@article{ Grossberg_Raizada00,
  author = {Grossberg, S. and Raizada, R.D.},
  title = {{{C}ontrast-sensitive perceptual grouping and object-based attention
	in the laminar circuits of primary visual cortex}},
  journal = {Vision Res.},
  year = {2000},
  volume = {40},
  pages = {1413--1432},
  abstract = {Recent neurophysiological studies have shown that primary visual cortex,
	or V1, does more than passively process image features using the
	feedforward filters suggested by Hubel and Wiesel. It also uses horizontal
	interactions to group features preattentively into object representations,
	and feedback interactions to selectively attend to these groupings.
	All neocortical areas, including V1, are organized into layered circuits.
	We present a neural model showing how the layered circuits in areas
	V1 and V2 enable feedforward, horizontal, and feedback interactions
	to complete perceptual groupings over positions that do not receive
	contrastive visual inputs, even while attention can only modulate
	or prime positions that do not receive such inputs. Recent neurophysiological
	data about how grouping and attention occur and interact in V1 are
	simulated and explained, and testable predictions are made. These
	simulations show how attention can selectively propagate along an
	object grouping and protect it from competitive masking, and how
	contextual stimuli can enhance or suppress groupings in a contrast-sensitive
	manner.}
}

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