day04 - Psychology 2050 Perception 7 Sept 10 Day 04

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Psychology 2050 Perception 7 Sept 10 Day 04 http://blackboard.cornell.edu http://susan.psych.cornell.edu
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         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. fixed 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
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         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. fixed 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
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Signal Detection Methods Four categories of responses
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2X2 matrix double graph with lines z  table
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Two aspects to be measured from a 2X2  matrix of data  in Signal Detection Theory:    Criterion  β           bias     mental set Sensitivity d’  physiological attunement
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Assumptions: 1. normal distribution (of neural noise) relatively long digression into: properties of "normality" z scores 2. signal with unchanging strength 3. fixed decision criterion
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Distributions bar graph
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frequency polygon
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3 properties 2 1 3
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axes Ratio or Interval Scale
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This note was uploaded on 01/27/2011 for the course PSYCH 2050 at Cornell University (Engineering School).

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day04 - Psychology 2050 Perception 7 Sept 10 Day 04

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