Accession Number : ADA260354
Title : Sequence-Seeking and Counter Streams: A Model for Information Processing in the Cortex
Descriptive Note : Memorandum rept.
Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE ARTIFICIAL INTELLIGENCE LAB
Personal Author(s) : Ullman, Shimon
Report Date : Dec 1991
Pagination or Media Count : 57
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.
Descriptors : *INFORMATION PROCESSING , *CEREBRAL CORTEX , PREDICTIONS , MODELS , PROCESSING , STRUCTURES , TARGETS , SEQUENCES , VISUAL CORTEX , DIRECTIONAL , OPERATION , FLOW , NUMBERS , BOTTOM , PAPER , TRANSFORMATIONS
Subject Categories : Anatomy and Physiology
Distribution Statement : APPROVED FOR PUBLIC RELEASE