 Others have argued that functionalism best suits non-reductive physicalism in the following sense: It maintains the naturalist’s intuition that there is unity among the underlying property-realizers which are all ultimately physical; hence, token identity theory is true. Nevertheless, it opens the possibility to accommodate the threat of multiple realizability in a particular way: Functional kinds can be multiply realized, and, hence, they can be regarded as being distinct from the lower-level physical properties. Moreover, if a pragmatic dimension is incorporated in the conception of functionalism, functionalism seems to contradict reductionist interpretations; it may be impossible as a matter of practice to specify the relevant roles using only the resources of the lower-level theories (cf. Van Gulick 2010).