Is there a specific executive capacity for dual task coordination? Evidence from Alzheimer's disease

Robert H Logie, Gianna Cocchini, Sergio Delia Sala, Alan Baddeley

Research output: Contribution to journalArticlepeer-review


Three experiments compared groups of Alzheimer's disease (AD) patients and healthy older and younger participants on visuospatial tracking and digit sequence recall, as single tasks and performed concurrently. In Experiment 1, tasks were performed concurrently with very low demand relative to span. Only the AD patients showed a dual task deficit. In Experiment 2, single task demand was manipulated on each task from below span to above span for each individual. All groups showed the same performance reductions with increasing demand. In Experiment 3, demand on 1 task was constant, whereas demand on the concurrent task was varied. AD patients showed a clear dual task deficit but were no more sensitive than control groups to varying demand. Results suggest an identifiable cognitive resource for dual task coordination within a multiple component working memory system.
Original languageEnglish
Pages (from-to)504-13
Number of pages10
Issue number3
Publication statusPublished - 2004


  • Adult
  • Aged
  • Aged, 80 and over
  • Alzheimer Disease
  • Attention
  • Female
  • Humans
  • Male
  • Mental Recall
  • Mental Status Schedule
  • Middle Aged
  • Motion Perception
  • Neuropsychological Tests
  • Orientation
  • Pattern Recognition, Visual
  • Problem Solving
  • Psychomotor Performance
  • Reaction Time
  • Serial Learning

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