A focus on the brain as an organic biological entity that grows and develops as the organism does is a prerequisite to a neurally-plausible theory of how image schemata structure language. Convergent evidence from the cognitive neurosciences has begun to establish the neural basis of image schemata as dynamic activation patterns that are shared across the neural maps of the sensorimotor cortex. First, I discuss the numerous experimental studies on normal subjects that, coupled with recent neurological studies of body-part language deficits in patients, have begun to establish that the sensorimotor cortices are crucial to the semantic comprehension of bodily action terms and sentences. Second, by tracing the cognitive and neural development of image schemata through both animal neuroanatomical studies and human neuroimaging studies, I review the neurobiologically plausible bases for image schemata. I propose that Edelman's theory of secondary neural repertoires is the likeliest process to account for how integrative areas of the sensorimotor cortex can develop both sensorimotor and image schematic functions. Third, I assess the evidence from recent fMRI and ERP experiments showing that literal and metaphoric language stimuli activate areas of sensorimotor cortex consonant with the image schemata hypothesis. I conclude that these emerging bodies of evidence show how the image schematic functions of the sensorimotor cortex structure linguistic expression and metaphor.
In this paper I review some of the theoretical issues surrounding metaphor, and trace them through the context of the cognitive neuroscience debate. Metaphor, like all figurative language, has typically been explained as a secondary linguistic process which is a function taking place on literal language. However this explanation does not fit well with some of the recent work on right hemisphere processing of language or recent cognitive studies, both of which suggest that the figurative and literal language are processed simultaneously and share much substructure. In seeking ways to operationalize the Lakoff and Johnson view of conceptual metaphor as a constitutive cognitive phenomenon, I begin to spell out what kinds of theoretical predictions the Lakoff Johnson model would make on the neurophysiological levels af cognitive investigation. I conclude by offering some thoughts on new directions of research using these methods, and by reassessing the philosophical basis of these matters.
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