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advanced research methods psyc325 signal detection theory with special thanks to dr murray white n.
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Advanced Research Methods PSYC325 Signal Detection Theory with special thanks to Dr. Murray White

Advanced Research Methods PSYC325 Signal Detection Theory with special thanks to Dr. Murray White

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Advanced Research Methods PSYC325 Signal Detection Theory with special thanks to Dr. Murray White

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  1. Advanced Research MethodsPSYC325Signal Detection Theorywith special thanks to Dr. Murray White Dr. Jan Lauwereyns EA619, ext. 5042 Jan.Lauwereyns@vuw.ac.nz

  2. Lecture notes, available on website http://pavlov.psyc.vuw.ac.nz/325 • Brief concepts Green, D. M., & Swets, J. A. (1966). Signal Detection Theory and Psychophysics. New York: John Wiley.

  3. Response Stimulus Stimulus – Response Matrix

  4. Response Stimulus Response Stimulus

  5. Special die: three or naught

  6. The special die has to be 0 If the total is 3… The special die has to be 3 If the total is 14… The special die can be either 0 or 3 If the total is 8…

  7. If the total is 6… Special die = 0 Special die = 3

  8. Possible outcomes of each throw You say… The special die is…

  9. > > > > > >

  10. > 7 > 10

  11. > 7 > 10

  12. > 7 > 10 +$120 -$120

  13. Now let’s use a different die: A special die with three faces ‘6’ and three faces ‘0’ instead of three faces ‘3’ and three faces ‘0’

  14. Special die with 3’s and O’s There is no 3 There is a 3 Total of the three dice

  15. Special die with 6’s and O’s There is no 6 There is a 6 Total of the three dice

  16. Left liberal

  17. Right conservative

  18. beta versus d’ • Effects of • signal-to-noise ratio (d’) • decision criteria (beta) • Effects of • perceptual sensitivity • response bias

  19. Effects of Scene Context on Object Perception De Graef, Henderson, Hollingworth There is only a response bias Biederman & co. Context facilitates the perception of congruent objects

  20. Effects of Reward Expectation on Neural Mechanisms of Visual Discrimination

  21. Lauwereyns et al. (2002, Neuron): “wishful seeing” Reward leads to general increase of neural activity = bias effect; no change in d’

  22. Summary • Signal detection theory allows you to… • Consider choice situations systematically • Tease apart underlying processes • Sensitivity • d’ (“d prime”) • Signal to noise ratio • Information characteristics • Bias • beta (criterion) • Likelihood of response • Demand characteristics