Common noise sampling variability in psychophysical experiments

Table of contents

Slide 1 Common noise sampling variability in psychophysical experiments

Slide 2 Examples of noise sources

Slide 3 Common & unique noise

Slide 4 An example of observer inconsistency

Slide 5 The theory of signal detectability

Slide 6 An ideal observer

Slide 7 How useful is the ideal observer?

Slide 8 100 sample-ROC curves

Slide 9 Why is sampling variability a problem?

Slide 10 Simulations of sampling variability

Slide 11 Simulations of sampling variability continued...

Slide 12 Variability of ROC curves as sample size is increased

Slide 13 Sampling variability of the Area as a function of sample size

Slide 14 SD of Area as a function of number of samples

Slide 15 Effect of signal-to-noise ratio on sampling variability

Slide 16 Comparisons of different models with the same Area

Slide 17 Calculating the size of the stimulus set

Slide 18 Judi's data from 3 x 250 stimuli per event experiment

Slide 19 Judi's GOC curves

Slide 20 Sizes of stimulus sets in the literature

E-mail: judi@psychophysics.org

Homepage: www.psychophysics.org

Further information:
Psychology Department research seminar, presented 25 Aug 1995.

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