Sequence seeking and counter streams: a computational model for bidirectional information flow in the visual cortex.
A computational model is proposed for some general aspects of information flow in the visual cortex. The basic process, called "sequence seeking," is a search for a sequence of mappings, or transformations, linking source and target patterns. The process has two main characteristics: it is bidirectional, bottom-up as well as top-down, and it explores in parallel a large number of alternative sequences. This operation is performed in a "counter streams" structure, in which multiple sequences are explored along two complementary pathways, an ascending and a descending one, seeking to meet. A biological embodiment of this model in cortical circuitry is proposed. The model serves to account for known aspects of cortical interconnections and to derive new predictions.
Ullman
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Department of Brain and Cognitive Science, MIT, Cambridge, Massachusetts, USA.
D000818:Animals; D003198:Computer Simulation; D006801:Humans; D008959:Models, Neurological; D014793:Visual Cortex / Q000502:physiology*