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J Neurophysiol (September 3, 2008). doi:10.1152/jn.01376.2007 Free Article
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Submitted on December 20, 2007
Accepted on August 30, 2008

The Human Dorsal Stream Adapts to Real Actions and 3D Shape Processing: A Functional Magnetic Resonance Imaging Study

Grzegorz Kroliczak1*, Teresa D. McAdam2, Derek J. Quinlan3, and Jody C. Culham2

1 Department of Psychology, University of Oregon, Eugene, Oregon, United States
2 Department of Psychology, University of Western Ontario, London, Canada
3 Neuroscience Program, University of Western Ontario, London, Canada

* To whom correspondence should be addressed. E-mail: gregk{at}uoregon.edu.

We tested whether or not the control of real actions in an ever-changing environment would show any dependence on prior actions elicited by instructional cues a few seconds before. To this end, adaptation of the functional magnetic resonance imaging signal was measured while human participants sequentially grasped three-dimensional objects in an event-related design, using grasps oriented along the same or a different axis of either the same or a different object shape. We found that the bilateral anterior intraparietal sulcus (aIPS), an area previously linked to the control of visually-guided grasping, along with other areas of the intraparietal sulcus, the left supramarginal gyrus (SMG) and the right mid superior parietal lobe (mid-SPL) showed clear adaptation following both repeated grasps and repeated objects. In contrast, the left ventral premotor cortex (PMv), and the bilateral dorsal premotor cortex (PMd), the two premotor areas often linked to response selection, action planning and execution, showed only grasp-selective adaptation. These results suggest that, even in real action guidance, parieto-frontal areas demonstrate differential involvement in visuomotor processing dependent on whether the action or the object has been previously experienced.




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