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Midbrain-Hippocampus Structural Connectivity Selectively Predicts Motivated Memory Encoding.

Blake L Elliott1, Kimberlee D'Ardenne2, Vishnu P Murty3

  • 1Department of Psychology and Neuroscience, Temple University, Philadelphia, Pennsylvania 19122 Blake.Elliott@temple.edu.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|November 4, 2022
PubMed
Summary
This summary is machine-generated.

Individual differences in the structural connections of the hippocampus-VTA loop, crucial for motivated memory, are linked to memory performance. This highlights the brain

Keywords:
DTIdopamineepisodic memoryreward motivationsource memoryvalue-directed remembering

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • Functional MRI studies identify interactions between the dopaminergic midbrain (SN/VTA), hippocampus, and nucleus accumbens (NAc) as critical for motivated memory encoding.
  • It remains unclear whether these effects are transient or if individual structural differences in these circuits underlie motivated memory encoding.
  • Competing theories propose SN/VTA-NAc reward prediction errors or SN/VTA-hippocampus signals as drivers of motivated memory.

Purpose of the Study:

  • To quantify individual differences in the structure of the SN/VTA-striatum and SN/VTA-hippocampus pathways using diffusion-weighted MRI and probabilistic tractography.
  • To investigate the association between structural connectivity of these pathways and motivated memory encoding in humans.

Main Methods:

  • Participants completed a motivated source memory paradigm with reward, control, and punishment conditions during encoding and retrieval.
  • Diffusion-weighted MRI and probabilistic tractography were employed to measure tract density of SN/VTA-striatum and SN/VTA-hippocampus pathways.
  • Correlational analyses examined the relationship between pathway structural connectivity and memory performance.

Main Results:

  • Source memory was enhanced for both reward and punishment conditions compared to control, but item memory did not differ based on value.
  • Probabilistic tractography revealed a heterogeneous arrangement of the SN/VTA.
  • Tract density of SN/VTA-hippocampus pathways positively correlated with individual differences in motivated memory performance, while SN/VTA-striatum pathways showed no association.

Conclusions:

  • Pathways originating from the human SN/VTA are anatomically separable and functionally heterogeneous.
  • Individual differences in the structural connectivity of the dopaminergic hippocampus-VTA loop are selectively associated with motivated memory encoding.
  • This suggests that the structural integrity of the hippocampus-VTA pathway plays a specific role in motivated memory.