Geometrical and topological relationships between multiple functional maps in cat primary visual cortex

Dae Shik Kim, Yoshitaka Matsuda, Kenichi Ohki, Ayako Ajima, Shigeru Tanaka

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)


The mammalian striate cortex is organized such that the receptive field properties of neighboring neurons change gradually across the cortical surface, forming so-called cortical maps. The presence of such maps has been demonstrated in different species of mammals for several parameters characterizing the visual space: retinotopy, ocular dominance, orientation, direction of motion and spatial frequency. In this study we used the optical imaging of intrinsic signals to simultaneously record the multiple functional maps in the same animal in order to obtain a comprehensive set of rules that govern mutual dependencies among the functional maps. Our results indicate that while orientation, direction and ocular dominance are represented on the cortex in a mutually dependent manner, the representation of spatial frequency is independent of the other types of cortical representations. The presence and/or absence of mutual dependence among the multiple functional maps are suggested to provide an important clue for the understanding of the development of visual cortical information representation in neonatal animals.

Original languageEnglish
Pages (from-to)2515-2522
Number of pages8
Issue number12
Publication statusPublished - Aug 20 1999
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Neuroscience(all)


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