Accession Number : ADA318495

Title :   Vector-based Integration of Local and Long-range Information in Visual Cortex.

Descriptive Note : Memorandum rept.,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE ARTIFICIAL INTELLIGENCE LAB

Personal Author(s) : Somers, David C. ; Todorov, Emanuel V. ; Siapas, Athanassios G. ; Sur, Mriganka

PDF Url : ADA318495

Report Date : NOV 1995

Pagination or Media Count : 14

Abstract : Integration of inputs by cortical neurons provides the basis for the complex information processing performed in the cerebral cortex. Here, we propose a new analytic framework for understanding integration within cortical neuronal receptive fields. Based on the synaptic organization of cortex, we argue that neuronal integration is a systems-level process better studied in terms of local cortical circuitry than at the level of single neurons, and we present a method for constructing self-contained modules which capture (nonlinear) local circuit interactions. In this framework, receptive field elements naturally have dual (rather than the traditional unitary) influence since they drive both excitatory and inhibitory cortical neurons. This vector-based analysis, in contrast to scalar approaches, greatly simplifies integration by permitting linear summation of inputs from both 'classical' and 'extraclassical' receptive field regions. We illustrate this by explaining two complex visual cortical phenomena, which are incompatible with scalar notions of neuronal integration.

Descriptors :   *NEURAL NETS, *NERVE CELLS, *VISUAL CORTEX, *NEUROPHYSIOLOGY, VISUAL PERCEPTION, SCALAR FUNCTIONS, RECEPTOR SITES(PHYSIOLOGY), INFORMATION PROCESSING, CEREBRAL CORTEX, CUES(STIMULI), NEUROBIOLOGY, SYNAPSIS.

Subject Categories : Anatomy and Physiology
      Medicine and Medical Research

Distribution Statement : APPROVED FOR PUBLIC RELEASE