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Cerebral Cortex Advance Access published online on March 6, 2008
Cerebral Cortex, doi:10.1093/cercor/bhn001
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© The Author 2008. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

Segregation of Visual Selection and Saccades in Human Frontal Eye Fields

C.-H. Juan1,2, N. G. Muggleton3, O. J. L. Tzeng2,4, D. L. Hung1,2,4, A. Cowey5 and V. Walsh3

1 Institute of Cognitive Neuroscience, National Central University, Jhongli 320, Taiwan, 2 Laboratories for Cognitive Neuroscience, National Yang-Ming University, Taipei 112, Taiwan, 3 Institute of Cognitive Neuroscience and Department of Psychology, University College London, London WC1N 3AR, UK, 4 Institute of Linguistics, Academia Sinica, Taipei 115, Taiwan, 5 Department of Experimental Psychology, University of Oxford, Oxford OX1 3UD, UK

Address correspondence to C.-H. Juan. Email: chijuan{at}cc.ncu.edu.tw.

The premotor theory of attention suggests that target processing and generation of a saccade to the target are interdependent. Temporally precise transcranial magnetic stimulation (TMS) was delivered over the human frontal eye fields, the area most frequently associated with the premotor theory in association with eye movements, while subjects performed a visually instructed pro-/antisaccade task. Visual analysis and saccade preparation were clearly separated in time, as indicated by 2 distinct time points of TMS delivery that resulted in elevated saccade latencies. These results show that visual analysis and saccade preparation, although frequently enacted together, are dissociable processes.

Key Words: eye movements • transcranial magnetic stimulation • vision


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