<Li> Concepts as abilities, where concepts are abilities peculiar to cognitive agents (mental states) </Li> <Li> Concepts as Fregean senses (see sense and reference), where concepts are abstract objects, as opposed to mental objects and mental states </Li> <P> Concepts can be organized into a hierarchy, higher levels of which are termed "superordinate" and lower levels termed "subordinate". Additionally, there is the "basic" or "middle" level at which people will most readily categorize a concept . For example, a basic - level concept would be "chair", with its superordinate, "furniture", and its subordinate, "easy chair". </P> <P> Within the framework of the representational theory of mind, the structural position of concepts can be understood as follows: Concepts serve as the building blocks of what are called mental representations (colloquially understood as ideas in the mind). Mental representations, in turn, are the building blocks of what are called propositional attitudes (colloquially understood as the stances or perspectives we take towards ideas, be it "believing", "doubting", "wondering", "accepting", etc .). And these propositional attitudes, in turn, are the building blocks of our understanding of thoughts that populate everyday life, as well as folk psychology . In this way, we have an analysis that ties our common everyday understanding of thoughts down to the scientific and philosophical understanding of concepts . </P>

The most fundamental component of the concept of number is the process of