Abstract
A 2-interval, 4-alternative psychophysical procedure was used in which the signal could occur in (a) the first interval only, (b) the second interval only, (c) both intervals, or (d) neither interval. The observer was forced to choose one of these 4 alternatives. Comparison of the detectability in either interval alone, with the detectability in both intervals, allows one to estimate temporal dependencies. The neural-quantal model predicts strong temporal dependencies over short periods of time. On the other hand, theories of the signal-detectability variety have generally assumed independence. Two experiments were conducted. In the first, the signal was a pulsed sinusoid in noise, in the second, a phase-locked increment in a sinusoidal background. [Research supported in part by the National Institutes of Health, U. S. Department of Health, Education, and Welfare, grant NB-04949-01, and by the National Science Foundation, grant GB 1462.]
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