title: Further evidence of auditory extinction in aphasia.
abstract: OBJECTIVE
  Preliminary research (Shisler, 2005) suggests that auditory extinction in individuals with aphasia (IWA) may be connected to binding and attention. In this study, the authors expanded on previous findings on auditory extinction to determine the source of extinction deficits in IWA.
  
  
  METHODS
  Seventeen IWA (M(age) = 53.19 years) and 17 neurologically intact controls (M(age) = 55.18 years) participated. Auditory stimuli were spoken letters presented in a free-field listening environment. Stimuli were presented in single-stimulus stimulation (SSS) or double-simultaneous stimulation (DSS) trials across 5 conditions designed to determine whether extinction is related to binding, inefficient attention resource allocation, or overall deficits in attention. All participants completed all experimental conditions.
  
  
  RESULTS
  Significant extinction was demonstrated only by IWA when sounds were different, providing further evidence of auditory extinction. However, binding requirements did not appear to influence the IWA's performance.
  
  
  CONCLUSIONS
  Results indicate that, for IWA, auditory extinction may not be attributed to a binding deficit or inefficient attention resource allocation because of equivalent performance across all 5 conditions. Rather, overall attentional resources may be influential. Future research in aphasia should explore the effect of the stimulus presentation in addition to the continued study of attention treatment.
authors.affiliation: University of Georgia, Athens, USA. rshisler@uga.edu
authors.forename: Rebecca Shisler
authors.initials: RS
authors.lastname: Marshall
authors.forename: Alexandra
authors.initials: A
authors.lastname: Basilakos
authors.forename: Kim
authors.initials: K
authors.lastname: Love-Myers
mesh_terms: D000161:Acoustic Stimulation / Q000379:methods; D000328:Adult; D000368:Aged; D001039:Aphasia, Broca / Q000503:physiopathology*; D001041:Aphasia, Wernicke / Q000503:physiopathology*; D001288:Attention / Q000502:physiology*; D001303:Auditory Cortex / Q000503:physiopathology; D005108:Extinction, Psychological / Q000502:physiology*; D005260:Female; D007839:Functional Laterality / Q000502:physiology; D006309:Hearing / Q000502:physiology; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D013067:Speech Perception / Q000502:physiology; D020521:Stroke / Q000503:physiopathology*