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Orientational influences of layer V of visual area 18 upon cells in layer V of area 17 in the cat cortex

Experimental Brain Research volume 96, pages 212–220 (1993)Cite this article

Abstract

We examined the orientation tuning curves of 86 cells located in layer V of area 17, before, during, and after focal blockade of a small (300-μm diameter) region of near-retinotopic register in layer V of area 18 of quantitatively established orientation preference. Such focal blockade revealed three distinct populations of area 17 layer V cells-cells with decreased responses to stimuli of some orientations (21%), cells with increased responses to stimuli of some orientations (43%), and cells unaffected by the focal blockade (36%). These effects were clearcut, reproducible, and generally directly related to the known receptive field properties of the cell recorded in area 18 at the center of the zone of blockade. These effects were also analyzed in terms of alterations in orientation bandwidth in the cells in area 17 as a result of the blockade-bandwidth increases (22%) and decreases (24%) were found; however, these changes were essentially unrelated to the measured receptive field properties. Inhibitory and excitatory effects were most pronounced when the regions in areas 17 and 18 were of like ocular dominance and were of similar orientation preference. Inhibitory effects (suggesting a normally excitatory input) were most dependent upon the similarity of receptive fields; excitatory effects (suggesting a normally inhibitory input) were less heavily dependent.

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Author notes

  1. J. M. Alonso

    Present address: Laboratory of Neurobiology, The Rockefeller University, New York, USA

Affiliations

  1. Laboratorios de Ciencias Visuales, Departamento de Fisiologia, Universidad de Santiago de Compostela, E-15705, Santiago de Compostela, Spain

    J. M. Alonso, J. Cudeiro, R. Pérez, F. Gonzalez & C. Acuña

  2. INEF-Galicia, La Coruña, Spain

    J. Cudeiro

Authors
  1. J. M. Alonso
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  2. J. Cudeiro
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  3. R. Pérez
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  4. F. Gonzalez
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  5. C. Acuña
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Alonso, J.M., Cudeiro, J., Pérez, R. et al. Orientational influences of layer V of visual area 18 upon cells in layer V of area 17 in the cat cortex. Exp Brain Res 96, 212–220 (1993). https://doi.org/10.1007/BF00227101

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  • DOI: https://doi.org/10.1007/BF00227101

Key words

  • Orientation
  • Layer V
  • Area 18
  • Area 17
  • Parallel processing
  • Cat