 Reduction may also apply to concepts, where concepts are conceived of loosely as whatever is expressed by a meaningful term, or as the cognitively significance of a linguistic representation, or in Fregean terms as the mode of presentation under which an object is given by a representation. Concepts can be grouped into conceptual frameworks and networks of interconnected concepts. Most notably, there seems to be a fundamental difference between the framework that applies to our psychological states from the first-person perspective, and those that apply to our psychological states from the third-person perspective, such as the framework of neurophysiology.