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

Closed-loop auditory stimulation during sleep increases cerebrospinal fluid flow waves by aligning with neural slow-wave peaks in humans.

• Why it matters: Understanding how neural activity influences CSF flow is crucial for insights into brain health and potential treatments for neurological conditions, but causal links remain unclear.
• What they did: The researchers developed a real-time, neural network-based closed-loop auditory stimulation method combined with MRI to enhance EEG slow waves in healthy adults, then measured CSF flow responses.
• The result: Stimulating during slow-wave peaks significantly boosted CSF flow and widespread brain hemodynamics, offering a new approach to modulate and study CSF dynamics with potential clinical applications.