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Oculomotor Distraction by Signals Invisible to the Retinotectal and Magnocellular Pathways

Bompas, Aline Elisabeth Dominique and Sumner, Petroc 2009. Oculomotor Distraction by Signals Invisible to the Retinotectal and Magnocellular Pathways. Journal of Neurophysiology 102 (4) , pp. 2387-2395. 10.1152/jn.00359.2009

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Abstract

Irrelevant stimulus onsets interfere with saccade planning to other stimuli, prolonging saccadic latency (the oculomotor distractor effect) or eliciting directional errors (saccadic capture). Such stimulus-driven interference has been associated with the retinotectal pathway, the direct pathway from retina to superior colliculus. Consistent with this theory, the distractor effect has not been found for stimuli visible only to the short-wave cones in the retina (S cones), which are thought not to contribute to the retinotectal pathway. However, S-cone signals are generally slower than luminance signals and such differences in temporal dynamics have not been taken into account when investigating the saccadic distractor effect. Here, by varying the delay between target and distractor, we found that S-cone stimuli do in fact produce a distractor effect, but the optimal delay is generally different from that for luminance distractors. The temporal dynamics of the distractor effect conform to a general framework of saccadic competition that takes sensory transmission time into account. Additionally, we observe that S-cone stimuli are able to produce saccadic capture in our paradigm. We conclude that stimulus-driven oculomotor interference does not rely on the retinotectal pathway, or indeed the magnocellular pathway, which is also blind to our S-cone stimuli.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Psychology
Subjects: B Philosophy. Psychology. Religion > BF Psychology
R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
R Medicine > RE Ophthalmology
Publisher: The American Physiological Society
ISSN: 0022-3077
Last Modified: 04 Jun 2017 04:02
URI: http://orca.cf.ac.uk/id/eprint/31170

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