[1] Karolinska Inst, Dept Physiol & Pharmacol, S-17177 Stockholm, Sweden
[2] Boston Univ, Sch Med, Dept Neurol, Boston, MA 02118 USA
[3] Trinity Coll, Dept Psychol, Hartford, CT 06106 USA
[4] Trinity Coll, Neurosci Program, Hartford, CT 06106 USA
[5] Fac Med & Pharm, CNRS, FRE2735, IFRMP 23, F-76183 Rouen, France