Previous training as a determinant of response dependency at the threshold.

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Abstract
This experiment consisted of five experimental sessions, one devoted to an original threshold determination for each of six Ss and the other four devoted to 300 successive single-brightness stimulation periods per session. The six Ss were divided into two groups of three Ss each. Group I was given intensity-ordered stimulations in all threshold determinations on the first three days of the experiment; Group II was given randomized stimulus brightnesses at the comparable times. On the last two days of the experiment the procedures for Groups I and II were reversed. Despite the differences in training procedures for the two groups, both groups exhibited nonindependence of responses in the single-brightness series. Some evidence was found for a linear trend toward decreased frequency of seeing late in each experimental session. Although this factor alone might produce nonrandomness of response, there is strong evidence that other mechanisms are operative. (PsycINFO Database Record (c) 2006 APA, all rights reserved)
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