PSYC 2390 Chapter : Signal Detection Theory

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Only one stimulus intensity is presented and on some of the trials, no stimulus is presented. Hit, miss, correct rejection and false alarm. An individuals sensitivity is determined by the shape of the roc curve, so if experiments on two. The solid curve going through point l is called a receiver operating characteristic (roc) curve people result in identical roc curves, they have equal sensitivities. Theoretical basis underlying the ideas that the percentage of hits and false alarms depends on a persons criterion and a persons sensitivity to a stimulus is indicated by the shape of the persons. The signal is the stimulus presented to the person (e. g. tone), noise is all the other stimuli in the environment that may confuse you and cause you to give a false alarm. Signal detection theory describes the procedure in terms of presenting signal plus noise (s+n) or noise (n), noise is always present.