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Motor Control. 2012 Jul;16(3):353-70. Epub 2012 May 24.

Reduced cortical motor potentials underlie reductions in memory-guided reaching performance.

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  • 1Department of Psychology and Neuroscience, Dalhousie University, Halifax, Nova Scotia, Canada.

Abstract

We used the event-related potential (ERP) methodology to examine differences in neural processing between visually and memory-guided reaches. Consistent with previous findings (e.g., Westwood, Heath, & Roy, 2003), memory-guided reaches undershot veridical target location to a greater extent than their visually guided counterparts. Analysis of the ERP data revealed that memory-guided reaches were associated with reduced potentials over medial-frontal cortex at target presentation and following movement onset. Further, we found that the amplitudes of the potentials over medial-frontal cortex for visually and memory-guided reaches were significantly correlated with the peak accelerations and decelerations of the reaching movements. Our results suggest that memory-guided reaches are mediated by a motor plan that is generated while a target is visible, and then stored in memory until needed--a result counter to recent behavioral theories asserting that memory-guided reaches are planned just before movement onset via a stored, sensory-based target representation.

PMID:
22643098
[PubMed - indexed for MEDLINE]
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