Scaling Self-Organizing Maps To Model Large Cortical Networks

James A. Bednar, Amol Kelkar, Risto Miikkulainen

Research output: Contribution to journalArticlepeer-review

Abstract

Self-organizing computational models with specific intracortical connections can explain many functional features of visual cortex, such as topographic orientation and ocular dominance maps. However, due to their computational requirements, it is difficult to use such detailed models to study large-scale phenomena like object segmentation and binding, object recognition, tilt illusions, optic flow, and fovea--periphery interaction. This paper introduces two techniques that make large simulations practical. First, a set of general linear scaling equations for the RF-LISSOM self-organizing model is derived and shown to result in quantitatively equivalent maps over a wide range of simulation sizes. Second, the equations are combined into a new growing map method called GLISSOM, which dramatically reduces the memory and computational requirements of large self-organizing networks. With GLISSOM it should be possible to simulate all of human V1 at the single-column level using existing supercomputers, making detailed computational study of large-scale phenomena possible.
Original languageEnglish
Pages (from-to)275-302
Number of pages28
JournalNeuroinformatics
Publication statusPublished - 2001

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