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"One of the intriguing abilities that language users have is that of high-level reference, or the ability to refer to things or states of being that are not in the immediate realm of the speaker. This ability is often related to theory of mind, or an awareness of the other as a being like the self with individual wants and intentions. According to Chomsky, Hauser and Fitch (2002), there are six main aspects of this high-level reference system: * Theory of mind * Capacity to acquire nonlinguistic conceptual representations, such as the object/kind distinction * Referential vocal signals * Imitation as a rational, intentional system * Voluntary control over signal production as evidence of intentional communication * Number representation"

Article written in 1945 by Vannevar Bush. In his article, Bush described a theoretical machine he called a "memex," which was to enhance human memory by allowing the user to store and retrieve documents linked by associations. This associative linking was very similar to what is known today as hypertext. Ted Nelson who later did pioneering work with hypertext credited Bush as his main influence. Others, such as J.C.R. Licklider and Douglas Engelbart have also paid homage to Bush.