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Related Experiment Video

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An FMRI-compatible Symbol Search task.

Spencer W Liebel1, Uraina S Clark2, Xiaomeng Xu3

  • 11University of Georgia,Department of Psychology,Athens,Georgia.

Journal of the International Neuropsychological Society : JINS
|March 21, 2015
PubMed
Summary

This study confirms that the functional magnetic resonance imaging (fMRI) Symbol Search task is a reliable and valid tool for measuring cognitive processing speed (CPS) in older adults, showing good test-retest reliability and correlation with established measures.

Keywords:
Reliability

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Medical Imaging

Background:

  • Cognitive processing speed (CPS) declines with age, impacting older adults.
  • Measuring CPS in aging populations is crucial for research and clinical settings.
  • Functional magnetic resonance imaging (fMRI) offers potential for in-scanner cognitive assessments.

Purpose of the Study:

  • To evaluate the reliability and validity of a novel fMRI Symbol Search task.
  • To assess the task's performance in healthy older adults.
  • To determine if the fMRI task can reliably measure cognitive processing speed.

Main Methods:

  • Developed and administered a new fMRI Symbol Search task.
  • Compared fMRI task performance to out-of-scanner performance and the Wechsler Adult Intelligence Scale (WAIS) Symbol Search subtest.
  • Utilized neuropsychological measures to assess convergent and discriminant validity.

Main Results:

  • The fMRI Symbol Search task demonstrated high test-retest reliability (r=.791, p<.001).
  • Strong positive correlation observed between the fMRI task and the WAIS Symbol Search (r=.717, p<.001).
  • The task showed expected patterns for convergent and discriminant validity, sensitive to age-related cognitive changes.

Conclusions:

  • The fMRI Symbol Search task is a reliable and valid measure of CPS in healthy older adults.
  • This tool is suitable for use in clinical and research settings involving MR scanners.
  • The task effectively captures age-related declines in cognitive processing speed.