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class+3+lecture_posted - Sensation and Perception Class...

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Sensation and Perception Class III: Psychophysics (cont.) & Elementary Neuroscience
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Theory of Signal Detection
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Figure 1.14 Threshold measurement using the method of constant stimuli
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What might be the problems with the whole concept of measuring threshold?
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Theory of Signal Detection Signal detection theory: A psychophysical theory that quantifies the response of an observer to the presentation of a signal in the presence of noise Signal detection theory rejects the concept of a threshold. Instead it emphasizes expectation and reward contingencies.
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Theory of Signal Detection There are four possible stimulus/response situations in signal detection theory: Hit: Stimulus is presented and observer responds “Yes” Miss: Stimulus is presented and observer responds “No” False alarm: Stimulus is not presented and observer responds “Yes” Correct rejection: Stimulus is not presented and observer responds “No”
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Figure 1.16 Detecting a stimulus using the signal detection theory (SDT) approach (Part 1)
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Figure 1.16 Detecting a stimulus using the signal detection theory (SDT) approach (Part 2)
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Figure 1.17 Sensitivity to a stimulus: The separation between the distributions of response to noise alone and to signal plus noise
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Figure 1.18 For a fixed d , all you can do is change the pattern of your errors by shifting the response criterion
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Theory of Signal Detection Receiver operating characteristic : In studies of signal detection, the graphical plot of the hit rate as a function of the false alarm rate
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Figure 1.19 Theoretical receiver operating characteristics (ROC) curves for different values of d
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Theory of Signal Detection Advantage of TSD for threshold detection : detects and controls for response biases Disadvantages : requires hundreds of trials, assumes normal distributions of noise and signal
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Elementary Neuroscience
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This note was uploaded on 11/17/2011 for the course PSYCHOLOGY 830:301 taught by Professor Staff during the Spring '10 term at Rutgers.

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class+3+lecture_posted - Sensation and Perception Class...

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