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Mnemonic discrimination relates to perforant path integrity: An ultra-high resolution diffusion tensor imaging study.

Ilana J Bennett1, Craig E L Stark1

  • 1Center for the Neurobiology of Learning and Memory and Department of Neurobiology and Behavior, University of California, Irvine, United States.

Neurobiology of Learning and Memory
|July 8, 2015
PubMed
Summary

This study shows that the integrity of the perforant path, crucial for memory, specifically relates to mnemonic discrimination. This suggests a broader medial temporal lobe network may support this memory function.

Keywords:
AgingDiffusion tensor imagingMnemonic discriminationPattern separationPerforant pathway

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neuroimaging

Background:

  • Pattern separation is a key memory process mediated by the hippocampus, crucial for distinguishing similar experiences.
  • Previous research linked perforant path integrity to mnemonic discrimination, a measure of pattern separation, in older adults.

Purpose of the Study:

  • To investigate the specificity of the relationship between perforant path integrity and mnemonic discrimination.
  • To examine this relationship in relation to other cognitive functions and white matter tracts in healthy adults across a wide age range.

Main Methods:

  • Ultra-high in-plane resolution diffusion tensor imaging (hrDTI) was used to assess white matter tract integrity.
  • 112 healthy adults (20-87 years) underwent hrDTI and cognitive assessments, including a measure of mnemonic discrimination.
  • Factor analysis was employed to identify distinct cognitive constructs and analyze relationships with white matter integrity.

Main Results:

  • Age-related declines in the integrity of the perforant path and other medial temporal lobe (MTL) tracts were observed.
  • Perforant path integrity specifically correlated with mnemonic discrimination performance, even after controlling for global brain aging effects.
  • Similar relationships were found for the hippocampal cingulum and fornix, suggesting a network effect.

Conclusions:

  • Perforant path integrity is specifically associated with mnemonic discrimination, supporting its role in pattern separation.
  • Mnemonic discrimination appears to be supported by a broader network within the medial temporal lobe, not solely the perforant path.