Sleep Stimulation Timing via EEG Feedback
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Solution Overview
Problem
Existing systems for sensory stimulation during sleep often fail to synchronize stimulation with natural sleep patterns, leading to ineffective induction of slow-wave activity, which is crucial for restorative sleep.
Innovation Solution
A system that delivers probing sensory stimulation to determine the timing of subsequent slow-wave stimulation based on individual brain activity, using a combination of sensors and processors to customize the stimulation timing to match naturally occurring slow waves, and ceases stimulation if arousal is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sensory stimulation is applied continuously or at fixed intervals, then the stimulation coverage is maximized, but the synchronization with natural sleep patterns is lost, reducing effectiveness
Solution Approach 1:
The system continuously monitors EEG signals to detect slow-wave activity and uses this feedback to dynamically adjust stimulation timing. The processor analyzes real-time brain activity patterns and triggers stimulation only when natural slow waves are detected, creating a closed-loop control system that adapts to the subject's unique sleep patterns.
Solution Approach 2:
The stimulation timing transitions from fixed intervals to dynamic, adaptive timing based on real-time EEG analysis. The system adjusts stimulation parameters continuously according to the subject's evolving sleep state, making the stimulation protocol flexible and responsive to individual variations in sleep architecture.
2Measurement precision
If probing stimulation is used to determine individual slow-wave timing, then the customization and precision are improved, but the system complexity and measurement requirements increase
Solution Approach 1:
The system uses the subject's own brain activity patterns as the reference for stimulation timing. By detecting naturally occurring slow waves through EEG monitoring, the system eliminates the need for external probing or calibration sessions, using the subject's inherent neural rhythms to guide the stimulation protocol.
Solution Approach 2:
The system focuses on detecting specific EEG parameter changes (slow-wave frequency bands, amplitude patterns) to trigger stimulation. By monitoring changes in these electrical parameters rather than requiring complex multi-parameter analysis, the system achieves high timing precision with manageable computational requirements.
3Productivity
If stimulation is delivered to maximize slow-wave activity, then the restorative sleep benefit is increased, but the risk of inducing arousal or disrupting sleep architecture increases
Solution Approach 1:
The system applies stimulation in partial bursts synchronized with natural slow-wave cycles rather than continuous delivery. By delivering stimulation only during specific phases of slow-wave activity and using intermittent pulsing, the system achieves cumulative restorative effects while allowing the sleep architecture to maintain its natural rhythm and prevent arousal.
Solution Approach 2:
The system monitors EEG patterns to detect early signs of arousal or sleep stage transitions before they occur. By identifying precursor patterns in brain activity, the system can pause or adjust stimulation timing to prevent disruptive events, cushioning against potential sleep architecture disruption.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively increases sleep slow waves, enhancing the quality of sleep by synchronizing stimulation with natural sleep patterns, leading to improved restfulness and potentially increasing power in the slow-wave activity bandwidth.
Implementation Method 1
A sensor generates output signals conveying information related to electrical brain activity of the subject
Data Source
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AI summary
The present disclosure pertains to a system (10) configured to determine timing of sensory stimulation provided to a subject (12) to increase sleep slow waves during a sleep session. The system generates (602) output signals conveying information related to a sleep stage of the subject during the sleep session with one or more sensors (18, 204, 205, 206); detects (604) slow wave sleep in the subject based on the output signals; controls (606) one or more sensory stimulators (16, 208, 210) to provide first sensory stimulation (300, 302) to the subject to induce sleep slow waves; determines (610) a representative slow wave (350, 400); and determines (612) timing (500) of second stimulation (502) provided to the subject, the second stimulation configured to increase sleep slow waves in the subject during the sleep session, the timing determination based on the representative slow wave.