Ullman claims that regular and irregular verb forms (in English) use two very different underlying memory resources. Regular verbs (walk/walked) rely on procedural memory and activate brain areas like Broca’s Area. Irregular verbs (run/ran) rely on semantic memory and activate brain areas in the temporal gyrus. What implications does this have on the way we partition linguistic modules (lexicon vs syntax)? Should these observations about brain activity shape our computational theories about word and sentence formation?
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