“…Condit, 1996;Gibbons, 2007;Graham, 2009;Johnson, 2008), but also as a conceptual resource (eg. Davis, 2008;Fahnestock, 2005;Lunceford, 2007;Pruchnic, 2008). Even in 1990, it was already possible for Jeffrey Walker to observe that, "Periodically in recent years, neurological research has been invoked as an emerging and important source of knowledge for the rhetorician" (Walker, 1990, 301; for example, see Gregg, 1984).…”