Semantic deficits in amyotrophic lateral sclerosis

Felicity V. C. Leslie, Sharpley Hsieh, Jashelle Caga, Sharon A. Savage, Eneida Mioshi, Michael Hornberger, Matthew C. Kiernan, John R Hodges, James R. Burrell

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Abstract

Objective: To investigate, and establish neuroanatomical correlates of, semantic deficits in amyotrophic lateral sclerosis (ALS) and amyotrophic lateral sclerosis-frontotemporal dementia (ALS-FTD), compared to semantic dementia (SD) and controls. Methods: Semantic deficits were evaluated using a naming and semantic knowledge composite score, comprising of verbal and non-verbal neuropsychological measures of single-word processing (confrontational naming, comprehension, and semantic association) from the Sydney Language Battery (SYDBAT) and Addenbrooke’s Cognitive Examination - Revised (ACE-R). Voxel-based morphometry (VBM) analysis was conducted using the region of interest approach. Results: In total, 84 participants were recruited from a multidisciplinary research clinic in Sydney. Participants included 17 patients with ALS, 19 patients with ALS-FTD, 22 patients with SD and 26 age- and education- matched healthy controls. Significant semantic deficits were observed in ALS and ALS-FTD compared to controls. The severity of semantic deficits varied across the clinical phenotypes; ALS patients were less impaired than ALS-FTD patients, who in turn were not as impaired as SD patients. Anterior temporal lobe atrophy significantly correlated with semantic deficits. Conclusion: Semantic impairment is a feature of ALS and ALS-FTD, and reflects the severity of temporal lobe pathology.
Original languageEnglish
Pages (from-to)46-53
Number of pages8
JournalAmyotrophic Lateral Sclerosis and Frontotemporal Degeneration
Volume16
Issue number1-2
Early online date27 Dec 2014
DOIs
Publication statusPublished - 1 Mar 2015

Keywords

  • Cognitive impairment
  • ALS-FTD
  • semantic

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