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Bilateral neuromagnetic activation of human primary sensorimotor cortex in preparation and execution of unilateral
C Babiloni1, F Carducci, V Pizzella
1Istituto di Fisiologia umana -2 Cattedra di Biofisica, Sezione di EEG ad alta risoluzione, Universita' degli Studi di Roma 'La Sapienza', P.le Aldo Moro 5, 00185, Rome, Italy. babilonic@axrma.uniromal.it
Abstract:
Extracranial magnetoencephalographic activity was separately recorded (25 channels) from bilateral primary sensorimotor cortex (M1-S1) of normal right-handers during unilateral finger movements. Standard dipole analysis indicated only a contralateral M1-S1 source for first movement-evoked field (MEF1) peaking at about 115 ms after electromyographic onset. However, the subtraction of the magnetic field generated by this source from the recorded magnetic field disclosed a low-amplitude ipsilateral central-parietal MEF1 that was explained by an ipsilateral M1-S1 source.