Closed-loop auditory stimulation in phase with slow waves during sleep enhances cerebrospinal fluid flow in humans.

Precisely timed sounds increased sleep slow waves and associated cerebrospinal-fluid flow waves in healthy adults. The experiment measured physiology, not better sleep, cognition or disease outcomes.

Levitt J, Zeng X, Yang Z, Jacob LPL, Lewis LD.
Science translational medicine · Publication date: 2026-09-09
Added to site: 2026-09-10
DOI: 10.1126/scitranslmed.aea5469

First-publication date from the authoritative indexed record.

Modalities

EEG, Closed-loop stimulation

Clinical focus

Sleep, Brain health

Population

Healthy adults sleeping during simultaneous EEG and MRI

Sample

Not reported in the reviewed abstract

Intervention / method

Phase-locked auditory stimulation targeted to EEG slow-wave peaks during non-REM sleep

Comparator

Auditory stimulation at other phases of the slow wave

Clinician summary

Peak-aligned stimulation increased cerebrospinal-fluid flow waves in simultaneous MRI; the effect was phase dependent and accompanied by widespread hemodynamic waves.

How to interpret the findings

Participant count and detailed controls were unavailable in the reviewed abstract. Healthy-volunteer physiology does not establish clinical benefit, durability or safety for patient treatment.

Equipment and disclosures

Simultaneous EEG, MRI, real-time denoising and neural-network phase targeting were described; commercial hardware was not verified from the abstract.

Funding and competing-interest disclosures were not verified from the reviewed abstract.

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