Metaphor and Mental DualityStevanHarnadauthorGiven certain premises, there are both empirical and logical reasons for
expecting a certain division of labor in the processing of information by the
human brain: a functional bifurcation into what may be called, to a first
approximation, "verbal" and "nonverbal" modes of information- processing.
This dichotomy is not quite satisfactory, however, for metaphor, which in its
most common guise is a literary, and hence a fortiori a "verbal" phenomenon,
may in fact be more a function of the "nonverbal" than the "verbal" mode.Perceptual Cognitive PsychologyPsycholinguistics1982Hillsdale NJ: ErlbaumBook Chapter