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Naso-temporal asymmetry for signals invisible to the retinotectal pathway

Bompas, Aline Elisabeth Dominique, Sterling, T., Rafal, R. D. and Sumner, Petroc 2008. Naso-temporal asymmetry for signals invisible to the retinotectal pathway. Journal of Neurophysiology 100 (1) , pp. 412-421. 10.1152/jn.90312.2008

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Abstract

Monocular viewing conditions show an asymmetry between stimuli presented in the temporal and nasal visual fields in their efficiency for automatically triggering eye saccades and grasping attention. For instance, observers free to make a saccade to one of two stimuli presented together orient preferentially to the temporal stimulus. Such naso-temporal asymmetry (NTA) has been assumed to reflect the asymmetry in the retinotectal pathway to the superior colliculus. We tested this hypothesis using S cone stimuli, which are invisible to the magnocellular and retinotectal pathways. The observed NTA in choice saccades to bilateral stimuli was no less present for S cone stimuli than for luminance stimuli. Additionally, the amplitude of the NTA can be enhanced when S cone signals are added to luminance signals. These results suggest that behavioral NTA in humans is not diagnostic of retinotectal mediation. Furthermore, we found no asymmetries in latency, suggesting that the NTA in saccade choice does not originate simply from a bottom-up asymmetry in any low level visual pathways.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Psychology
Publisher: American Physiological Society
ISSN: 0022-3077
Last Modified: 04 Jun 2017 01:54
URI: http://orca.cf.ac.uk/id/eprint/5555

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