Perceptual completion across the vertical meridian and the role of early visual cortex. Pillow, J. & Rubin, N. Neuron, 33(5):805-13, 2002.
abstract   bibtex   
Perceptual completion can link widely separated contour fragments and interpolate illusory contours (ICs) between them. The mechanisms underlying such long-range linking are not well understood. Here we report that completion is much poorer when ICs cross the vertical meridian than when they reside entirely within the left or right visual hemifield. This deficit reflects limitations in cross-hemispheric integration. We also show that the sensitivity to the interhemispheric divide is unique to perceptual completion: a comparable task which did not require completion showed no across-meridian impairment. We propose that these findings support the existence of specialized completion mechanisms in early visual cortical areas (V1/V2), since those areas are likely to be more sensitive to the interhemispheric divide.
@Article{Pillow2002,
  author   = {Jonathan Pillow and Nava Rubin},
  journal  = {Neuron},
  title    = {Perceptual completion across the vertical meridian and the role of early visual cortex.},
  year     = {2002},
  number   = {5},
  pages    = {805-13},
  volume   = {33},
  abstract = {Perceptual completion can link widely separated contour fragments
	and interpolate illusory contours (ICs) between them. The mechanisms
	underlying such long-range linking are not well understood. Here
	we report that completion is much poorer when ICs cross the vertical
	meridian than when they reside entirely within the left or right
	visual hemifield. This deficit reflects limitations in cross-hemispheric
	integration. We also show that the sensitivity to the interhemispheric
	divide is unique to perceptual completion: a comparable task which
	did not require completion showed no across-meridian impairment.
	We propose that these findings support the existence of specialized
	completion mechanisms in early visual cortical areas (V1/V2), since
	those areas are likely to be more sensitive to the interhemispheric
	divide.},
  keywords = {Animals, Form Perception, Humans, Optical Illusions, Psychological Tests, Visual Cortex, Visual Fields, Visual Perception, 11879643},
}

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