The ipsilateral field representation in the striate cortex of the opossum

Experimental Brain Research
Eliane VolchanL G Gawryszewski

Abstract

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 ...Continue Reading

Citations

Aug 1, 1992·Journal of Neurocytology·J N Hokoç, A M Moraes
Jun 24, 2009·Brain, Behavior and Evolution·Peiyan Wong, Jon H Kaas
Nov 20, 2002·Neuroreport·Leticia OliveiraCarlos Eduardo Rocha-Miranda
Jan 1, 1994·Experimental Brain Research·A Pereira JúniorC E Rocha-Miranda
Mar 1, 1997·Neuroscience and Behavioral Physiology·G G Bondar
Aug 19, 1996·The Journal of Comparative Neurology·K A Fritsches, M G Rosa

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