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Is saccade averaging determined by visual processing or movement planning?

Bhutani, Neha and Ray, Supriya and Murthy, Aditya (2012) Is saccade averaging determined by visual processing or movement planning? In: JOURNAL OF NEUROPHYSIOLOGY, 108 (12). pp. 3161-3171.

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Official URL: http://dx.doi.org/10.1152/jn.00344.2012

Abstract

Bhutani N, Ray S, Murthy A. Is saccade averaging determined by visual processing or movement planning? J Neurophysiol 108: 3161-3171, 2012. First published September 26, 2012; doi:10.1152/jn.00344.2012.-Saccadic averaging that causes subjects' gaze to land between the location of two targets when faced with simultaneously or sequentially presented stimuli has been often used as a probe to investigate the nature of computations that transform sensory representations into an oculomotor plan. Since saccadic movements involve at least two processing stages-a visual stage that selects a target and a movement stage that prepares the response-saccade averaging can either occur due to interference in visual processing or movement planning. By having human subjects perform two versions of a saccadic double-step task, in which the stimuli remained the same, but different instructions were provided (REDIRECT gaze to the later-appearing target vs. FOLLOW the sequence of targets in their order of appearance), we tested two alternative hypotheses. If saccade averaging were due to visual processing alone, the pattern of saccade averaging is expected to remain the same across task conditions. However, whereas subjects produced averaged saccades between two targets in the FOLLOW condition, they produced hypometric saccades in the direction of the initial target in the REDIRECT condition, suggesting that the interaction between competing movement plans produces saccade averaging.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to AMER PHYSIOLOGICAL SOC, USA
Keywords: double-step;hypometric saccade;midway saccade;sequential saccades;saliency map;priority map
Department/Centre: Division of Biological Sciences > Centre for Neuroscience
Depositing User: Francis Jayakanth
Date Deposited: 22 Jan 2013 06:43
Last Modified: 22 Jan 2013 06:43
URI: http://eprints.iisc.ac.in/id/eprint/45675

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