Can verb morphology be primed in agrammatic aphasia?

In order to investigate the underlying source of verb inflection errors in agrammatic aphasia, we used a morphological priming paradigm to elicit picture descriptions from nine Broca’s aphasic individuals. The primes were either identical to the target verb form, inflectionally congruent (sang-skipped, walked-skipped) or inflectionally incongruent (walks-skipped). A significant facilitation was found only with primes that were congruent for tense, irrespective of morphological overlap (sang-skipped). A disadvantage was found for incongruent primes. The results suggest that the most likely source of the verb inflection deficit in agrammatism is insufficient activation of the appropriate tense information