Abstract
Nowadays, the basic concept of the classical theory of aphasia, proposed by Wernicke in 19th century, is supported by many researchers in spite of the several counterarguments. One of the main objections against the classical theory claims that aphasia is the secondary effect of the disorder of conceptual thinking, but this argument is recently invalidated by the study of the deaf aphasic patients using ASL who show the dissociation between linguistic and nonlinguistic gestual systems. In this paper, the classical theory of aphasia is reevaluated from the view point of the basic physiological process of the brain.
