The ipsilateral field representation in the striate cortex of the opossum

Reference axes for the visuotopic study of the opossum's striate cortex were estimated from corresponding binocular response fields using multi-unit recording. These central binocular axes (CBA) were derived from experimental data based on the concept that corresponding receptive fields for eac...

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Bibliographic Details
Published in:Experimental brain research 1988-01, Vol.73 (2), p.297-304
Main Authors: VOLCHAN, E, BERNARDES, R. F, ROCHA-MIRANDA, C. E, GLEISER, L, GAWRYSZEWSKI, L. G
Format: Article
Language:English
Subjects:
Animals
Biological and medical sciences
Didelphis marsupialis
Eye and associated structures. Visual pathways and centers. Vision
Functional Laterality - physiology
Fundamental and applied biological sciences. Psychology
Opossums - physiology
Photic Stimulation
Retina - cytology
Retina - physiology
Retinal Ganglion Cells - physiology
Vertebrates: nervous system and sense organs
Visual Cortex - physiology
Visual Fields
Visual Pathways - physiology
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Summary:Reference axes for the visuotopic study of the opossum's striate cortex were estimated from corresponding binocular response fields using multi-unit recording. These central binocular axes (CBA) were derived from experimental data based on the concept that corresponding receptive fields for each eye should be mostly in register under natural conditions. Vertical reference meridians, orthogonal to these axes, define a contralateral and an ipsilateral field for each eye with respect to the recording site. An ipsilateral field representation was observed for both eyes in the striate cortex at the transition zone with peristriate. Maximal values for the center and border of ipsilateral receptive fields were, respectively, 8 and 20 degrees for the contralateral eye and 6 and 14 degrees for the ipsilateral eye. An equivalent ipsilateral field representation was found in animals that had the anterior commissure cut prior to the recording session. This suggests that the ipsilateral field of both eyes may be represented in the striate cortex via the ipsilateral optic tract. Additionally, it was observed that the region of higher ganglion cell density in the retina shows a flattened distribution and that the CBA intersects the retina at the temporal aspect of this region.
ISSN:0014-4819
1432-1106
DOI:10.1007/BF00248221