Transitivity of visual judgments of simultaneity.

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Abstract
Judgments of the simultaneity of pairs of brief light flashes are not in general veridical, i.e., objective and subjective simultaneity relations are not identical. To explain this discrepancy, it was proposed that there exists a simultaneity center in the brain where paths of excitation from the visual system must coincide to produce the experience of simultaneity. The experiment tested an implication of the simultaneity center hypothesis, that simultaneity judgments are transitive. 3 experienced Os were monocularly presented with pairs of 5-msec light flashes. 3 stimulus lights, F, N, and E, were presented pairwise in 3 sessions: F vs. N, F vs. E, and N vs. E. Thresholds of simultaneity were obtained for each session in terms of the interstimulus interval required to produce subjective simultaneity. Within the experimental variability obtained, the transitivity relation was confirmed which supports the simultaneity center hypothesis. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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