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Structure-function correlates of cognitive decline in aging.

Jonas Persson1, Lars Nyberg, Johanna Lind

  • 1Department of Psychology, Umeå University, S-901 87 Umeå, Sweden. perssonj@umich.edu

Cerebral Cortex (New York, N.Y. : 1991)
|September 16, 2005
PubMed
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Cognitive decline in aging is linked to brain structure and function changes. Reduced hippocampal volume and altered white matter integrity correlate with memory loss, suggesting structural disruption or compensation.

Area of Science:

  • Neuroscience
  • Cognitive Aging Research
  • Neuroimaging

Background:

  • Cognitive decline is a significant concern in aging populations.
  • Understanding the neural underpinnings of memory decline is crucial for developing interventions.

Purpose of the Study:

  • To investigate the neural correlates of cognitive decline in aging.
  • To identify structural and functional brain differences between older adults with stable versus declining episodic memory.

Main Methods:

  • Longitudinal behavioral data from older adults (n=40) over a decade.
  • Structural and diffusion tensor imaging (DTI) to assess brain structure.
  • Functional magnetic resonance imaging (fMRI) during episodic memory encoding.

Main Results:

Related Experiment Videos

  • Declining memory performance correlated with reduced hippocampal volume and anterior corpus callosum fractional anisotropy.
  • Increased prefrontal cortex activation was observed during memory encoding, with greater right prefrontal activation in those with significant memory decline.
  • Anterior corpus callosum integrity negatively correlated with right prefrontal activation.

Conclusions:

  • Cognitive decline in aging is associated with both structural and functional brain alterations.
  • Observed functional changes may represent a compensatory mechanism for structural brain disruption.