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The Pattern and Functional Significance of Long-Range Interactions in Human Visual Cortex

Uri Polat , Anthony M. Norcia , and Dov Sagi

The Smith-Kettlewell Eye Research Institute
2232 Webster Street
San-Francisco, CA 94115, USA

Department of Neurobiology, Brain Research
The Weizmann Institute of Science
Rehovot 76100, Israel

{uri, amn}@skivs.ski.org, dubi@nisan.weizmann.ac.il

Abstract

In this chapter we will review recent observations on long-range excitatory and inhibitory interactions. Such effects are found in both psychophysical and evoked potential experiments, and they depend on contrast, offset, and collinearity. Possible mechanisms for these effects are suggested, and a functional role in establishing Gestalt phenomena is outlined.

Introduction
Lateral Facilitation and Suppression
- Psychophysical Observations
- Neurophysiological Observations
Contrast and Offset Dependency
Possible Mechanisms
Conclusion
References

Next: Introduction Up: Lateral Interactions in the Cortex: Structure and Function

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