[1] Aristotle Univ Thessaloniki, Sch Med, Dept Neurol 1, Thessaloniki 54124, Greece
[2] Lehigh Univ, Psychol Dept, 17 Mem,Dr East, Bethlehem, PA 18015 USA
[3] Univ Cambridge, Dept Theoret & Appl Linguist, English Fac Bldg,Room TR-11,9 West Rd, Cambridge CB3 9DP, England