| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH |
|
|
|
|||||||
|
|||||||||
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
1 Kinesiology, University of Illinois at Chicago, Chicago, IL, USA
2 Center for MR Research, University of Illinois at Chicago, Chicago, IL, USA
3 Kinesiology, University of Illinois at Chicago, Chicago, IL, USA; Neurology, University of Illinois at Chicago, Chicago, IL, USA; Bioengineering, University of Illinois at Chicago, Chicago, IL, USA
* To whom correspondence should be addressed. E-mail: court1{at}uic.edu.
Despite an intricate understanding of the neural mechanisms underlying visual and motor systems, it is not completely understood in which brain regions humans transfer visual information into motor commands. Furthermore, in the absence of visual information the retrieval process for motor memory information remains unclear. We report an investigation where visuomotor and motor memory processes were separated from only visual and only motor activation. Subjects produced precision grip force during an fMRI study that included four conditions: rest, grip force with visual feedback, grip force without visual feedback, and visual feedback only. Statistical and subtractive logic analyses segregated the functional process maps. There were three important observations. First, along with the well-established parietal and premotor cortical network, the anterior prefrontal cortex, putamen, ventral thalamus, lateral cerebellum, intermediate cerebellum, and the dentate nucleus were directly involved in the visuomotor transformation process. This activation occurred despite controlling for the visual input and motor output. Second, a detailed topographic orientation of visuomotor to motor/sensory activity was mapped for the premotor cortex, parietal cortex, and the cerebellum. Third, the retrieval of motor memory information was isolated in the dorsolateral prefrontal cortex, ventral prefrontal cortex, and anterior cingulate. The motor memory process did not extend to the SMA and the basal ganglia. The findings provide evidence in humans for a model where a distributed network extends over cortical and subcortical regions to control the visuomotor transformation process used during visually-guided tasks. In contrast, a localized network in the prefrontal cortex retrieves force output from memory during internally-guided actions.
This article has been cited by other articles:
|
|
 |
|
  M. B. Spraker, H. Yu, D. M. Corcos, and D. E. Vaillancourt Role of Individual Basal Ganglia Nuclei in Force Amplitude Generation J Neurophysiol, August 1, 2007; 98(2): 821 - 834. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 K. Jerbi, J.-P. Lachaux, K. N'Diaye, D. Pantazis, R. M. Leahy, L. Garnero, and S. Baillet Coherent neural representation of hand speed in humans revealed by MEG imaging PNAS, May 1, 2007; 104(18): 7676 - 7681. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
A. J. Suminski, S. M. Rao, K. M. Mosier, and R. A. Scheidt Neural and Electromyographic Correlates of Wrist Posture Control J Neurophysiol, February 1, 2007; 97(2): 1527 - 1545. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 J. J. Sosnoff and K. M. Newell Aging, visual intermittency, and variability in isometric force output. J. Gerontol. B. Psychol. Sci. Soc. Sci., March 1, 2006; 61(2): P117 - P124. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
D. E. Vaillancourt, M. A. Mayka, and D. M. Corcos Intermittent Visuomotor Processing in the Human Cerebellum, Parietal Cortex, and Premotor Cortex J Neurophysiol, February 1, 2006; 95(2): 922 - 931. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH |
| Visit Other APS Journals Online |
