Abstract:
:A magnetic stimulus applied to the human scalp over the motor cortex causes a short latency contraction of contralateral limb muscles. This is presumed to result from the indirect excitation of corticospinal neurons with monosynaptic connections to motoneurons. The excitability of these cortical neurons can be estimated from the magnitude of the postsynaptic potentials produced in spinal motoneurons by a given magnetic stimulus. In man the characteristics of these postsynaptic potentials can be derived from changes in the firing probability of single motor units. When a subject increases the level of a sustained voluntary contraction the excitability of the corticospinal neurons estimated in this way becomes less. We conclude that the additional synaptic input to motoneurons required to maintain a stronger muscle contraction comes from fiber systems other than the population of fast corticospinal neurons activated by magnetic stimulation.
journal_name
Exp Brain Resjournal_title
Experimental brain researchauthors
Brouwer B,Ashby P,Midroni Gdoi
10.1007/BF00247369subject
Has Abstractpub_date
1989-01-01 00:00:00pages
649-52issue
3eissn
0014-4819issn
1432-1106journal_volume
74pub_type
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