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Rapid hippocampal plasticity supports motor sequence learning.

Florencia Jacobacci1, Jorge L Armony2, Abraham Yeffal1

  • 1Instituto de Fisiología y Biofísica (IFIBIO) Houssay, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Departamento de Fisiología y Biofísica, Universidad de Buenos Aires, Buenos Aires, 1121, Argentina.

Proceedings of the National Academy of Sciences of the United States of America
|September 9, 2020
PubMed
Summary
This summary is machine-generated.

During quiet rest, the hippocampus and precuneus show increased activity, predicting motor learning gains. This suggests the hippocampal system is crucial for reactivating procedural memories during rest periods.

Keywords:
functional MRIhippocampusmotor sequence learningreactivationstructural plasticity

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Motor Learning

Background:

  • Motor skill acquisition involves performance improvements during practice breaks, termed micro-offline gains (MOGs).
  • Memory replay in the hippocampus is known in spatial learning, but its role in motor learning is unclear.

Purpose of the Study:

  • To investigate the hippocampus's involvement in the neural mechanisms underlying micro-offline gains in motor learning.
  • To explore the relationship between brain activity during rest and subsequent performance improvements.

Main Methods:

  • Utilized a multimodal approach combining functional and structural neuroimaging in human participants.
  • Measured brain activity and microstructural changes during interleaved practice and rest periods in a motor learning task.

Main Results:

  • Hippocampal and precuneus activity increased significantly during quiet rest periods between practice sessions.
  • This increased activity during rest predicted the magnitude of micro-offline gains in motor performance.
  • Rapid, minutes-scale alterations in brain microstructure were observed in the same networks, indicating swift structural plasticity.

Conclusions:

  • The hippocampal system plays a role in the reactivation of procedural memories during quiet rest.
  • Functional and structural brain changes during rest periods contribute to motor learning.
  • This study highlights the importance of offline periods for consolidating motor skills via hippocampal mechanisms.