School of Psychology, University of Liverpool, Liverpool, England
Sponsorship: The author's research is supported by the United Kingdom Biotechnology and Behavioural Sciences Research Council.
Correspondence and rtequests for reprints to Professor T.C. Kirkham, School of Psychology, University of Liverpool, Eleanor Rathbone Building, Bedford Street South Liverpool, L69 7ZA, England.
e-mail: [email protected]
Received 13 June 2005 Accepted 26 July 2005