 In order to overcome the difficulties faced by trying to define “mental simulation of” in terms of either replication or reuse, philosophers have built on the insights of both RES and  REU  and have proposed definitions that combine replication and reuse elements (Currie &amp; Ravenscroft 2002; in recent years, Goldman himself seems to have favoured a mixed account; see Goldman 2012a). Here is one plausible definition: