarily what you get!From stimulus to perception:
Psychophysics:Studies relations between physical characteristics of stimuli and sensory capabilities.Concerned with two kinds of sensitivity.Absolute thresholdAsks about the absolute limits of sensitivity.How bright does light have to be before we can see it?Difference thresholdAsks about the difference between stimuli.What is the smallest difference in brightness that we can detect?Absolute threshold:The lowest intensity at which a stimulus can be detected correctly 50% of the timeLower absolute threshold = greater sensitivityDifference threshold:Smallest difference between two stimuli that can be detected 50% of the timeJust noticeable difference (JND) (Weber, 1830’s)Weber’s lawJND is proportional to the magnitude of the stimulus with which the comparison is beingmade.ie, it is more difficult to detect a given difference between two magnitudes ifthose magnitudes are large instead of smalleg: harder to detect a difference of 1 jelly bean if comparing jars of 1000vs 999 beans than if comparing jars of 2 vs 3 beansSensory adaptation:
Diminishing sensitivity to an unchanging stimulusOccurs in all sensory modalitiesAdaptive value

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Term
Spring
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Photoreceptor cell, afterimages

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