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- Title
Supplementary motor cortex involvement in reading epilepsy revealed by magnetic source imaging.
- Authors
de beeck, Marc Op; Legros, Benjamin; Gaspard, Nicolas; Bourguignon, Mathieu; Jurysta, Fabrice; Van Bogaert, Patrick; Goldman, Serge; Jousmäki, Veikko; De Tiège, Xavier
- Abstract
Reading epilepsy (RE) is an idiopathic reflex epilepsy syndrome characterized by perioral myoclonic jerks (PMJs) during reading associated with left-dominant frontotemporal spike-wave discharges (SWDs). To better understand the pathophysiology of this syndrome, we studied a 45-year-old patient using magnetic source imaging (MSI). The patient underwent two whole-head magnetoencephalography (MEG) recordings (Elekta Neuromag Oy) within 2 months while reading aloud. Forty-two SWDs associated with PMJs were recorded and averaged with respect to SWDs peak power. Epileptic discharges were then reconstructed using conventional equivalent current dipoles (ECDs) modeling, distributed sources sLORETA modeling, and beamformer approach. These methods identified two brain sources located in the left supplementary motor cortex (SMC) and the left primary sensorimotor face area (PSMFA). The spatiotemporal pattern of the sources was characterized by a cross-talk between these two brain regions, with an initial source in the left SMC. This MSI investigation suggests that RE-PMJs are associated with reading-induced activation of hyperexcitable neurons in the left SMC, followed by secondary propagation to the left PSMFA producing the myoclonus.
- Subjects
MOTOR cortex; EPILEPSY; MAGNETOENCEPHALOGRAPHY; SENSORIMOTOR cortex; PATHOLOGICAL physiology; BRAIN physiology; MAGNETIC resonance imaging
- Publication
Epilepsia (Series 4), 2011, Vol 52, Issue 5, pe31
- ISSN
0013-9580
- Publication type
Article
- DOI
10.1111/j.1528-1167.2011.03050.x