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Abstract:
Abstract: A typical scene contains many different objects
that compete for neural representation due to the limited
processing capacity of the visual system. The competition among
multiple objects in visual cortex can be biased by both bottom-up
sensory-driven mechanisms and top-down influences, such as
selective attention. Functional brain imaging studies reveal that
biasing signals due to selective attention can modulate neural
activity in visual cortex in several ways, both in the absence and
in the presence of visual stimulation. Although the competition
among stimuli for representation is ultimately resolved within
visual cortex, the source of top-down biasing signals derives from
a network of areas in frontal and parietal cortex.
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