Cited by 95Visual perception and processing mechanismsNeural dynamics and brain functionNeural Networks and Applications

How many maps are there in visual cortex?

Swindale, N. V.·2000·Cerebral Cortex

Abstract

In addition to a topographic map of the retina, mammalian visual cortex contains superimposed, orderly periodic maps of features such as orientation, eye dominance, direction of motion and spatial frequency. There is evidence that these maps are overlaid so as to ensure that all combinations of the different parameters are represented as uniformly as possible across visual space. However, it is unknown to what extent geometrical factors limit the number of periodic maps which might simultaneously be present, given this constraint. This paper attempts to investigate the question by using a dimension reduction model to generate maps of simple, many- dimensional feature spaces onto a model two-dimensional cortex. The feature space included a model retina, plus N binary variables, corresponding to parameters such as ocular dominance or spatial frequency. The results suggest that geometrical factors do not sharply limit the ability of the cortex to represent combinations of parameters in spatially superimposed maps of similar periodicity. Considerations of uniform coverage suggest an upper limit of six or seven maps. A higher limit, of about nine or ten, may be imposed by the numbers of neurons (or minicolumns) available to represent each of 2(N) features within a given small region of cortex.

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  • The circuits derived in the paper provide no explanation for observed cortical maps.

    “Hence, the circuits here provide no explanation for observed cortical maps [70],[71].”

    From Towards a mathematical theory of cortical micro-circuits (2009) · cites this paper as [71]

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  1. Mountcastle VB (1978) In: The mindful brain (Schmitt FO, ed.), pp. 7-50. Cambridge, MA: MIT Press.

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Authors
Swindale, N. V.
Affiliations
University of British Columbia (CA)
Corresponding author
Swindale, N. V.
Venue
Cerebral Cortex
Published
2000-07-01
Volume
10
Issue
7
Pages
633-643
ISSN
  • 1047-3211 (ISSN-L)
  • 1460-2199
OpenAlex
W2116881182
Cited by
94
References
36
Citations by year
2026: 2 · 2025: 1 · 2024: 1 · 2022: 2 · 2021: 2 · 2019: 1 · 2018: 2 · 2017: 2 · 2016: 6 · 2015: 6 · 2014: 2 · 2013: 4 · 2012: 6
FWCI
2.63
Type
journal article
Language
en
Open access
closed
Locations
  • Cerebral Cortex (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Visual perception and processing mechanisms
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural dynamics and brain function
  • Physical Sciences › Computer Science › Artificial Intelligence › Neural Networks and Applications
Keywords
visual cortex, periodic maps, feature maps, ocular dominance, orientation maps, minicolumns, feature space representation, uniform coverage
MeSH terms
Algorithms, Brain Mapping, Functional Laterality, Models, Neurological, Retina, Visual Cortex

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