The usual method for studying mental processes entails taking words in linguistics -- or concepts in logic -- and establishing the connections and relationships between them. Thus, the traditional approach to semantic problems -- those of meaning and understanding -- is through language. Most researchers agree that thought and language are generated by deep-seated semantic structures determined by the structure of the brain. Until now, however, all attempts at constructing semantic models have been made on the basis of linguistic material alone, without taking brain structure into account....