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Temporal preparation in aging: a functional MRI study.

Antonino Vallesi1, Anthony R McIntosh, Donald T Stuss

  • 1Rotman Research Institute at Baycrest, 3560 Bathurst St., Toronto, ON, Canada. vallesi@sissa.it

Neuropsychologia
|June 24, 2009
PubMed
Summary
This summary is machine-generated.

Elderly adults show slower reaction times and impaired preparation compared to young adults, particularly under uncertain timing. This age-related deficit is linked to reduced activation in the right lateral prefrontal cortex.

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Area of Science:

  • Cognitive Neuroscience
  • Neuroimaging
  • Human Aging

Background:

  • Age-related cognitive decline affects reaction time and preparation.
  • Understanding the neural mechanisms of age-related differences in cognitive tasks is crucial.

Purpose of the Study:

  • To investigate age-related differences in reaction time (RT) and brain activation during a choice RT task with variable and fixed foreperiods.
  • To identify the neural correlates of age-related deficits in temporal preparation.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to scan young and elderly adults performing a choice RT task.
  • Task conditions included variable foreperiods (1-3s) and fixed foreperiods (1s or 3s).
  • Behavioral data (RT) and brain activation patterns were analyzed.

Main Results:

  • Elderly subjects exhibited slower RTs than young adults across all conditions.
  • An interaction between age and foreperiod was found in the variable condition: young adults improved with longer foreperiods, while elderly participants showed a reversed pattern.
  • Younger adults showed greater activation in right lateral prefrontal regions during the variable versus fixed foreperiod contrast compared to elderly participants.

Conclusions:

  • Age-related deficits in temporal preparation exist and are associated with impaired performance in variable foreperiod tasks.
  • The right lateral prefrontal cortex plays a critical role in strategic preparation under uncertain timing, and its reduced activation in the elderly may underlie preparation deficits.