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Abstract:
Two experiments examined the interaction between the Simon
effect (SE) and inhibition of return (IOR). The SE refers to better
performance when the task-irrelevant location of the imperative
stimulus and response spatially correspond relative to when they do
not correspond. IOR refers to better performance when the location
of a precue and target do not correspond relative to when they do
correspond, when cue location is task irrelevant and stimulus onset
asynchrony (SOA) is generally greater than 400 ms. In the present
investigation, the form of the precue provided subjects with
response selection information, and the target provided response
execution information. To the extent that IOR has a motoric
component, inhibition at the cued location should reduce the SE.
Similarly, this prediction is in line with an attention shifting
account of the SE: there should be a smaller SE at the cued
location relative to the cued location. At the long SOA, IOR was
larger when the spatial location of the target and response
corresponded relative to when they did not correspond. Similarly,
SE was greater at the uncued than at the cued location. The
magnitude of IOR was influenced by the intentions to produce a
response. The results support an attentional-motor view of IOR and
they support an attention-shift account of the SE.
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