title: Phonological grouping is specifically affected in cerebellar patients: a verbal fluency study.
abstract: OBJECTIVE
  Recent clinical and functional neuroimaging evidence points towards a cerebellar role in verbal production. At present it is not clear how the cerebellum participates in language production. The aim was to investigate the influence of cerebellar lesions on verbal fluency abilities with specific focus on the verbal searching strategies employed by patients with cerebellar damage.
  
  
  METHODS
  Twenty five patients with focal or degenerative cerebellar disease and 14 control subjects were tested in a timed verbal fluency task requiring word production under forced (phonemic or semantic) conditions. To analyse the verbal searching strategy employed, semantic and phonemic cluster analyses were also performed.
  
  
  RESULTS
  Performances of cerebellar patients were comparable with those of controls in the semantic task; conversely their performances were significantly impaired when tested in the letter task. Cluster analysis results showed that the verbal fluency impairment is linked to specific damage of phonemically related retrieval strategies.
  
  
  CONCLUSIONS
  Cerebellar damage impairs verbal fluency by specifically affecting phonemic rule performances while sparing semantic rule ones. These findings underline the importance of the cerebellar computing properties in strategy development in the linguistic domain.
authors.affiliation: Department of Psychology, University of Rome "La Sapienza", Rome, Italy. leggio@caspur.it
authors.forename: M G
authors.initials: MG
authors.lastname: Leggio
authors.forename: M C
authors.initials: MC
authors.lastname: Silveri
authors.forename: L
authors.initials: L
authors.lastname: Petrosini
authors.forename: M
authors.initials: M
authors.lastname: Molinari
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001931:Brain Mapping; D002526:Cerebellar Diseases / Q000175:diagnosis* / Q000503:physiopathology; D002528:Cerebellar Neoplasms / Q000175:diagnosis* / Q000503:physiopathology; D004292:Dominance, Cerebral / Q000502:physiology; D005260:Female; D006801:Humans; D008297:Male; D011939:Mental Recall / Q000502:physiology; D008875:Middle Aged; D009460:Neurologic Examination; D009483:Neuropsychological Tests; D010700:Phonetics; D012660:Semantics; D013068:Speech Production Measurement; D014705:Verbal Behavior / Q000502:physiology*; D014706:Verbal Learning / Q000502:physiology