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Abstract:
This study investigated object-based selective attention in a
split-brain patient. The subject, JW, was presented with four
rectangles (2 in each visual field) which were either white or
black and either horizontal or vertical. The black rectangles were
the targets and only one or two appeared in the display. After a
brief pattern mask, one black rectangle was presented and the
subject had to indicate whether this probe rectangle matched a
target. When targets were isolated to a single hemisphere,
performance was worse when there were two targets rather than one
target ún object-based selection effect. Overall, the right
hemisphere outperformed the left hemisphere in object-based
selection. Moreover, when one target was presented to each
hemisphere simultaneously, there appeared to be competition or
gating between the two hemispheres with again, the right hemisphere
having an advantage. Together the data suggests that, contrary to
previous research, it is the right hemisphere rather than the left
hemisphere that is specialised for object-based selective
attention.
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