 On Mellor’s model, the mechanism by which time-order is perceived is sensitive to the time at which perceptions occur, but indifferent to their content (what the perceptions are of). Daniel Dennett (1991) proposes a different model, on which the process is time-independent, but content-sensitive. For example, the brain may infer the temporal order of events by seeing which sequence makes sense of the causal order of those events. One of the advantages of Dennett’s model is that it can account for the rather puzzling cases of ‘backwards time referral’, where perceived order does not follow the order of perceptions. (See Dennett 1991 for a discussion of these cases, and also Roache 1999 for an attempt to reconcile them with Mellor’s account.)