day 04 - signal detection - S ignal Detection Theory...

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Psychology 2050 Perception 6 Sept 11 Day 04 http://blackboard.cornell.edu http://susan.psych.cornell.edu Signal Detection Theory Two aspects measured: Criterion β bias, mental set Sensitivity d’ physiological attunement Assumptions: 1. normal distribution (of noise) properties of "normality" means & standard deviations; z scores 2. signal with unchanging strength 3. ±xed decision criterion Some examples, and with criterion shifts: 1. unbiased, Y=N in the “middle” 2. "conservative" Y< N to the right 3. "risky" Y> N to the left Signal Detection Theory Two aspects measured: Criterion β bias, mental set Sensitivity d’ physiological attunement Assumptions: 1. normal distribution (of noise) properties of "normality" means & standard deviations; z scores 2. signal with unchanging strength 3. ±xed decision criterion Some examples, and with criterion shifts: 1. unbiased, Y=N in the “middle” 2. "conservative" Y< N to the right 3. "risky" Y> N to the left Signal Detection Methods Four categories of responses 2X2 matrix double graph with lines z table Two aspects to be measured from a 2X2 matrix of data in Signal Detection Theory: Criterion β bias mental set Sensitivity d’ physiological attunement sensitivity
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1. normal distribution (of neural noise) relatively long digression into: properties of "normality" z scores 2. signal with unchanging strength 3. fxed decision criterion
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This note was uploaded on 09/18/2011 for the course PSYCH 2050 at Cornell University (Engineering School).

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day 04 - signal detection - S ignal Detection Theory...

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