 What binds together the intentional horizon of a given indexical experience? According to Husserl, all of the (actual or potential) experiences constituting that horizon share a sense of identity through time, which sense he labels as the determinable X they belong to. As a first approximation, two experiences of a given subject belong to the same determinable X if and only if the subject believes them to represent the same object. (For a related criterion of intersubjective identity of determinable X, see Beyer 2000, sec. 7.) Hence, experiences belonging to a determinable X must be accompanied by at least one higher-order belief. This view fits in well with the thesis (shared, at least in part, by so-called dispositional higher-order belief theories of consciousness) that intentional experiences automatically give rise to (i.e., motivate) momentary dispositions to make corresponding reflective higher-order judgements, based on something like inner perception, thus constituting a form of implicit or “pre-reflective self-consciousness” (to use Sartre’s term).