Abstract
Signal Detection Theory (SDT) predicts that the presence of uncertainty will diminish the observer's sensitivity to visual signals, and increase the exponent of the psychometric function. The first prediction has been confirmed previously with spatial and chromatic uncertainty. The second prediction is confirmed in this paper. The psychometric function is commonly found to be a positive accelerating function of intensity. This has been explained by two competing theories: the uncertainty hypothesis and the nonlinear transducer theory. A second experiment is conducted to distinguish between these theories. The results of this experiment are inconsistent with the nonlinear transducer theory.
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