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18_RecognitionJudgments-1

# 18_RecognitionJudgments-1 - Recognition Judgments Judgment...

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Recognition Judgments Judgment Under Uncertainty – Signal Detection theory Remember/Know Model of Recognition

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Suppose you see a set of photos and must select those  of friends (targets).  The photos of strangers will be  called distracters.  There are four possible outcomes for  each photo. You select a friend (hit). You reject a friend (miss). You select a stranger (false alarm). You reject a stranger (correct  rejection).
Signal Detection Theory Response Target Distracter State of World Target Hit Miss Distracter False Alarm Correct Rejection

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Signal Detection Theory If you can recognize your friends then  you  will select a higher per  cent of the friend’s  photos (hits) than of the stranger photos  (false alarms). Notice that the per cent of misses is 1 – per   cent (hits) and the per cent of CR’s is 1 – per  cent (FA).  So these measures are redundant.  Both hits and false alarms must be measured  to determine sensitivity  (d’) .
Signal Detection Theory To measure recognition of a target, both  targets and distracters are presented.   Both the per cent of targets called  targets (hits) and the per cent of  distracters called targets (false alarms)  must be measured.

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