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Related Experiment Video

Updated: Jul 1, 2026

Automatic Detection of Highly Organized Theta Oscillations in the Murine EEG
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Theta-phase locking of single neurons during human spatial memory.

Tim A Guth1,2, Armin Brandt2, Peter C Reinacher3,4

  • 1Department of Epileptology, University Hospital Bonn, Bonn, Germany.

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|July 1, 2024
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Summary

Single neurons synchronize with brain waves (theta oscillations) during spatial memory tasks in humans. This synchronization is influenced by brain signal properties and is crucial for memory encoding and retrieval.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Electrophysiology

Background:

  • Single-neuron timing relative to local field potentials (LFPs) is vital for cognitive functions.
  • Theta oscillations are implicated in human memory, but factors influencing neuronal phase-locking remain unclear.

Purpose of the Study:

  • To investigate factors modulating theta-phase locking of single neurons in the human brain.
  • To enhance understanding of neuronal interactions with LFPs during spatial memory.

Main Methods:

  • Utilized single-neuron recordings in epilepsy patients during a spatial memory task.
  • Employed a generalized-phase approach for theta-phase estimation and time-resolved spectral parameterization.

Main Results:

  • Theta-phase locking is prevalent in the human medial temporal lobe during memory encoding and retrieval.
  • Phase-locking strengthened with increased theta power, clear oscillations, and steeper aperiodic activity slopes.
  • Neuronal activation phases were consistent between successful and unsuccessful memory, with some shifts indicating distinct memory processes.

Conclusions:

  • Theta-phase locking is a robust phenomenon influenced by LFP properties and memory states in humans.
  • Findings clarify how neuronal interactions with LFPs support human spatial memory.
  • Different memory processes may be segregated within the theta cycle.