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Abstract:
Abstract: The change blindness literature suggests that
successful detection of changes in visual scenes requires focused
attention, and other behavioral work shows that this kind of visual
memory is limited in capacity. Using a trial based fMRI design and
a change detection paradigm, we compared delay activity during
maintenance of single feature and binding information. On each
trial a display of colored squares flashed briefly and, after two
seconds, a test display appeared which was either exactly the same
as the original or differed in the color, location, or binding of
two single features. An auditory cue before each trial indicated
whether color, location, either feature, or the binding might
change. All four memory trial types in comparison to a sensorimotor
control showed delay period activity in extrastriate, temporal and
posterior parietal areas, suggesting that posterior structures
involved in visual perception are also involved in visual memory.
In a direct contrast of delay activity for trials in which either
feature might change with delay activity when the binding might
change, memory for binding information specifically involved
several areas of lateral frontal cortex and more superior parietal
areas. The results suggest that binding information is not
automatically maintained in visual memory and that binding
maintenance involves frontal cortex in addition to posterior
structures.
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