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PSYA01H3 (1,206)
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PSYA01 Ch 5

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Steve Joordens

Ch 5 Sensation 126166Sensation the detection of the elementary properties of a stimulusPerception the detection of the more complex properties of a stimulus including its locationnature involves learning Seeing the clr red is a sensation seeing a red apple is perceptionTransduction the process by where sense organs convert energy f envt events physical stimuli into neural activity changes in receptor cells Receptor cell a neuron that directly responds to a physical stimulus such as light vibrations or aromatic moleculesEye is the sense organ light is the envt stimuliradiant energy is transduced Anatomical coding a means by which the nervous system represents info to the brain diff features are coded by the activity of diff neurons interprets the locationtype of sensory stimulus according to which nerves are activeTemporal coding a means by which the nervous system represents info to the brain diff features are coded by the pattern of neuron activity the coding of info in terms of time rateThe firing of a particular set of neurons anatomical code tells where the body is being touched the ratewhich these neurons fire temporal code tells how intense that touch isPsychophysics a branch of psychology that measures the quantitative relation btw physical stimuliperceptual experienceThe Principle of the Justnoticeable difference jnd the smallest difference btw 2 similar stimuli that can be distinguished difference thresholdWeights of 2 metal objects feel the same unless they differ by a factor of 1 in 40 diff sensesdiff ratiosUnits of jnd are a measure of the subjective perception Weber fraction the ratio btw a justnoticeable differencethe magnitude of a stimulus reasonably constant over the middle range of most stimulus intensities Fechner noticed that the graphs curve btw sensationstimulus intensity is characteristic of a logarithm functionStevens proposed a power function for the relsh S kIbS sensation k mathematical constant for how phys intensity is measured I intensity of physical stimulus b the intensity change is raised to this power Signal Detection Theory a mathematical theory of the detection of a stimuli which involves discriminating a signal f the noise in which it is embeddedwhich takes into account participants willingness to report detecting the signal involves activity of sensory systems motivationprior experienceResponse bias ones tendency to say yes or no when youre not sure whether you detected the stimulusHits yes when the stimulus is presentedMisses no when its presented Correct Negatives no when the stimulus isnt presented False Alarms yes when the stimulus isnt presented Receiving Operating Characteristic Curve ROC a graph of hitsfalse alarms of participants under diff motivational condt indicates ppls ability to detect a particular stimulus Threshold the pointwhich a stimulus can just be detectedThe threshold is the pointwhich a participant detects the stimulus 50 of the time variable activity in the nervous system
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