Does nocturnality drive binocular vision? octodontine rodents as a case study
Author
dc.contributor.author
Vega Zúñiga, Tomás
Author
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Medina, Felipe S.
Author
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Fredes, Felipe
Author
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Zuniga, Claudio
Author
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Severín, Daniel
Author
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Palacios, Adrián G.
Author
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Karten, Harvey J.
Author
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Mpodozis Marín, Jorge
Admission date
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2019-03-15T16:06:08Z
Available date
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2019-03-15T16:06:08Z
Publication date
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2013
Cita de ítem
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PLoS ONE, Volumen 8, Issue 12, 2018,
Identifier
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19326203
Identifier
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10.1371/journal.pone.0084199
Identifier
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https://repositorio.uchile.cl/handle/2250/166122
Abstract
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Binocular vision is a visual property that allows fine discrimination of in-depth distance (stereopsis), as well as enhanced light and contrast sensitivity. In mammals enhanced binocular vision is structurally associated with a large degree of frontal binocular overlap, the presence of a corresponding retinal specialization containing a fovea or an area centralis, and well-developed ipsilateral retinal projections to the lateral thalamus (GLd). We compared these visual traits in two visually active species of the genus Octodon that exhibit contrasting visual habits: the diurnal Octodon degus, and the nocturnal Octodon lunatus. The O. lunatus visual field has a prominent 100° frontal binocular overlap, much larger than the 50° of overlap found in O. degus. Cells in the retinal ganglion cell layer were 40% fewer in O. lunatus (180,000) than in O. degus (300,000). O. lunatus has a poorly developed visual streak, but a well developed area centralis, located centrally near the optic disk (p