3-27-07 RecallHO

3-27-07 RecallHO - Cognition: Recall March 27, 2007 Lecture...

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     Cognition:  Recall March 27, 2007
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    Lecture Outline Signal Detection Theory (Results) Retrieval Part 2 – Recall. Cue generation. Cue types and their effects.
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    Receiver Operating  Characteristics Brightness Probability Of Detectiton 0 % 100 % Absolute Threshold Continuous Sensitivity
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    The brain is a continuously  sensitive receiver Signal and noise distributions overlap when  the signal is weak A response criterion (beta) must be set to  discriminate signal from noise Both hits and false alarms must be measured  to determine discriminability (d’) People differ in their sensitivity and criteria
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    Signal Detection Theory Response Target Distracter Target Hit Miss State of World Distracter False Alarm Correct Rejection
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    How did we do? P(Hit) = 0.8775; z  = -1.16; height =  0.2036 P(False Alarm) = 0.0255; z = 1.95;  height = 0.0595 d’ = 1.96 – (-1.16) = 3.16 β  = 0.2036 / 0.0594 = 3.42
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    Who can discriminate? Observers Hits False Alarms d’ β Alan 60% 35% 0.63 1.04 Betty 60% 60% 0 1 Calvin 35% 35% 0 1
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    Anne can discriminate better  than. .. Observers Hits FA’s d’ β Anne 60% 40% 0.5 1.0 Bart 55% 45% 0.26 1.0 Cher 55% 40% 0.38 1.03 Dave 60% 45% 0.38 0.97 Edna 10% 8% 0.13 1.19
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    Retrieval Part 2 -- Recall Cue generation Cue types and their effects
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    The Role of Generation in  Recall Target : Whatever a person is attempting to  recall. Distracter: 
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3-27-07 RecallHO - Cognition: Recall March 27, 2007 Lecture...

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