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The Journal of Neuroscience, 1999, 19:RC3:1-7

RAPID COMMUNICATION
Modal Behavior of Cortical Neural Networks during Visual Processing

David M. Senseman¹ and Kay A. Robbins²

Cajal Neuroscience Research Center, Divisions of ¹ Life Sciences and ² Computer Science, The University of Texas at San Antonio, San Antonio, Texas 78249

The network behavior of cortical cells during the processing of a light flash was characterized in an isolated, but functionally intact, turtle visual system. Rapid changes in intracellular membrane potential were monitored optically using a voltage-sensitive dye (VSD). Spatially coherent changes in membrane potential were determined by subjecting high-speed movies of the VSD signals to Karhunen-Loéve decomposition. In all experimental trials analyzed (n > 50), coherent activity was restricted to a small number of similar spatial patterns or modes. At least four modes (M_1,1, M_1,2, M_2,1, and M_2,2) have an organizational structure similar to the normal modes of a vibrating membrane (drum). This empirical observation of modal activity provides a useful framework for analyzing the macroscopic behavior of cortical networks.

Key words: cerebral cortex; visual cortex; pyramidal cell; neural network; voltage-sensitive dye; turtle

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Copyright © 1999 Society for Neuroscience  0270-6474/99/$05.00/0

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