Cross-Linguistic Study of Morphological Errors in Aphasia: Evidence from English, Greek, and Polish

The investigation of errors related to the presence or absence of morphemes found in the speech of aphasics has been the target of research ever since aphasia was described in linguistic terms. The investigations initially examined the occurrence or nonoccurrence of morphological errors alone or in combination with syntactical errors. The performance of patients was mainly characterized by the omission of function words, grammatical inflections and derivations, or both. Studies of morphological errors found in aphasic speech have focused primarily on investigating the origin of these errors, as well as the information they provide about the organization of grammar in the brain.