[1] Univ Nottingham, Sch Psychol, Semenyih, Malaysia
[2] Univ Bristol, Dept Archaeol & Anthropol, Bristol, Avon, England
[3] Univ Pretoria, Dept Genet, ZA-0002 Pretoria, South Africa
[4] Brunel Univ, Dept Psychol, Uxbridge UB8 3PH, Middx, England
[5] Univ St Andrews, Sch Psychol, St Andrews, Fife, Scotland
[6] Univ Bristol, Dept Expt Psychol, Bristol, Avon, England