Wearable EEG Interface With Synchronized Stimulus Timing
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Solution Overview
Problem
Existing wearable EEG systems for cognitive testing face limitations such as lack of time synchronization between stimulus presentation and EEG recording, requiring external equipment, and are not suitable for mobile use, leading to timing uncertainties and unreliable latency measures in ERP data.
Innovation Solution
A wearable head-mounted device with integrated EEG and PPG sensors, headphones, and a cognitive test interface unit that synchronizes visual and auditory stimuli with EEG data using a smartphone or tablet, allowing precise timing of stimulation events and EEG recording.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external equipment is used for stimulus presentation and EEG recording, then timing precision can be improved, but device complexity increases and portability is reduced
Solution Approach 1:
The patent combines stimulus presentation and EEG recording functions into a single integrated wearable device. The wearable EEG system incorporates both the EEG sensors and the stimulus presentation interface (display and/or audio output) in one portable unit, eliminating the need for separate external equipment while maintaining timing synchronization through internal clock coordination between components.
2Measurement precision
If external equipment is used for stimulus presentation and EEG recording, then measurement capability is improved, but ease of operation deteriorates due to multiple devices
Solution Approach 1:
The wearable device is designed to perform multiple functions simultaneously: EEG signal acquisition, stimulus presentation (visual and/or auditory), and timing synchronization. This multi-functional integration allows the system to operate as a complete cognitive testing solution in a single portable unit, improving ease of operation while maintaining measurement precision.
3Adaptability or versatility
If separate devices are used for stimulus presentation and EEG recording, then functional capability is improved, but timing synchronization deteriorates
Solution Approach 1:
The system implements timing synchronization through feedback mechanisms where the wearable device monitors and coordinates the timing of stimulus presentation with EEG signal acquisition. The device uses internal clocks and timing protocols to ensure that stimulus events and corresponding EEG responses are precisely aligned in time, maintaining accurate event-related potential measurements.
Data Source
AI summary
Devices and methods for analyzing and monitoring electroencephalographic (EEG) electrical activity evoked during neurocognitive tests using event-related potential (ERP) and evoked and induced EEG oscillations (ERO) measures in human users. Electroencephalography (EEG) devices in the form of wearable apparatus with headphones and cognitive test interface with concurrent EEG monitoring and evaluation of electrical activity generated by a person's brain during stimulation are described, along with description of methods for testing person's cognitive and physiological state during cognitive tests using the provided devices. EEG sensors for detecting EEG responses during cognitive tests using event-related potentials (ERP) and evoked and induced EEG oscillations (ERO) for evaluation of user's cognitive status and functional outcomes of treatment. Additionally, devices and sensors for monitoring heart rate, heart rate variability (HRV), electrocardiogram (EKG), and photoplethysmography (PPG), and analysis of evoked heart rate, HRV, and pulse volume responses during cognitive tests. The devices may be used to assess psychophysiological responses and assist users with monitoring mental performance, cognitive function, stress, anxiety, fatigue, mood, behavioral performance and mental focus and acuity.