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The Journal of Neuroscience, October 31, 2007, 27(44):11949-11959; doi:10.1523/JNEUROSCI.3477-07.2007

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Behavioral/Systems/Cognitive
Medial Prefrontal Theta Bursts Precede Rapid Motor Responses during Visual Selective Attention

Arnaud Delorme,¹ Marissa Westerfield,² and Scott Makeig¹

¹Swartz Center for Computational Neuroscience, and ²Department of Neuroscience, University of California San Diego, La Jolla, California 92093

Correspondence should be addressed to Arnaud Delorme, Swartz Center for Computational Neuroscience, Institute for Neural Computation, University of California San Diego, La Jolla, CA 92093-0961. Email: arno{at}sccn.ucsd.edu

After visual target stimuli presented infrequently at a covertly attended location, quicker speeded button presses immediately followed a larger positive (P3f) ramp in averaged electroencephalographic (EEG) recordings from the forehead. We show this peak in the mean response time locked to the button press to be principally composed of triphasic, primarily low-theta band (4.5 Hz) complexes preceding but only partially phase-locked to the button press, with larger complexes preceding quicker motor responses. For 10 of 15 subjects, independent component analysis of the unaveraged 31-channel data identified a temporally independent medial frontal EEG process contributing to these phenomena. Low-resolution tomographic modeling localized related components of two 253-channel data sets to medial frontal polar cortex (BA32/10). The far-frontal low-theta complexes and concomitant mean P3f positivity may index cortical activity induced by paralimbic processes involved in disinhibiting impulsive motor responses to rewarding or goal-fulfilling stimuli or events.

Key words: theta; reaction time; VMPFC; EEG; ICA; medial prefrontal cortex

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Received May 9, 2006; revised Feb. 27, 2007; accepted Sept. 3, 2007.

Correspondence should be addressed to Arnaud Delorme, Swartz Center for Computational Neuroscience, Institute for Neural Computation, University of California San Diego, La Jolla, CA 92093-0961. Email: arno{at}sccn.ucsd.edu

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				B. Ballanger Top-Down Control of Saccades as Part of a Generalized Model of Proactive Inhibitory Control J Neurophysiol, November 1, 2009; 102(5): 2578 - 2580. [Abstract] [Full Text] [PDF]

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