sdt.W09 - 100% detection 0% stimulus intensity very simple...

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stimulus intensity detection 0% 100%
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very simple task
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signal detection task Imagine the simplest task some trials: just noise other trials: a signal in addition to the noise your task: Was it a signal? Or was it just noise?
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Smooth psychometric functions We can decide what kinds of errors we will make. For some decisions we are very confident, some less confident, and others even less confident. Threshold Theories don’t work.
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Signal Detection Theory Intensity is a function of the number of neurons that fire. So If a lot of neurons fire, respond YES. If not so many neurons fire, respond NO.
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“signal” “just noise” Signal hit miss 8/10 = .8 2/10 = .20 Noise false alarm correct rejection 3/10 = .30 7/10 = .70 RESPONSE
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Signal Detection Theory a measurable underlying variable a criterion that can be raised or lowered.
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Was that a signal? Or noise?
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sdt.W09 - 100% detection 0% stimulus intensity very simple...

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