Sensation and Perception - signaldetectiontheory.ppt © 2001 Dr. Laura Snodgrass, Ph.D. Signal Detection Theory No threshold theory BIG IMPROVEMENT –because.

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Sensation and Perception - signaldetectiontheory.ppt © 2001 Dr. Laura Snodgrass, Ph.D. Signal Detection Theory No threshold theory BIG IMPROVEMENT –because separates out two measures –d’ (dee prime) –  (beta) Based on measuring spontaneous activity - noise in the nervous system

Sensation and Perception - signaldetectiontheory.ppt © 2001 Dr. Laura Snodgrass, Ph.D. Signal Detection Theory

Sensation and Perception - signaldetectiontheory.ppt © 2001 Dr. Laura Snodgrass, Ph.D. Factors That Affect d’ and B d’ –sensitivity to the stimulus –intensity of the stimulus B –known probability of stimulus occurrence –outcomes (payoff) –stimulus intensity

Sensation and Perception - signaldetectiontheory.ppt © 2001 Dr. Laura Snodgrass, Ph.D. Receiver Operating Characteristic Curves

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