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From the Playfair Neuroscience Unit, The Toronto Hospital, Western Division, University of Toronto, Ontario, Canada.
Address correspondence and reprint requests to Dr. Peter Ashby, Playfair Neuroscience Unit, The Toronto Hospital, Western Division, University of Toronto, 399 Bathurst Street, Toronto, Ontario M5T 2S8, Canada.
OBJECTIVE: To examine inhibition in the human motor cortex before and during voluntary movements.
METHODS: The balance between the excitation and inhibition of corticospinal neurons in the human motor cortex was tested by conditioning the motor evoked potentials (MEP) evoked in forearm muscles by transcranial magnetic stimulation with a preceding subthreshold stimulus delivered through the same coil.
RESULTS: When normal individuals (n = 9) made a tonic wrist extension, inhibition of the forearm extensor MEP decreased, whereas that of the forearm flexors was unchanged. When these individuals made a tonic wrist flexion, inhibition of the forearm flexor MEP diminished, whereas that of the forearm extensors was unchanged. When normal individuals (n = 10) made a phasic wrist extension in response to an auditory signal, inhibition of the extensor MEP began to decline about 95 msec before the onset of the agonist EMG activity.
CONCLUSIONS: The changes in balance of excitation and inhibition of corticospinal neurons associated with a voluntary movement precede the movement and are directed at the corticospinal neurons projecting to the agonists. These changes may help to select the population of cortical neurons responsible for the movement.
Key words: Pyramidal tract—Magnetic stimulation—Motor cortex—Voluntary movement—Human.
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