Respiration organizes gamma synchrony in the prefronto-thalamic network.

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Systems Neuroscience

Background:

• Gamma oscillations in the medial prefrontal cortex (mPFC) are linked to cognitive operations.
• The precise mechanisms controlling mPFC gamma rhythm remain largely unknown.

Purpose of the Study:

• To investigate the mechanisms underlying gamma oscillations in the mPFC.
• To explore the role of respiration in organizing neural activity within the prefrontal cortex.

Main Methods:

• Local field potential recordings in awake cats.
• In vivo intracellular recordings in mouse thalamus.
• Analysis of gamma band oscillations and their relationship with the respiratory cycle.

Main Results:

• Periodic gamma bursts in the mPFC exhibit 1 Hz regularity and are phase-locked to the exhalation phase of respiration.
• Respiration synchronizes gamma band activity between the mPFC and the nucleus reuniens (Reu) of the thalamus.
• Synaptic activity in the Reu propagates respiration timing, potentially driving mPFC gamma bursts.

Conclusions:

• Breathing serves as a critical substrate for long-range neuronal synchronization in the prefrontal cortex.
• Respiratory-driven synchronization facilitates communication between the mPFC and hippocampus.
• This mechanism provides new insights into how basic physiological processes influence complex cognitive functions.