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Two experiments are reported in which we manipulated relevant and irrelevant
stimulus dimensions to assess whether an increase in temporal overlap would
influence the time course of a "standard" Simon effect
(obtained when visual stimuli are presented on the left/right of the
screen and left/right responses are performed with uncrossed hands).
This procedure is new in two ways: First, the manipulations were intended to
reduce, instead of increase, the distance between conditional and unconditional
response-activation processes. Second, we manipulated the relevant and
irrelevant stimulus dimensions in a manner that did not vary stimulus onset
asynchronies, precues, or go/no go trials, or alter the stimulus
quality. Results were consistent with the hypothesis that when the two response
processes are shifted closer to each other, the Simon effect would be sustained
across time, instead of decreasing as typically found. These findings are
discussed in line with the temporal overlap hypothesis and with an automatic
activation account.