PS262 Study Guide - Final Guide: Neural Coding, Ponzo Illusion, Dermis

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15 Apr 2017
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Similar to the psychophysical experiment but differs in that only one stimulus intensity is presented in some trials and no stimulus is present (catch trials) Amount of sensory information that observed needs to say yes : low criterion: will say yes even if they don"t perceive much evidence for the tone (liberal, high criterion: less willing to say yes (conservative responder) Method of constant stimuli has no catch trials. Ricky has 90% hit, 10% miss, 50/50 f. a and c. r. Julian had 70% hit, 30% miss, 10 % f. a and 90% c. r. Receiver operating characteristic, observers performance on detection task. Signal is the stimulus presented to the person. Noise is all other stimuli in the environment (can be mistaken for the signal) and causes false alarms . Distance between n and the s+n probability distribution changes the shape of the roc curve. A larger distance between n and s+n=higher sensitivity and more bowed roc curve (more to the left)