Phase-targeted auditory stimulation (PTAS) timed to endogenous slow oscillations significantly enhances slow-wave sleep power, suppresses interictal epileptiform discharges, and improves cognitive performance in children with epilepsy undergoing intracranial recordings.
Key Findings
Results
PTAS significantly enhanced slow-wave sleep (SWS) power with maximal effects observed in thalamic, frontal, and auditory regions.
Study included 27 children undergoing epilepsy monitoring with simultaneous scalp, intracranial, and thalamic recordings.
A randomized cross-over protocol was used to compare PTAS to control conditions.
The system delivered auditory stimuli timed to endogenous slow oscillations (phase-targeted).
Thalamic, frontal, and auditory regions showed the greatest enhancement in SWS power.
Results
PTAS suppressed interictal epileptiform discharges (IEDs) from 0.4 to less than 0.1 spikes per minute.
IED rate decreased from 0.4 spikes/min at baseline to less than 0.1 spikes/min during PTAS.
This represents a greater than 75% reduction in pathological epileptiform activity.
IEDs are associated with heightened seizure susceptibility and cognitive disruption in epilepsy.
The suppression of IEDs was recorded with simultaneous scalp and intracranial recordings.
Results
PTAS improved cognitive performance on a response inhibition task from 76% to 95% accuracy.
Accuracy on the response inhibition task increased from 76% to 95% following PTAS.
Response inhibition is a cognitive domain known to be impaired in children with epilepsy.
Cognitive testing was conducted in the context of the same cross-over protocol used for sleep measures.
This improvement was observed in children undergoing intracranial epilepsy monitoring.
Background
Children with epilepsy experience a vicious cycle in which disturbed sleep heightens seizure susceptibility while seizures further disrupt slow-wave sleep.
Slow-wave sleep (SWS) is described as critical for cognitive, immune, and metabolic function.
Epilepsy particularly impairs SWS, which is the sleep stage most affected by the disorder.
The bidirectional relationship between sleep disruption and seizures motivates the development of sleep-modulating interventions.
PTAS was designed as a physiologically informed, non-invasive approach to address this cycle.
Methods
The PTAS system delivers auditory stimuli timed to the phase of endogenous slow oscillations to modulate sleep architecture.
The system is described as a closed-loop modulation approach, responding to ongoing brain activity in real time.
Stimuli are phase-targeted, meaning they are delivered at specific phases of naturally occurring slow oscillations.
The study used simultaneous scalp, intracranial, and thalamic recordings to capture multi-level neurophysiological responses.
The approach is characterized as non-invasive from the stimulation standpoint, using auditory rather than electrical stimulation.
Results
Intracranial recordings provided direct evidence that closed-loop auditory stimulation modulates sleep architecture, suppresses pathological activity, and enhances cognition.
The simultaneous use of scalp, intracranial, and thalamic recordings is highlighted as providing direct intracranial evidence.
This multi-level recording approach allowed assessment of PTAS effects across cortical and subcortical structures.
The authors describe PTAS as addressing both neurophysiological and cognitive comorbidities in pediatric epilepsy.
The results are presented as supporting PTAS as a physiologically informed intervention.
What This Means
This research suggests that a non-invasive sound-based system can improve sleep quality, reduce abnormal brain activity, and boost thinking skills in children with epilepsy. The system, called phase-targeted auditory stimulation (PTAS), plays soft sounds at precisely timed moments during deep sleep—specifically during the natural slow rhythms the brain produces—to reinforce those rhythms. The study tested this in 27 children who were already in the hospital having their brain activity monitored with both scalp sensors and electrodes placed inside the brain, giving researchers an unusually detailed view of what was happening across multiple brain regions including the thalamus.
The findings showed that PTAS boosted deep sleep brain activity, especially in the thalamus, frontal regions, and areas involved in hearing. It also dramatically reduced 'interictal epileptiform discharges'—brief abnormal electrical bursts in the brain that occur between seizures and are linked to both seizure risk and thinking problems—dropping from 0.4 bursts per minute to fewer than 0.1. Children also performed better on a task measuring self-control and attention after the stimulation, with accuracy improving from 76% to 95%.
This matters because children with epilepsy often get trapped in a harmful cycle: poor sleep makes seizures more likely, and seizures in turn worsen sleep, which can harm memory, learning, immune function, and overall development. This research suggests that a carefully timed auditory intervention—requiring no surgery or implanted devices—could break that cycle by improving the quality of deep sleep itself, with downstream benefits for both brain health and cognitive performance in a vulnerable pediatric population.
Wong S, Li V, Mithani K, Warsi N, Suresh H, Coleman S, et al.. (2026). Closed-loop modulation of sleep in children undergoing intracranial recordings.. Cell reports. Medicine. https://doi.org/10.1016/j.xcrm.2025.102538