Evidence of midline retinal nasotemporal overlap in healthy humans: a model for foveal sparing in hemianopia?

Marzi, C.A., Mancini, F., Sperandio, I. and Savazzi, S. (2009) Evidence of midline retinal nasotemporal overlap in healthy humans: a model for foveal sparing in hemianopia? Neuropsychologia, 47 (13). pp. 3007-3011. ISSN 1873-3514

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Abstract

The existence of midline retinal nasotemporal overlap in humans is controversial. Here we used the Poffenberger paradigm and monocular vision to assess the existence of a midline retinal area projecting to both hemispheres and of a possible differential contribution of the two hemiretinae. When brief visual stimuli were presented at 1 degrees eccentricity they were responded to equally quickly with either hand while at 6 degrees the hand on the same side as the stimulated hemifield was consistently faster than the contralateral hand. This pattern of results is consistent with a nasotemporal overlap at 1 degrees and a complete lateralization at 6 degrees . Both hemiretinae contribute to the overlap area which can be considered as responsible for foveal sparing in hemianopic patients.

Item Type: Article
Faculty \ School: Faculty of Social Sciences > School of Psychology
Related URLs:
Depositing User: Pure Connector
Date Deposited: 29 Oct 2015 13:00
Last Modified: 21 Apr 2020 17:41
URI: https://ueaeprints.uea.ac.uk/id/eprint/54910
DOI: 10.1016/j.neuropsychologia.2009.05.007

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