PSY-3215 Lecture 6: 8-31 / Perception
Document Summary
Catch trial: no-stimulus-trial that allows for the experimenter to make sure the observer is paying attention. One situation: out of 100 trials, 90 would be true trials and 10 would be catch trials. Observer is more likely to say they heard it. Another situation: out of 100 trials, 10 would be true trials and 90 would be catch trials. Observer is less likely to say they heard it. Started from a war effort to improve the sensitivity of the radar operators. There will only be one stimulus used. Manipulate the percentage of times that the stimulus is present. Hit rate = 1. 0 / miss rate = 0. 0. False alarm rate = 0. 0 / correct rejection rate = 1. 0. Hit rate = 0. 5 / miss rate = 0. 5. False alarm rate = 0. 5 / correct rejection = 0. 5. Hit rate = 0. 88 / miss rate = 0. 12. False alarm rate = 0. 65 / correct rejection rate = 0. 35.
