Presents data from a positron emission tomographic study in which subjects were asked to produce the past tense forms of regular, irregular and nonce stems. Findings, which support the grammar/lexicon linguistic theories, reveal different amounts and areas of cortical activation in the regular and irregular tasks, as well as significantly…

Clark's 1987 Principle of Contrast seems inconsistent with the synonymy exhibited by inflectional affixes in languages with inflection classes. But if inflection class membership identifies the inflection class of the lexemes to which it attaches, then inflection affixation complies with this principle. Grammatical implications are suggested. (76…