“…Hay & Young, 1982;Ellis, 1986), as well as descendents of it (Brédart, Valentine, Calder & Gassi, 1995;Burton, Bruce & Johnston, 1990;Hanley, 1995. These units have been recruited in explanations of a very wide range of phenomena, for example patterns of priming (Ellis, Young & Flude, 1990;Ellis, Flude, Young & Burton, 1996;Schweinberger, 1996;Young, Hellawell & de Haan, 1988), cross modal person recognition (Hanley & Turner, 2000;Schweinberger, Herholz & Stief, 1997) and certain characteristics of prosopagnosia (Burton, Young, Bruce, Johnston & Ellis, 1991;de Haan, Young & Newcombe, 1987;Young & Burton, 1999). However, despite the theoretical utility of this construct, all the papers cited above remain silent about how it might actually be implemented.…”