Sequence-Seeking and Counter Streams: A Model for Information Processing in the Cortex

Abstract

This paper presents a model for the general flow of processing in the neocortex. The basic process, called 'sequence-seeking,' is a search for a sequence of mappings, or transformations, linking source and target representations. The search is bi-directional, 'bottom-up' as well as 'top-down, ' and it explores in parallel a large number of alternative sequences. This operation is implemented in a structure termed 'counter streams,' in which multiple sequences are explored along two separate, complementary pathways which seeking to meet. The first part of the paper discusses the general sequence- seeking scheme and a number of related processes, such as the learning of successful sequences, context effects, and the use of 'express lines' and partial matches. The second part discusses biological implications of the model in terms of connections within and between cortical areas. The model is compared with existing data, and a number of new predictions are proposed.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1991
Accession Number
ADA260354

Entities

People

  • Shimon Ullman

Organizations

  • Massachusetts Institute of Technology

Tags

Communities of Interest

  • Cyber
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Artificial Intelligence
  • Brain
  • Cells
  • Central Nervous System
  • Cerebral Cortex
  • Cognitive Science
  • Computer Vision
  • Content Addressable Memory
  • Control Systems
  • Information Processing
  • Information Systems
  • Nervous System
  • Neural Pathways
  • Neurons
  • Neurosciences
  • Pattern Recognition
  • Rodents

Readers

  • Applied Combinatorial Optimization and Logic Circuit Design.
  • Artificial Intelligence
  • Neuroscience