PS_Measurement_Theory_2

PS_Measurement_Theory_2 - Approaches to Understanding...

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25 Approaches to Understanding Vision Natural tasks Natural scene statistics Anatomy Responses of individual neurons Responses of neural populations Perceptual/behavioral performance Mathematical and computational modeling
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26 objective subjective identification estimation description Behavioral Tasks feedback no feedback A B C Different perceptual tasks can be classified by picking one attribute from each column.
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27 2AFC Task Example of an objective identification task with feedback. If there are just two alternatives, then such tasks are often called a discrimination tasks ; if one of the alternative is “uniform” in some fashion, then such tasks are often called a detection tasks . The observer must decide whether a target pattern is in the first temporal interval or the second temporal interval.
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28 Illustration of the two-interval two-alternative forced choice task and the concept of the psychometric function.
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29 E E E E E E E E E E E 0.4 0.5 0.6 0.7 0.8 0.9 1 0 0.1 0.2 0.3 0.4 0.5 0.6 Proportion Correct Vernier Offset (min of arc) A real example of a psychometric function. Each data point represents the proportion correct for a block of 30 trials.
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This note was uploaded on 08/12/2008 for the course PSY 323P taught by Professor Geisler during the Spring '08 term at University of Texas.

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PS_Measurement_Theory_2 - Approaches to Understanding...

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