Processing of shape information in human peripheral visual fields is
impeded beyond what can be expected by poor spatial resolution. Visual
crowding, the inability to identify objects in clutter, has been shown
to be the primary factor limiting shape perception in peripheral
vision. Despite the well-documented effects of crowding, its
underlying causes remain poorly understood. Given that spatial
attention both facilitates learning of image statistics and directs
saccadic eye movements, we propose that the acquisition of image
statistics in peripheral visual fields is confounded by eye-movement
artifacts. Specifically, the image statistics acquired under a
peripherally deployed spotlight of attention are systematically biased
by saccade-induced image displacements. These erroneously represented
image statistics lead to inappropriate contextual interactions in the
periphery and cause crowding.
http://www.nature.com/neuro/journal/v15/n3/full/nn.3021.html
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