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Abstract:
This study examined the effects of shifting attention between
stimulus features of color and shape. The paradigm was a forced
choice task that consisted of the presentation of three adjacent
objects. On each trial, two of the objects were identical and the
other was different. Subjects were instructed to press the button
that corresponded to the location of the unique object based on the
stimulus attributes of color and shape. The unique attribute
changed from trial to trial such that if the relevant attribute was
color on the previous trial, shape was the relevant attribute on
the subsequent trial. Performance on these trials was compared to
performance during a control condition in which trials were blocked
by stimulus attribute. Echo planar images were acquired from six
right handed adults during performance of the task and analyzed
with an analysis of variance using a contiguity threshold of 3
voxels and significance criterion of .005. The preliminary results
suggest reliable activity of the inferior parietal lobule during
shifts of attention to color and shape. The results will be
discussed in the context of recent task switching studies.
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