PMID: 15223800Jun 30, 2004Paper

TMS over the left posterior parietal cortex prolongs latency of contralateral saccades and convergence

Investigative Ophthalmology & Visual Science
Q Yang, Zoï Kapoula

Abstract

This study explored the role of the left posterior parietal cortex (PPC) in saccades, vergence, and combined saccade-vergence movements by means of transcranial magnetic stimulation (TMS) in humans. TMS was applied over the left PPC for 80, 90, or 100 ms after target onset. In a control experiment, TMS was applied over the primary motor cortex at 90 ms after target onset. Relative to no TMS trials, TMS over the left PPC increased the latency of only certain types of eye movements: saccades to right, convergence, and convergence combined with rightward saccades. It had no such effect on saccades to the left, divergence, saccades combined with divergence, or left saccades combined with convergence. TMS over the vertex had no effect on the latency of any type of eye movement. Thus, the effects of TMS on latency are both area- and eye-movement specific. TMS of the left PPC or the motor cortex did not alter the accuracy of any type of eye movement. The results are in contrast to those of prior studies of the right PPC, which is involved in the initiation of any type of eye movement. The findings suggest that the right PPC is involved primarily in the processing of fixation disengagement, whereas the left PPC provides the signal that...Continue Reading

Citations

Mar 1, 2006·Experimental Brain Research·Suzanne RyanStephen R Jackson
Mar 22, 2008·Experimental Brain Research·Maria Pia BucciZoï Kapoula
Jul 11, 2012·Experimental Brain Research·Michael Vesia, J Douglas Crawford
May 28, 2010·PloS One·Zoi KapoulaJean Sandretto
Apr 30, 2014·Brain Connectivity·Rajbir JaswalTara L Alvarez
Oct 15, 2009·The Neuroscientist : a Review Journal Bringing Neurobiology, Neurology and Psychiatry·Declan J McKeefryAntony B Morland
Jun 9, 2018·PloS One·Monika Wojtczak-KwaśniewskaRob H J Van der Lubbe
May 4, 2012·Journal of Neurophysiology·Wei-Kuang Liang, Chi-Hung Juan
Mar 30, 2021·Physiology & Behavior·Yusei YoshimuraSeiji Ono

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