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Evidence that smooth pursuit velocity, not eye position, modulates alpha and beta oscillations in human middle temporal cortex

Dunkley, Benjamin T., Freeman, Tom C. A., Muthukumaraswamy, Suresh D. and Singh, Krish D. 2015. Evidence that smooth pursuit velocity, not eye position, modulates alpha and beta oscillations in human middle temporal cortex. Human Brain Mapping 36 (12) , pp. 5220-5232. 10.1002/hbm.23006

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Abstract

Suppression of 5–25 Hz oscillations have been observed in MT1 during pursuit eye move- ments, suggesting oscillations that play a role in oculomotor control and/or the integration of extrareti- nal signals during pursuit. The amplitude of these rhythms appears to covary with head-centered eye position, but an alternative is that they depend on a velocity signal that lags the movement of the eyes. To investigate, we explored how alpha and beta amplitude changes related to ongoing eye move- ment depended on pursuit at different eccentricities. The results revealed largely identical patterns of modulation in the alpha and beta amplitude, irrespective of the eccentricity at which the pursuit eye movement was performed. The signals we measured therefore do not depend on head-centered posi- tion. A second experiment was designed to investigate whether the alpha and beta oscillations depended on the direction of pursuit, as opposed to just speed. We found no evidence that alpha or beta oscillations depended on direction, but there was a significant effect of eye speed on the magni- tude of the beta suppression. This suggests distinct functional roles for alpha and beta suppression in pursuit behavior.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Psychology
Cardiff University Brain Research Imaging Centre (CUBRIC)
Subjects: R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
Publisher: Wiley
ISSN: 1065-9471
Date of First Compliant Deposit: 30 March 2016
Date of Acceptance: 16 September 2015
Last Modified: 16 Mar 2020 00:13
URI: http://orca.cf.ac.uk/id/eprint/84509

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