Sleep Stimulation Device Synchronizing Stimuli with Brain Rhythms
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Solution Overview
Problem
Current methods for enhancing memory consolidation during sleep, such as stimulating brain rhythms, often disregard the phase of ongoing endogenous activity, leading to limited enhancement of slow-wave sleep oscillations (SOS) and minimal changes in sleep architecture.
Innovation Solution
A non-invasive method involving monitoring of sleep cycles to detect the end of stage I non-REM light sleep, applying a first stimulus at the onset of stage II, and a second stimulus until the end of stage IV, with the method restarting at stage II onset, to extend slow-wave sleep stages and modulate sleep architecture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stimuli are applied during sleep to enhance memory consolidation, then memory consolidation is improved, but the enhancement of slow-wave sleep oscillations is limited when stimuli are not synchronized with brain rhythms
Solution Approach 1:
The patent applies periodic stimuli synchronized with the brain's endogenous slow oscillation rhythms during sleep. The stimulation protocol delivers auditory or tactile stimuli at specific phases of the slow-wave oscillations (approximately 0.5-4 Hz), creating a rhythmic pattern that resonates with and amplifies the brain's natural oscillatory activity, thereby enhancing slow-wave sleep oscillations and improving memory consolidation.
Solution Approach 2:
The patent modifies the timing parameter of stimulus delivery by synchronizing it with the phase of ongoing brain oscillations. Instead of delivering stimuli at fixed intervals or random times, the system adjusts the stimulus timing to match the dynamic phase of slow-wave sleep oscillations, optimizing the enhancement effect on both oscillation amplitude and memory consolidation.
2Ease of operation
If conventional stimulation methods are used without phase synchronization, then the stimulation protocol is simple to implement, but the modification of sleep architecture is minimal
Solution Approach 1:
The patent employs a feedback mechanism where brain activity is continuously monitored via EEG to detect the phase of slow oscillations. This real-time feedback information is used to dynamically adjust the timing of stimulus delivery, ensuring synchronization with the brain's ongoing rhythms. The system closes the loop by using measured brain state to control stimulus timing, thereby effectively modifying sleep architecture while maintaining operational feasibility.
Solution Approach 2:
The stimulation protocol transitions from a static, fixed-interval approach to a dynamic, adaptive approach where stimulus timing continuously adjusts to match the variable phase of brain oscillations. This dynamic synchronization allows the system to respond to the brain's changing state throughout sleep, maximizing architectural modification while remaining practical to implement.
3Device complexity
If stimuli are delivered at fixed intervals, then the device complexity is reduced, but the synchronization with brain's natural rhythms is lost
Solution Approach 1:
The system uses real-time EEG feedback to detect brain oscillation phase and dynamically adjusts stimulus timing accordingly. This feedback loop enables precise synchronization with brain rhythms without requiring overly complex device architecture, as the complexity is managed through software-based phase detection and timing adjustment rather than hardware complexity.
Solution Approach 2:
The patent employs a multi-functional system that combines EEG recording, phase detection, and stimulus delivery in a single integrated device. This universal approach allows the same device to perform multiple functions (monitoring and stimulating) without requiring separate specialized equipment, thereby achieving rhythm synchronization without proportionally increasing device complexity.
Data Source
AI summary
The present invention relates to methods and devices to consolidate memory and/or cognitive functions by monitoring brain rhythms and delivering a stimulus at an appropriate stage of sleep cycle.