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Alzheimer Disease l: Introduction01:29

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Alzheimer disease is a chronic, progressive, and irreversible neurodegenerative disorder and the most common cause of dementia in older adults. It leads to gradual neuronal loss, causing cognitive decline, behavioral changes, and loss of functional independence.Risk Factors and EtiologyThe disease is multifactorial. Age is the strongest risk factor, with prevalence doubling every 5 years after age 65. Genetic factors include mutations in genes such as APP, PSEN1, and PSEN2, which are associated...
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Automated, Long-term Behavioral Assay for Cognitive Functions in Multiple Genetic Models of Alzheimer's Disease, Using IntelliCage
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Strategy sequential difficulty effects in Alzheimer patients: a study in arithmetic.

Kim Uittenhove1, Patrick Lemaire

  • 1Laboratoire de Psychologie Cognitive, Centre National de la Recherche Scientifique, and Aix-Marseille Université, Marseille, France.

Journal of Clinical and Experimental Neuropsychology
|December 25, 2012
PubMed
Summary
This summary is machine-generated.

Strategy execution slows after difficult tasks, especially in Alzheimer's disease (AD) patients. This study found significantly increased strategy sequential difficulty effects in AD patients compared to younger and older adults.

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Gerontology

Background:

  • Strategy execution can be influenced by the difficulty of previously executed strategies.
  • Older adults and individuals with Alzheimer's disease (AD) may exhibit distinct patterns in cognitive task performance.

Purpose of the Study:

  • To investigate strategy sequential difficulty (SSD) effects in young adults, older adults, and Alzheimer's disease (AD) patients.
  • To determine if SSD effects are amplified in older adults and particularly in AD patients.

Main Methods:

  • Participants (young, older healthy, and AD patients) executed arithmetic rounding strategies.
  • Solution latencies and error rates were measured based on the difficulty of the preceding strategy.

Main Results:

  • Solution latencies were shorter after easier strategies (rounding down) than harder strategies (rounding up).
  • Strategy sequential difficulty effects were significantly larger in Alzheimer's disease (AD) patients.

Conclusions:

  • Comparable SSD effects were observed in young and healthy older adults.
  • Dramatically increased SSD effects in AD patients suggest implications for understanding cognitive decline in this population.