Our minds are severely limited in how much information they can
extensively process, in spite of being massively parallel at the
visual end. When people attempt to track moving objects, only a
limited number can be tracked, which varies with display
parameters. Associated experiments indicate that spatial selection
and updating has higher capacity than selection and updating of
features such as color and shape, and is mediated by processes
specific to each cerebral hemisphere, such that each hemifield has
its own spatial tracking limit. These spatial selection processes
act as a bottleneck that gate subsequent processing. To improve our
understanding of this bottleneck, future work should strive to
avoid contamination of tracking tasks by high-level cognition.
While we are far from fully understanding how attention keeps up
with multiple moving objects, what we already know illuminates the
architecture of visual processing and offers promising directions
for new discoveries.
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