Event Abstract Back to Event Activated area of imagined movement: MEG study Takehiro Uda1*, Naohiro Tsuyuguchi1, Yoshihito Shigihara2, Yuzo Terakawa1 and Kenji Ohata1 1 Osaka City University Graduate School of Medicine, Department of Neurosurgery, Japan 2 Osaka City University Graduate School of Medicine, Department of Physiology, Japan Objective: To detect the activated area in motor imaginary using magnetoencephalography. Materials and Methods: Twenty healthy volunteers participated in this study. The subjects attempted to clench their right hand on a visual cue. The timing of the cue was used as the trigger and 100 trials were performed. The data were analyzed by the equivalent current dipole (ECD) procedure and b-band (15-30 Hz) event-related desynchronization (ERD). The estimated location of the ECD, peak of the distribution of b-band ERD sources, and hand motor cortex in T1 weighted MR images were compared in a three-dimensional coordinate system. To compare the motor imaginary and motor execution, the hand clenching task was assigned consecutively in the same subjects and analyzed by the same methods. Results: In motor imaginary, event-related activations were recognized in the contralateral frontal cortex approximately 50 – 250 ms after the cue in ECD and during 0 – 600 ms after the cue in b-band ERD. These activated areas were well-matched with the motor cortex in MRI, and considered to show activation in the primary motor area. There were no differences in the coordinate axis in comparing with the motor execution task. However, both of the analyses had low sensitivities for detection of the primary motor area. The low sensitivity in ECD was thought to be because the timing of the cue and the execution of motor imaginary could not be matched precisely. In ERD, this was because there were some cases in which significant ERD did not emerge, and widespread ERD in the occipital area by the visual stimulus masked the ERD around the motor cortex. Conclusions: We detected the activated area during motor imaginary by two different methods of analysis in magnetoencephalography, i.e., ECD and ERD. The location of the area matched that of the primary motor cortex. This corresponded well with the results of previous functional MRI studies. Conference: Biomag 2010 - 17th International Conference on Biomagnetism , Dubrovnik, Croatia, 28 Mar - 1 Apr, 2010. Presentation Type: Poster Presentation Topic: Neurocognition and Functional Connectivity Citation: Uda T, Tsuyuguchi N, Shigihara Y, Terakawa Y and Ohata K (2010). Activated area of imagined movement: MEG study. Front. Neurosci. Conference Abstract: Biomag 2010 - 17th International Conference on Biomagnetism . doi: 10.3389/conf.fnins.2010.06.00327 Copyright: The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers. They are made available through the Frontiers publishing platform as a service to conference organizers and presenters. The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated. Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed. For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions. Received: 06 Apr 2010; Published Online: 06 Apr 2010. * Correspondence: Takehiro Uda, Osaka City University Graduate School of Medicine, Department of Neurosurgery, Osaka, Japan, nsgtak@gmail.com Login Required This action requires you to be registered with Frontiers and logged in. To register or login click here. Abstract Info Abstract The Authors in Frontiers Takehiro Uda Naohiro Tsuyuguchi Yoshihito Shigihara Yuzo Terakawa Kenji Ohata Google Takehiro Uda Naohiro Tsuyuguchi Yoshihito Shigihara Yuzo Terakawa Kenji Ohata Google Scholar Takehiro Uda Naohiro Tsuyuguchi Yoshihito Shigihara Yuzo Terakawa Kenji Ohata PubMed Takehiro Uda Naohiro Tsuyuguchi Yoshihito Shigihara Yuzo Terakawa Kenji Ohata Related Article in Frontiers Google Scholar PubMed Abstract Close Back to top Javascript is disabled. Please enable Javascript in your browser settings in order to see all the content on this page.