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Updated: Aug 14, 2026

Perceptual and Category Processing of the Uncanny Valley Hypothesis' Dimension of Human Likeness: Some Methodological Issues
Published on: June 3, 2013
Singularities in the inverse modeling of 2AFC contrast discrimination data
Mikhail Katkov1, Misha Tsodyks, Dov Sagi
1Department of Neurobiology/Brain Research, The Weizmann Institute of Science, Rehovot 76100, Israel.
Abstract:
Analytical calculations show that two-alternative force-choice data are not always suitable for specifying the parameters of the underlying discrimination model. Experimentally, we show here that in the case of contrast discrimination in humans, a variety of models spanning a large range of parameters can explain the data within an experimental error. Monte-Carlo simulations indicate that the number of trials in psychophysical experiments is not the limiting factor in estimating the parameters in contrast discrimination. These results can therefore explain the contradictory conclusions made by different groups about the relationship between the response to contrast and the noise amplitude.
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