 According to some philosophers (e.g., Horgan and Tienson 2002; Kriegel 2002, 2013; Siewert 1998), there is a some content of experience that is constitutively determined by the experience’s phenomenology alone (Horgan and Tienson 2002, p. 524). Horgan and Tienson call this thesis phenomenal intentionality (See entry on  phenomenal intentionality).  A consequence of the thesis is that phenomenology enjoys explanatory priority over intentionality. Proponents of phenomenal intentionality take phenomenology as a primitive notion, which cannot be reduced to content, and then try to explain (at least some kinds of) content in terms of it.