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Combining Behavior and EEG to Study the Effects of Mindfulness Meditation on Episodic Memory
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Executive function mediates effects of white matter hyperintensities on episodic memory.

Colleen M Parks1, Ana-Maria Iosif, Sarah Farias

  • 1Psychology Department, University of Nevada, Las Vegas, NV 89154, United States. colleen.parks@unlv.edu

Neuropsychologia
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Summary

White matter hyperintensities (WMH) impact episodic memory in older adults, with executive functioning acting as a key mediator. This relationship is further influenced by the interaction between executive functioning and hippocampal volume.

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Area of Science:

  • Neuroscience
  • Gerontology
  • Cognitive Psychology

Background:

  • White matter hyperintensities (WMH) are common in aging and associated with cognitive decline.
  • Executive functioning and hippocampal volume are critical for episodic memory.

Purpose of the Study:

  • To investigate the relationship between WMH, executive functioning, and episodic memory in older adults.
  • To explore the mediating role of executive functioning and the moderating role of hippocampal volume.

Main Methods:

  • Volumetric magnetic resonance imaging (MRI) was used to assess brain structures.
  • Participants included cognitively normal older adults, and those with MCI or dementia.
  • Regression analyses evaluated predictors of episodic memory.

Main Results:

  • WMH independently affected episodic memory and executive functioning.
  • Executive functioning mediated the effect of WMH on episodic memory.
  • The influence of WMH on episodic memory was eliminated when the interaction between executive functioning and hippocampal volume was considered.

Conclusions:

  • Executive functioning plays a crucial mediating role in how WMH affect episodic memory.
  • Executive functioning and hippocampal volume interact, influencing episodic memory in older adults.