 Contemporary philosophical thinking about mental imagery comes close to this way of defining mental imagery (see Nanay forthcoming for a summary). Gregory Currie, for example says that “episodes of mental imagery are occasions on which the visual system is driven off-line, disconnected from its normal sensory inputs” (Currie 1995, p. 26, see also Kind 2001, Richardson 1969, Currie and Ravenscroft 2002, but see also Section 1.2 below and see Fazekas et al. 2021, for more on the concept of offline perception).