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Related Experiment Video

Updated: Sep 19, 2025

Tuning in the Hippocampal Theta Band In Vitro: Methodologies for Recording from the Isolated Rodent Septohippocampal Circuit
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Sustained Hippocampal Theta Oscillations Reflect Experience-Dependent Learning in Backward Temporal Order Memory

Hongjie Jiang1,2, Jing Cai3, Diogo Santos-Pata3

  • 1Department of Neurosurgery, School of Medicine, The Second Affiliated Hospital of Zhejiang University, Hangzhou 310009, China.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|May 30, 2025
PubMed
Summary

Hippocampal theta oscillations are crucial for recalling temporal order memories. Higher theta activity supports backward memory retrieval, while gamma activity is more involved in forward retrieval, revealing directional memory mechanisms.

Keywords:
episodic memoryhippocampusiEEGlearningtemporal order judgmenttheta oscillation

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Memory Research

Background:

  • Sequential learning and navigation rely on remembering item relationships.
  • Hippocampal theta activity is implicated in encoding and recalling relational structures.
  • The specific role of theta oscillations in retrieving temporal order in opposing directions remains unclear.

Purpose of the Study:

  • To investigate the role of hippocampal theta oscillations in retrieving temporal order memories in both forward and backward directions.
  • To characterize how theta oscillations differ between forward and backward memory retrieval conditions.
  • To explore the relationship between oscillatory activity and behavioral performance in temporal order memory tasks.

Main Methods:

  • Intracranial recordings from hippocampal electrodes in 10 human epileptic patients.
  • A temporal order memory task involving learning spatial relationships on a circular track.
  • Testing both forward-cued and backward-cued retrieval conditions.
  • Analysis of theta (2-8 Hz) and gamma (30-70 Hz) band oscillatory activity, including P_episode rate and cross-frequency coupling.

Main Results:

  • Sustained high-power theta P_episode rate was significantly higher for backward retrieval conditions in the later stage of memory retrieval.
  • Theta P_episode rate correlated with behavioral memory performance.
  • Low gamma P_episode rate showed a stronger effect for forward than backward retrieval.
  • Control analyses confirmed the specificity of theta rhythmic activity to episodic learning.

Conclusions:

  • Theta oscillations play a specific role in the learning process for efficient retrieval of temporal order memories, particularly for backward recall.
  • Gamma oscillations appear more involved in forward retrieval processes.
  • These findings elucidate the distinct neural mechanisms underlying directional memory retrieval in the human hippocampus.