Movement-related potentials during the performance of a motor task II: Cerebral areas activated during learning of the task |
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Authors: | E Yom-Tov A Grossman G F Inbar |
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Institution: | (1) Faculty of Electrical Engineering, Technion – Israel Institute of Technology, Technion City, Haifa 32000, Israel, IL |
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Abstract: | Movement-related potentials (MRPs) recorded from the brain are thought to vary during learning of a motor task. However,
since MRPs are recorded at a very low signal-to-noise ratio, it is difficult to measure these variations. In this study we
attempt to remove most of the accompanying noise thus enabling the tracking of transient phenomena in MRPs recorded during
learning of a motor task. Subjects performed a simple motor task which required learning. A modified version of the matching
pursuit algorithm was used in order to remove a significant portion of the electroencephalographic noise overlapping the MRPs
recorded in the experiment. Small groups of MRPs were then averaged according to experimental parameters. Our results show
that the power of the MRPs does not decay uniformly during learning. Instead, there is a significant peak in their power
after 4 or 5 repetitions of the task. This peak is noticeable especially in electrodes placed over the prefrontal region of
the cortex at times subsequent to the actual movement. The observed pattern of activity may indicate problem solving related
to comprehension of the force against which the user performed the task. It is possible that this problem solving occurs in
the prefrontal cortex.
Received: 27 December 2000 / Accepted in revised form: 26 April 2001 |
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