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Cerebral Cortex 1995; 5:1-11
© Oxford University Press 1995

Feature Article

Sequence Seeking and Counter Streams: A Computational Model for Bidirectional Information Flow in the Visual Cortex

Shimon Ullman

Department of Brain and Cognitive Science, MIT, Cambridge, Massachusetts and Department of Applied Mathematics, The Weizmann Institute Rehovot, Israel 76100

Correspondence should be addressed to Shimon Ullman, Department of Applied Mathematics and Computer Science, The Weizmann Institute of Science, P.O. Box 266, Rehovot 76100, Israel

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.


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