The distribution of latencies constrains theories of decision time: A test of the random-walk model using numeric comparison

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Abstract
The random‐walk model for decision accurately predicts both mean reaction time and response accuracy as a function of signal strength and response criterion. Although few have examined the changes, the theory also predicts changes in the shape of the distribution of latencies. In a digit‐comparison task, we used numeric distance to manipulate signal strength, and we used speed versus accuracy instructions to manipulate response criterion. Random‐walk theory correctly predicted changes in the shape of the distribution of response times.

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