KINE 3020 Lecture Notes - Lecture 18: Detection Theory, Visual Acuity
24 Nov 2018
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Document Summary
Perceptual performance depends on 2 factors: perceptual sensitivity: d" (d prime, expectancies about the rewards and penalties: our expectancies play a role in our perception of stimuli. If we walk into the room we expect mosher to be there, but if we see him on the street we"re not sure because we don"t expect him to be there. Signal detection theory lets us identify these theories independently of one another. Whether we make a correct decision or an error depends on our perception and the rewards available perceptual sensitivity is measured by d". When the curves are close together you have low sensitivity, when they are far apart you have high sensitivity, so you get less wrong. How does d" change: environmental conditions that change can a ect your sensitivity, d" is the distance between the two curves, becoming less sensitive. D" and beta change independently, but they both a ect performance.
