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Network dynamics have been proposed as a mechanistic substrate for the information transfer across cortical and hippocampal circuits. However, little is known about the mechanisms that synchronize and coordinate these processes across widespread brain regions during offline states. Here we address the hypothesis that breathing acts as an oscillatory pacemaker, persistently coupling distributed brain circuit dynamics. Using large-scale recordings from a number of cortical and subcortical brain regions in behaving mice, we uncover the presence of an intracerebral respiratory corollary discharge, that modulates neural activity across these circuits. During offline states, the respiratory modulation underlies the coupling of hippocampal sharp-wave ripples and cortical DOWN/UP state transitions, which mediates systems memory consolidation. These results highlight breathing, a perennial brain rhythm, as an oscillatory scaffold for the functional coordination of the limbic circuit that supports the segregation and integration of information flow across neuronal networks during offline states.
During offline states, the respiratory modulation underlies the coupling of hippocampal sharp-wave ripples and cortical DOWN/UP state transitions, which mediates systems memory consolidation.
neural coordination is measured, but a memory-consolidation outcome is not directly tested
The respiratory rhythm, via a centrifugal corollary discharge, acts as a functional oscillatory scaffold and provides a unifying global temporal coordination of neuronal firing and network dynamics.
multiregion modulation persists after deafferentation, although the ascending pathway itself remains unidentified
Opto-ripple-based experiments demonstrate that it is the breathing cycle and not other covariates of endogenous ripples that modulates cortical excitability.
randomly timed opto-ripples isolate breathing-phase-dependent excitability, with limited animal-level precision
Derived from the full evaluation — not a separate score.
Strengths
The study combines LFP and single-unit recordings, laminar CSD, olfactory deafferentation, and optogenetically generated ripple-like events. These methods test the proposed coordination mechanism from complementary physiological angles.
↳ Results, Figs. 2–9; Methods
Respiration-linked activity is characterized across mPFC, hippocampus, BLA, NAc, visual cortex, and thalamus, extending the contribution beyond a local LFP correlation.
↳ Results, Fig. 3; Discussion, Fig. 10
The Discussion distinguishes ROR from the proposed RCD, acknowledges locally generated slow oscillations, and identifies bidirectional coupling and an unknown anatomical pathway as unresolved.
↳ Discussion, “Respiratory corollary discharge couples global brain circuits” and “Breathing rhythm mediates synchronization…”
Limitations
The Abstract says the coupling mediates systems memory consolidation, but the experiments measure neural coordination and excitability rather than a causal consolidation outcome.
↳ Abstract; Discussion, “Breathing rhythm mediates synchronization…”
Persistence after olfactory deafferentation supports a non-olfactory respiratory influence, but it does not directly distinguish a brainstem efference copy from other ascending inputs.
↳ Results, Fig. 5h–j; Discussion, “Respiratory corollary discharge couples global brain circuits”
The experiments span several regions and preparations but use only male C57BL6/J mice, leaving cross-sex, cross-species, and human transfer untested.
↳ Methods, Animals
The contribution is driven by the integration of multiregion recordings, laminar CSD, olfactory deafferentation, and optogenetically generated ripple-like events. Methods for phase analysis and Granger causality include explicit controls for nonuniform phase distributions and signal-to-noise asymmetry. The principal interpretive constraint is that persistent modulation after deafferentation does not directly identify the proposed ascending RCD pathway. The Abstract also extends the circuit-level results to systems memory consolidation without measuring that functional outcome.
Nabu’s assessment, alongside the field’s view.
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Strong3.9
Confidence mediumThe study meaningfully extends prior respiratory-entrainment work by connecting multiregion activity, olfactory deafferentation, and optogenetically induced ripples within one account of offline coordination. The advance remains incomplete because the proposed RCD pathway is not anatomically identified.
“Although the pathways mediating RCD remain unknown”
Recordings, laminar CSD, deafferentation, circular-statistics correction, time-reversed Granger analysis, and optogenetic stimulation provide convergent tests of the central physiology. Precision is limited by the indirect source attribution and the N=3 cohort reported for opto-ripple frequency characterization.
“To correct for the effect of SNR differences on Granger causality estimates”
The Results progress coherently from local entrainment to multiregion modulation and causal manipulations. The Abstract nevertheless states that the coupling “mediates systems memory consolidation,” although the study does not measure a consolidation outcome.
“which mediates systems memory consolidation”
The Discussion engages prior work on ripples, slow oscillations, respiratory entrainment, and locally generated cortical dynamics, while identifying the unknown RCD pathway and need for closed-loop perturbation. Its body text appropriately qualifies necessity even though the abstract framing is stronger.
“This does not imply the necessity of respiratory modulation for reactivation per se”
Caveats4 of 4 checks
Reported results are internally coherent, but residual respiration-linked activity is attributed to RCD without direct identification or experimental separation of its proposed ascending pathway.
Animal ethics approval and source-data availability are declared, with no reported conduct inconsistency in the supplied text. Lack of an identified code repository or independently inspected supplements is an assessability gap rather than a reliability concern.
Flags: 2 declared / 5 total
144 of 146 checkable references verified
147 references in manuscript 1 are books, websites or datasets — counted, but not index-checkable
No retraction notice found in Retraction Watch.
Sources: Retraction Watch ✓
Where this paper’s evidence sits on the path from initial observation to real-world use.
The work characterizes a mechanism under controlled mouse electrophysiology, pharmacology, and optogenetics, but does not test a human intervention or implementation pathway. Readiness therefore remains at an early basic-research stage.
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