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J Neurophysiol 97: 3131-3135, 2007. First published January 24, 2007; doi:10.1152/jn.01086.2006
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REPORT

Changes in Spinal Excitability After PAS

Sabine Meunier1,2,3, Heike Russmann1, Marion Simonetta-Moreau4 and Mark Hallett1

1Human Motor Control Section, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland; 2Institut National de la Santé et de la Recherche Médicale (INSERM), U731, Paris, France; 3Université Pierre et Marie Curie-Paris 6, Unité Mixte de Recherche S731, Paris, France; and 4INSERM, U 825, Toulouse F-31059 France, Hôpital Purpan, Fédération de Neurologie, Toulouse, France

Submitted 11 October 2006; accepted in final form 19 January 2007

Repetitive pairing of a peripheral stimulation with a magnetic transcortical stimulation (PAS) is widely used to induce plastic changes in the human motor cortex noninvasively. Based on the contrast between PAS-induced increase of corticospinal excitability and absence of PAS-induced increase of the spinal F wave size, it has been generally accepted that PAS-induced plasticity is cortical in origin. Here, instead of F waves, we used H reflex recruitment curves to assess spinal excitability, and we demonstrate that PAS induces parallel changes in cortical and spinal excitability.

Address for reprint requests and other correspondence: S. Meunier, INSERM U731/UPMC, Service de Réadaptation Fonctionnelle, Hôpital de la Salpêtrière, 47 Bd de l'Hôpital, 75651 Paris Cedex 13, France (E-mail: meunier.sabine{at}free.fr)




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