PSY 2104 Chapter Notes - Chapter 0: Receiver Operating Characteristic
1 Oct 2017
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Document Summary
Signal detection experiment only 1 stimulus intensity is present no stimulus is presented in some of the trials. Payo : a system of rewards and punishments used to in uence a participant"s motivation in a signal detection experiment. Receiver operating characteristic (roc) curve: solid curve going through point l (liberal point) person"s sensitivity is indicated through roc curve shape. Signal detection theory (sdt) signal: stimulus presented noise: other stimuli in the environment. Probability distributions what the chances are that the loudness of the stimuli is due to noise (n) or signal + noise (s+n) Liberal criterion present noise (n) high probability of false alarm present signal + noise (s+n) high probability of hits. Neutral criterion present (n) low probability of false alarm present (s+n) high probability of hits. Conservative criterion present (n) low probability of false alarm present (s+n) low probability of hits.
