IE577_lecture9

IE577_lecture9 - IE/PSY 577 Session 9 Signal Detection...

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IE/PSY 577 Session 9 Signal Detection Theory
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IE/PSY 577 Session 9 Developed in electrical engineering and based on statistical decision theory First applied to human perceptual discrimination in 1950s Assumes that decisions are involved 2 even in simple discrimination tasks. Provides a means for separating decision criteria from discriminability Applied to a variety of problems measuring accuracy of diagnostic systems reliability of lie detection tests
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IE/PSY 577 Session 9 Detection of signals is crucial to the performance of many tasks: Quality-control inspector xamining products for defects 3 examining products for defects Detection of a flashing warning light by an operator Airport security guard inspecting luggage for weapons
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Example: Screening luggage at an airport for weapons Actual State Signal (signal+noise): Weapon in a suitcase 4 Noise: Items that look like a weapon in a suitcase Response of Screener “Yes” signal (weapon) is present “No” signal (weapon) is not present
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IE/PSY 577 Session 9 General idea behind signal detection methods Trials ignal (signal+noise) 5 Signal (signal+noise) Noise Response “Yes” signal present “No” signal not present
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IE577_lecture9 - IE/PSY 577 Session 9 Signal Detection...

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