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  Psychophysical Mapping of Orientation Sensitivity in the Human Cortex

Zanker, J., & Braitenberg, V. (1996). Psychophysical Mapping of Orientation Sensitivity in the Human Cortex. In A. Aertsen, & V. Braitenberg (Eds.), Brain theory: biological basis and computational principles (pp. 19-36). Amsterdam, Netherlands: Elsevier.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-EC0A-2 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-0EF3-9
Genre: Book Chapter

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 Creators:
Zanker, JM1, 2, Author              
Braitenberg, V1, 2, Author              
Affiliations:
1Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              
2Former Department Structure and Function of Natural Nerve-Net, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497803              

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 Abstract: Visual space is represented in the human cortex in a highly ordered manner. Each position in the visual field corresponds to a well-defined region in the cortical area VI, and similarly at several subsequent stages of the visual stream. An experiment to determine how far out in the peripheral visual field the orientation of a small line segment can be detected is presented. The fixation target was centered in the stimulus window, and a test bar was presented along the horizontal meridian to the left or to the right of that spot. In the right hemifield of the right eye, the basic pattern of orientation detection performance is overruled by an additional peculiarity appearing at eccentricities between 15° and 18°. In this range, the performance is reduced to zero values for all stimulus contrasts. This behavior was to be expected from the fact that the blind spot is located at a particular position in the visual field, and therefore the subjects should not be able to detect the stimuli at all in that region. The fact can be used to control the reliability of the subjects' fixation by placing one test bar position in the blind spot. It is found that performance for orientation detection of a bar of a given size decreases with decreasing stimulus contrast.

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 Dates: 1996
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1016/B978-044482046-4/50046-8
BibTex Citekey: 609
 Degree: -

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Title: Brain theory: biological basis and computational principles
Source Genre: Book
 Creator(s):
Aertsen, A, Editor            
Braitenberg, V1, Editor            
Affiliations:
1 Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794            
Publ. Info: Amsterdam, Netherlands : Elsevier
Pages: 300 Volume / Issue: - Sequence Number: - Start / End Page: 19 - 36 Identifier: ISBN: 978-0-444-82046-4