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Functional specificity of callosal connections in tree shrew striate cortex.

Publication ,  Journal Article
Bosking, WH; Kretz, R; Pucak, ML; Fitzpatrick, D
Published in: J Neurosci
March 15, 2000

Although callosal connections have been shown to link extensive regions of primary visual cortex, the distribution of these connections with respect to the map of visual space and the map of orientation preference remains unclear. Here we combine optical imaging of intrinsic signals with injection of fluorescent microspheres to assess the functional specificity of callosal connections in the tree shrew. By imaging both hemispheres simultaneously while presenting a series of spatially restricted stimuli, we find that a substantial region of visual space is represented bilaterally. Each hemisphere includes a representation of the ipsilateral visual field that is highly compressed relative to that of the contralateral visual field and is most extensive in the lower visual field, where approximately 30(o) of central visual space are represented bilaterally. Callosal connections extend throughout the region of bilateral representation but terminate in a spatially restricted manner that links visuotopically corresponding sites in the two hemispheres. In contrast, callosal connections appear to terminate without regard for the map of orientation preference, showing little sign of the orientation-specific modular and axial specificity that is characteristic of long-range horizontal connections. By coordinating the activity in the two hemispheres in a way that preserves nearest neighbor relationships, callosal connections may best be viewed as elements of local circuits that operate within a single bilateral representation of visual space.

Duke Scholars

Published In

J Neurosci

DOI

EISSN

1529-2401

Publication Date

March 15, 2000

Volume

20

Issue

6

Start / End Page

2346 / 2359

Location

United States

Related Subject Headings

  • Visual Pathways
  • Visual Fields
  • Visual Cortex
  • Tupaiidae
  • Space Perception
  • Optics and Photonics
  • Neurology & Neurosurgery
  • Male
  • Image Processing, Computer-Assisted
  • Functional Laterality
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Bosking, W. H., Kretz, R., Pucak, M. L., & Fitzpatrick, D. (2000). Functional specificity of callosal connections in tree shrew striate cortex. J Neurosci, 20(6), 2346–2359. https://doi.org/10.1523/JNEUROSCI.20-06-02346.2000
Bosking, W. H., R. Kretz, M. L. Pucak, and D. Fitzpatrick. “Functional specificity of callosal connections in tree shrew striate cortex.J Neurosci 20, no. 6 (March 15, 2000): 2346–59. https://doi.org/10.1523/JNEUROSCI.20-06-02346.2000.
Bosking WH, Kretz R, Pucak ML, Fitzpatrick D. Functional specificity of callosal connections in tree shrew striate cortex. J Neurosci. 2000 Mar 15;20(6):2346–59.
Bosking, W. H., et al. “Functional specificity of callosal connections in tree shrew striate cortex.J Neurosci, vol. 20, no. 6, Mar. 2000, pp. 2346–59. Pubmed, doi:10.1523/JNEUROSCI.20-06-02346.2000.
Bosking WH, Kretz R, Pucak ML, Fitzpatrick D. Functional specificity of callosal connections in tree shrew striate cortex. J Neurosci. 2000 Mar 15;20(6):2346–2359.

Published In

J Neurosci

DOI

EISSN

1529-2401

Publication Date

March 15, 2000

Volume

20

Issue

6

Start / End Page

2346 / 2359

Location

United States

Related Subject Headings

  • Visual Pathways
  • Visual Fields
  • Visual Cortex
  • Tupaiidae
  • Space Perception
  • Optics and Photonics
  • Neurology & Neurosurgery
  • Male
  • Image Processing, Computer-Assisted
  • Functional Laterality