The Psychophysics Psyber Lab




Common Noise Sampling Variability in Psychophysical Experiments

Judi Lapsley Miller

25 August 1995
Psychology Department Research Seminar


The results of all psychological experiments are noise degraded. In psychophysical experiments this noise degradation can be modeled as coming from two types of noise sources: unique noise sources and common noise sources. One source of common noise is caused by the size of the stimulus set. If the stimulus set is too small then the variability in measures of sensitivity may be so great as to render any inference useless. This seminar will look at the results of a computer simulation of common noise sampling variability. The simulation estimates the amount of variability in measures of sensitivity as a function of the number of stimuli. This allows estimation of the number of stimuli for a real stimulus set.

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