Callosal and association neurons in the cortical space: A spectral analysis approach

Roberto Caminiti, Paul B. Johnson, Antonio Urbano, Apostolos P. Georgopoulos, Scott Zeger

Research output: Contribution to journalArticlepeer-review

Abstract

The tangential distributions of callosal neurons of area 5 projecting homotopically to the contralateral hemisphere and of association neurons of areas 4 and 6 projecting to ipsilateral area 5 were determined in the macaque monkey by using neuroanatomical methods based on the retrograde transport of horseradish peroxidase. Both distributions were studied qualitatively through 2-dimensional reconstructions of the cortical areas of origin and quantitatively through a spectral analysis. This approach facilitated the characterization of the spatial periodicities contained in these distributions revealing that, in area 5, callosal neurons were organized in bands of various shapes and width; these bands were composed of more discrete clusters of cells. In the frontal lobe, association neurons projecting to ipsilateral area 5 were arranged similarly. This study suggests that a common principle underlies the tangential organization of both callosal and association projecting cells in different cortical areas and emphasizes a basic similarity of interhemispheric and intrahemispheric connections.

Original languageEnglish (US)
Pages (from-to)193-201
Number of pages9
JournalBehavioural Brain Research
Volume30
Issue number2
DOIs
StatePublished - Sep 15 1988

Keywords

  • Association efferent zone
  • Callosal efferent zone
  • Fourier analysis
  • Tangential distribution of efferent cortical neurons

ASJC Scopus subject areas

  • Behavioral Neuroscience

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