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Do we have direct access to retinal image motion during smooth pursuit eye movements?

Freeman, Tom C. A., Champion, Rebecca Anne, Sumnall, Jane H. and Snowden, Robert Jefferson 2009. Do we have direct access to retinal image motion during smooth pursuit eye movements? Journal of Vision 9 (1) , 33. 10.1167/9.1.33

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Abstract

One way the visual system estimates object motion during pursuit is to combine estimates of eye velocity and retinal motion. This questions whether observers need direct access to retinal motion during pursuit. We tested this idea by varying the correlation between retinal motion and objective motion in a two-interval speed discrimination task. Responses were classified according to three motion cues: retinal speed (based on measured eye movements), objective speed, and the relative motion between pursuit target and stimulus. In the first experiment, feedback was based on relative motion and this cue fit the response curves best. In the second experiment, simultaneous relative motion was removed but observers still used the sequential relative motion between pursuit target and dot pattern to make their judgements. In a final experiment, feedback was given explicitly on the retinal motion, using online measurements of eye movements. Nevertheless, sequential relative motion still provided the best account of the data. The results suggest that observers do not have direct access to retinal motion when making perceptual judgements about movement during pursuit.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Psychology
Subjects: B Philosophy. Psychology. Religion > BF Psychology
R Medicine > RE Ophthalmology
Uncontrolled Keywords: motion ; Speed constancy ; Smooth pursuit eye movement ; Extra-retinal signals
Publisher: Association for Research in Vision and Ophthalmology
ISSN: 1534-7362
Last Modified: 03 Dec 2018 16:51
URI: http://orca-mwe.cf.ac.uk/id/eprint/11524

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