[1] Univ London Goldsmiths Coll, Dept Psychol, London SE14 6NW, England
[2] Otto Von Guericke Univ, Ctr Adv Imaging, D-39120 Magdeburg, Germany
[3] Otto Von Guericke Univ, Dept Neurol 2, D-39120 Magdeburg, Germany
[4] MRC, Cognit & Brain Sci Unit, Cambridge CB2 2EF, England