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Related Experiment Video

Updated: Jun 23, 2025

Recording Gamma Band Oscillations in Pedunculopontine Nucleus Neurons

Recording Gamma Band Oscillations in Pedunculopontine Nucleus Neurons

Published on: September 14, 2016

Hyperpolarization-activated currents drive neuronal activation sequences in sleep.

Dhruv Mehrotra¹, Daniel Levenstein², Adrian J Duszkiewicz³

¹Montréal Neurological Institute and Hospital, Department of Neurology and Neurosurgery, 3801 Rue University, Montréal, QC H3A 2B4, Canada; Integrated Program in Neuroscience, McGill University, 3801 Rue University, Montréal, QC H3A 2B4, Canada.

Current Biology : CB

|June 20, 2024

Summary

This summary is machine-generated.

Researchers discovered that sequential neuronal activity during sleep, crucial for brain function, originates from a gradient of hyperpolarization-activated currents (Ih) across the mouse postsubiculum. This finding sheds light on how the brain organizes information for learning and memory.

Keywords:

electrophysiology head direction hyperpolarization-activated current neuronal dynamics oscillations sleep

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Last Updated: Jun 23, 2025

Recording Gamma Band Oscillations in Pedunculopontine Nucleus Neurons

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Published on: September 14, 2016

Induction of an Isoelectric Brain State to Investigate the Impact of Endogenous Synaptic Activity on Neuronal Excitability In Vivo

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Optogenetic Manipulation of Neural Circuits During Monitoring Sleep/wakefulness States in Mice

Optogenetic Manipulation of Neural Circuits During Monitoring Sleep/wakefulness States in Mice

Published on: June 19, 2019

Area of Science:

Neuroscience
Computational Neuroscience
Systems Neuroscience

Background:

Sequential neuronal patterns are critical for cortical information processing but their origins remain unclear.
The mouse postsubiculum (PoSub) contains neurons modulated by head direction, suggesting a role in spatial representation.
Understanding the generation of sequential activity during sleep is vital for comprehending memory consolidation.

Purpose of the Study:

To investigate the origin of sequential neuronal activation patterns during sleep in the mouse postsubiculum.
To explore the role of hyperpolarization-activated currents (Ih) in generating these sequential dynamics.
To determine if these findings have broader implications for cortical information processing and memory.

Main Methods:

Recording neuronal activity in the mouse postsubiculum during sleep.
Utilizing computational modeling to simulate neuronal dynamics and test hypotheses.
Performing ex vivo slice experiments to validate the role of Ih currents.
Corroborating findings in other cortical structures.

Main Results:

Neuronal activity in the postsubiculum showed sequential activation along the dorsoventral axis during transitions between DOWN and UP states.
This sequential activity represented a stable head direction.
Computational modeling indicated a spatial gradient of Ih currents could explain these dynamics.
Experimental validation confirmed the presence and role of Ih currents in the postsubiculum.

Conclusions:

A spatial gradient of Ih currents across cortical neurons can generate sequential neuronal patterns.
Traveling activity upstream of the entorhinal-hippocampal circuit may organize large-scale neuronal activity.
These findings provide a novel mechanism for how the brain supports learning and memory during sleep.