 Like subsumption, most versions of co-consciousness require experiential parts (James, who accepted NEP and thus had an unusual conception of co-consciousness, is an exception). In addition to a problem of lack of neutrality, this requirement faces the problem that some forms of unified consciousness do not seem to involve multiplicity of items, unified consciousness of self for example. If there is no multiplicity of items, there is nothing to enter into a ‘co’-relationship. 