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J Neurophysiol (February 1, 2003). 10.1152/jn.00562.2002
Submitted on Submitted 15 July 2002; accepted in final form 26 September 2002
1Department of Physiology, University of Western Ontario, London, Ontario N6A 5C1; 2The Laboratory for Magnetic Resonance Research, The John P. Robarts Research Institute, London, Ontario N6A 5K8: and 3Department of Psychology, University of Western Ontario, London, Ontario N6A 5C2, Canada
DeSouza, Joseph F. X.,
Ravi S. Menon, and
Stefan Everling.
Preparatory Set Associated With Pro-Saccades and
Anti-Saccades in Humans Investigated With Event-Related fMRI. J. Neurophysiol. 89: 1016-1023, 2003. Previous
studies have shown that the BOLD functional MRI (fMRI) signal is
increased in several cortical areas when subjects perform anti-saccades
compared with pro-saccades. It remains unknown, however, whether this
increase is due to an increased cortical motor signal for anti-saccades
or due to differences in preparatory set between pro- and anti-saccade
trials. To address this question, we measured event-related fMRI in a
paradigm that allowed us to separate instruction-related brain activity
from saccade-related brain activity. In this paradigm, the instruction
to either generate a pro-saccade or an anti-saccade was conveyed by a
switch in the color of the central fixation stimulus and preceded the
presentation of a peripheral stimulus by either 6, 10, or 14 s.
Cortical areas were functionally mapped using the general linear model
comparing standard pro- and anti-saccade blocks with fixation blocks.
When the trials were aligned on the onset of the instruction stimulus, bilateral frontal eye fields and right hemisphere dorsolateral prefrontal cortex showed an increased signal during the instruction period on anti-saccade trials as compared with pro-saccade trials. When
the trials were aligned on the movement stimulus and the instruction
period activity was subtracted, there were no differences between pro-
and anti-saccades. This finding suggests that the increased cortical
activation found in previous blocked designs originates predominately
from differences in preparatory set and not from differences in the
motor signal between pro- and anti-saccades.
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