title: Dual task performance in Huntington's disease: A comparison of choice reaction time tasks.
abstract: OBJECTIVE
  This study investigated whether dual tasks make disproportionately high demands in Huntington's disease (HD) compared with controls, and also tested the Multiple Resources Theory.
  
  
  METHODS
  Thirteen HD participants and 13 controls completed 2 dual task sets that varied in difficulty and complexity: Set 1 paired simple choice reaction time (RT) with digit forward, and Set 2 paired complex choice RT with digit backward.
  
  
  RESULTS
  We found that HD participants were overall slower; however, although they maintained similar levels of accuracy in the simple choice RT tasks with controls, their accuracy decreased in the complex choice RT tasks. In addition, we found that HD participants were more susceptible to speed-accuracy trade-offs. Despite that, they did not show greater dual task costs than controls.
  
  
  CONCLUSIONS
  Overall, our findings do not support the Multiple Resources Theory, but they do provide some support for the Unitary Resource Theory and the attentional impairment hypothesis.
authors.affiliation: School of Psychological Sciences, Monash University.
authors.forename: Eleftheria
authors.initials: E
authors.lastname: Vaportzis
authors.affiliation: School of Psychological Sciences, Monash University.
authors.forename: Nellie
authors.initials: N
authors.lastname: Georgiou-Karistianis
authors.affiliation: School of Psychological Sciences, Monash University.
authors.forename: Andrew
authors.initials: A
authors.lastname: Churchyard
authors.affiliation: School of Psychological Sciences, Monash University.
authors.forename: Julie C
authors.initials: JC
authors.lastname: Stout
mesh_terms: D000368:Aged; D002755:Choice Behavior; D005260:Female; D006801:Humans; D006816:Huntington Disease / Q000523:psychology*; D008297:Male; D008875:Middle Aged; D009483:Neuropsychological Tests; D011597:Psychomotor Performance; D011930:Reaction Time