Frontal EEG Sensor Electrode Placement for Signal Detection
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Solution Overview
Problem
Traditional EEG recording techniques are cumbersome, uncomfortable, and inefficient, often requiring bulky headsets and conductive gel, and struggle to accurately detect finer brain signals like event-related potentials (ERPs) due to poor signal quality and inadequate portability.
Innovation Solution
A physiological sensor device with a substrate made of electrically insulative material, featuring a configuration of three electrodes (recording, reference, and ground) arranged along the sagittal direction on the forehead, allowing for minimal footprint and high-quality signal acquisition, integrated with a flexible and wearable design for comfortable, portable use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional EEG recording techniques are used, then brain electrical activity can be detected, but the equipment is bulky and uncomfortable
Solution Approach 1:
The patent divides the EEG recording system into a minimal set of essential components: only three electrodes (active, reference, and ground) are required instead of traditional multi-electrode arrays. This segmentation reduces device complexity while maintaining detection capability for specific brain signals like ERPs
Solution Approach 2:
The patent extracts and eliminates unnecessary components from traditional EEG systems, specifically removing the requirement for conductive gel and bulky headset structures. The invention uses a simplified electrode configuration that can function without these additional elements, reducing overall device complexity
2Measurement precision
If traditional EEG techniques are used, then brain signals can be recorded, but signal quality is poor for finer signals like ERPs
Solution Approach 1:
The patent applies local quality by optimizing the specific arrangement and positioning of the three electrodes to enhance detection of ERP signals. The electrodes are positioned at specific locations (frontal region, mastoid, and reference point) to maximize signal quality for cognitive brain responses while keeping the system simple
3Measurement precision
If traditional EEG equipment is used, then physiological signals can be detected, but portability is limited
Solution Approach 1:
The patent segments the EEG system into a minimal three-electrode configuration that can be worn as a lightweight headband or cap, eliminating the need for bulky amplifiers and processing equipment. This segmentation enables portable use while maintaining detection capability for brain signals
Solution Approach 2:
The patent extracts the essential detection function from the bulky traditional EEG system, keeping only the minimal electrode components needed for signal acquisition. The simplified design removes unnecessary weight and complexity, enabling portability for real-world applications
4Measurement precision
If traditional EEG methods are used, then brain activity can be recorded, but comfort is poor
Solution Approach 1:
The patent segments the recording system into a minimal three-electrode setup that requires minimal contact points on the user's head, reducing discomfort from excessive pressure points and conductive gel application. The simplified configuration improves ease of operation while maintaining recording accuracy
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
Enables efficient and accurate detection of cognitive and sensory performance indicators, including ERPs, with improved comfort and portability, allowing for real-world applications beyond clinical settings and providing reliable cognitive and sensory profiles.
Implementation Method 1
the electrical activity of the brain that is detected by EEG techniques can include voltage fluctuations, e.g., resulting from ionic current flows within the neurons of the brain
Data Source
Figure 1A~1B
Figure 1C
Figure 1D~1E
AI summary
Methods, systems, and devices are disclosed for acquiring and analyzing physiological signals. In one aspect, a physiological sensor device includes a substrate formed of an electrically insulative material and structured to allow physical contact of the device with the frontal region of the head of a user, a recording electrode configured at a first location on the substrate to acquire an electrophysiological signal of the user, a reference electrode configured at a second location on the substrate to acquire a reference signal to the electrophysiological signal, and a ground electrode configured at a third location at least partially between the first and the second locations on the substrate, in which the first location is posterior to the second and third locations, and in which the device is operable when electrically coupled to an electrical circuit to detect physiological signals of the user.