Closed-loop DBS for Memory Consolidation
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Solution Overview
Problem
There is a gap between non-invasive cognitive research on human declarative memory and mechanistic animal research on hippocampal activity, particularly in understanding the role of sleep in memory consolidation, with limited direct evidence on the interplay between medial-temporal-lobe and neocortical activities during sleep.
Innovation Solution
Implementing real-time closed-loop intracranial electrical stimulation in the prefrontal cortex synchronized with medial-temporal-lobe active periods to enhance the temporal coordination between sleep activities, thereby improving memory consolidation by increasing neocortical slow waves, sleep spindles, and hippocampo-cortical synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If real-time closed-loop intracranial electrical stimulation is implemented in the prefrontal cortex synchronized with medial-temporal-lobe active periods, then memory consolidation is enhanced and hippocampo-cortical synchronization is improved, but device complexity and invasiveness increase
Solution Approach 1:
The system employs closed-loop control where neural activity from the medial temporal lobe is recorded and used to trigger synchronized stimulation in the prefrontal cortex. The stimulation timing is dynamically adjusted based on detected neural oscillations, creating a feedback mechanism that enhances memory consolidation through precise temporal coordination between brain regions.
Solution Approach 2:
The patent uses implanted electrodes as intermediaries to deliver controlled electrical stimulation to specific brain regions. These electrodes serve as the interface between the external control system and the neural tissue, enabling precise modulation of hippocampo-cortical synchronization without direct external manipulation of the brain.
2Measurement precision
If intracranial electrodes are implanted for real-time closed-loop stimulation, then measurement precision of neural activity is improved, but invasiveness and surgical risk increase
Solution Approach 1:
The implanted electrodes serve multiple functions: they record neural activity from the medial temporal lobe, provide electrical stimulation to the prefrontal cortex, and enable real-time closed-loop control. This multi-functionality reduces the need for separate devices and minimizes the overall invasiveness while achieving high measurement precision.
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
This approach provides causal evidence for the role of hippocampo-cortical synchronization in memory consolidation, enhancing memory performance and suggesting potential treatments for memory disorders by dynamically manipulating sleep electrophysiology.
Implementation Method 1
recording signals from a first region of a brain of a human subject during sleep via a first electrode
Implementation Method 2
stimulating a second region of the brain during the active periods via a second electrode that is electrically coupled to the first electrode via closed-loop control
Data Source
AI summary
A closed-loop neuromodulatory system comprises one or more processors and memory. The system is configured to record signals from a first region of a brain of a human subject during sleep via a first electrode. The system is configured to determine, from the recorded signals, active periods of the first region. The system is configured to stimulate a second region of the brain, different from the first region, during the active periods via a second electrode that is electrically coupled to the first electrode via closed-loop control.