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Abbiategrasso Brain Bank Protocol for Collecting, Processing and Characterizing Aging Brains
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Local brain atrophy accounts for functional activity differences in normal aging.

Grégoria Kalpouzos1, Jonas Persson, Lars Nyberg

  • 1Department of Integrative Medical Biology (Physiology), Umeå University, Umeå, Sweden. gregoria.kalpouzos@ki.se

Neurobiology of Aging
|April 29, 2011
PubMed
Summary
This summary is machine-generated.

Brain aging involves changes in gray matter volume (GMv) and functional brain activity. Local gray matter loss partly explains age-related under- and overactivation during memory tasks.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • Normal aging is associated with functional brain changes, including under- and overactivation during episodic memory tasks.
  • Older adults experience non-uniform gray matter volume (GMv) loss, potentially influencing brain activity patterns.

Purpose of the Study:

  • To investigate whether age-related differences in functional brain activity (under- and overrecruitment) are explained by local gray matter volume changes.
  • To link structural differences (atrophy) to functional alterations in aging brains during memory tasks.

Main Methods:

  • Voxel-based analyses combining blood oxygen level-dependent (BOLD) signals with gray matter volume (GMv) data.
  • Voxel-based morphometry (VBM) comparison between age groups to assess regional atrophy.

Main Results:

  • Occipital GMv loss correlated with reduced activation during memory encoding.
  • Local GMv loss accounted for overactivation in specific prefrontal and parietal regions during retrieval.
  • Despite overactivation, atrophy in these regions was modest compared to other brain areas.

Conclusions:

  • Structural changes, specifically gray matter atrophy, contribute to age-related functional alterations in the brain.
  • These findings connect age-related structural differences to both under- and overrecruitment in functional brain activity during memory tasks.