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COMT polymorphism and memory dedifferentiation in old age.

Goran Papenberg1, Lars Bäckman2, Irene E Nagel3

  • 1Center for Lifespan Psychology, Max Planck Institute for Human Development.

Psychology and Aging
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Summary
This summary is machine-generated.

Genetic variations in COMT Val158Met influence how memory functions are linked in aging. Older adults with low dopamine availability showed decreased memory differentiation, supporting theories of cognitive aging.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Genetics

Background:

  • Cognitive aging theories suggest reduced dopaminergic modulation leads to less differentiated neural processing.
  • Individual genetic differences in dopamine signaling may impact memory function associations, especially in older adults.

Purpose of the Study:

  • To investigate how COMT Val158Met genotypes, affecting prefrontal dopamine, influence the relationship between verbal episodic and spatial working memory.
  • To test if genetic predispositions in dopamine signaling contribute to memory dedifferentiation in aging.

Main Methods:

  • Compared latent correlations between episodic and working memory factors across three COMT Val158Met genotypes (Val/Val, Val/Met, Met/Met) in younger and older adults.
  • Analyzed memory performance differences within the low-performing tertile of older adults based on COMT genotype.

Main Results:

  • In older adults, memory functions were more highly correlated in Val homozygotes (low prefrontal dopamine) than in heterozygotes and Met homozygotes.
  • No significant differences in memory factor means were found by COMT status within age groups.
  • Among older adults in the lowest performance tertile, Val homozygotes exhibited poorer episodic and working memory than other genotypes.

Conclusions:

  • The findings support the neurocomputational theory of cognitive aging, suggesting suboptimal dopaminergic modulation contributes to memory decline and dedifferentiation in aging.
  • Genetic variations in dopamine pathways, like COMT Val158Met, are linked to age-related changes in memory function associations.