This volume brings to light: (1) studies on the effects of different ways of acquiring and teaching a second language; (2) psychological studies on lexical organization in the bilingual brain; (3) neurological research including more than 100 case studies of polyglot aphasics; and (4) original experimental research on language lateralization in bilinguals. A cross-disciplinary exploration of issues in bilingualism includes studies of psycholinguistic phenomena such as interference, transfer, and translation; sociolinguistic phenomena such as age and manner of acquisition of the second language; and neurologic considerations such as cerebral organization for the two language systems, potential switch mechanisms, and differential cerebral lateralization for language. In the concluding chapter, the neuropsychological and neurolinguistic evidence are synthesized. It is concluded that language is organized in the brain of a bilingual in a manner different from that which might have been predicted by studies of cerebral organization for language in monolinguals. Evidence is presented that knowledge of the neurological differences and similarities between monolinguals and bilinguals will be essential to the future of bilingual education. (AP/JB)