Hybrid BCI Controller for Accurate Visual Focus Validation
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Solution Overview
Problem
Existing visual brain-computer interfaces (BCIs) struggle to accurately determine which visual stimulus a user is focusing on, especially when multiple stimuli are present, and conventional input mechanics can be inconvenient or limiting for certain users.
Innovation Solution
A human interface system combining a physical controller with a brain-computer interface, where visual stimuli are modulated to elicit distinct neural responses, allowing the system to determine the user's focus and validate intentions by correlating electrical signals with stimulus characteristics, and integrating this data with physical controller inputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If visual stimuli are presented simultaneously to determine user focus, then the system can identify the object of focus through neural responses, but it becomes nearly impossible to accurately infer which specific stimulus is under focus when multiple stimuli are present
Solution Approach 1:
The patent applies periodic action by presenting visual stimuli in a time-multiplexed manner rather than simultaneously. Each stimulus is presented at a different time point, and the system measures neural responses at corresponding time points. This temporal separation allows the system to associate specific neural responses with specific stimuli, solving the problem of determining which stimulus is the object of focus when multiple stimuli are present.
2Ease of operation
If conventional input devices are used, then users can control external objects, but the interaction method becomes inconvenient or limiting for certain users
Solution Approach 1:
The patent implements universality by creating a brain-computer interface system that can serve multiple user needs and interaction scenarios. The system uses visual stimuli with different temporal characteristics (flickering patterns, duty cycles, frequencies) to elicit distinct neural responses, allowing it to identify and respond to user intent across various contexts. This multi-functional approach enables the system to adapt to different users and interaction requirements beyond what conventional input devices provide.
3Speed
If visual stimuli flicker at high rates to provide distinguishable characteristics, then neural responses can be measured with good temporal resolution, but the visual comfort and usability deteriorates
Solution Approach 1:
The patent applies parameter changes by systematically varying temporal parameters of visual stimuli (flicker rate, duty cycle, frequency) to optimize both measurement quality and user comfort. Instead of using uniformly high flicker rates, the system adjusts these parameters based on the specific measurement requirements and user response, allowing it to achieve good temporal resolution while minimizing visual discomfort. This parameter optimization resolves the contradiction between measurement speed and visual comfort.
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
Enhances user interaction by providing an intuitive and efficient method to control external objects, reducing energy consumption and enabling seamless interaction for users who may struggle with conventional input devices.
Implementation Method 1
neural responses to a target stimulus, generally among a plurality of generated visual stimuli presented to the user, are used to infer (or 'decode') which stimulus is essentially the object of focus
Implementation Method 2
Surface EEG makes it possible to measure the variations of diffuse electric potentials on the surface of the skull (i.e. the scalp) of a subject in real-time
Data Source
AI summary
A human interface system comprising a physical controller configured to receive input from a user and a brain-computer interface in which visual stimuli are presented such that the intention of the user can be validated. The input data from the physical controller is combined with input data from the brain-computer interface to provide hybrid input which may be used to control one or more external real or computer-generated objects. Method of operating said human interface device.