1. From the Department of Physiology (V.E.-H., C.P., J. Drapeau, R.C., H.G., L.V., A.C.), University of Montreal, and the Montreal Heart Institute (V.E.-H., J. Dupuis, C.P., J. Drapeau, A.C.), Montreal, Quebec, Canada, and the Department of Neurology (L.M.), Stony Brook University, Stony Brook, NY.