VR Gravity Perception Testing With Eye Tracking and Posture Sensing
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Solution Overview
Problem
Existing gravity perception function inspections are inefficient due to large space requirements and limited evaluation of visual and somatosensory contributions, primarily focusing on otolith organ function without considering visual information, and lack the ability to assess perception abilities like dementia.
Innovation Solution
A gravity perception function inspection apparatus using a virtual/augmented reality interface and bio-signal measuring devices, including a head-wearable display, eye tracker, posture measuring device, and electroencephalogram, to evaluate gravity perception through visual-vestibular interaction and somatosensory integration, providing miniaturized and portable inspections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a known inspection method using a long bar and dark field is used to evaluate otolith organ function, then gravity perception accuracy can be measured, but the inspection space requirement becomes very large and inspection efficiency decreases
Solution Approach 1:
The patent replaces the physical long bar with a virtual rod displayed through a head-mounted display device. The virtual rod is projected into the user's visual field, eliminating the need for a physical 1-meter long bar and dark field environment. This copying approach maintains the measurement function while dramatically reducing space requirements.
Solution Approach 2:
The patent substitutes the mechanical measurement system (physical bar, dark field chamber, manual alignment) with an electronic/optical system. The head-mounted display presents visual stimuli, sensors detect eye movements and head orientation, and a processor automatically calculates gravity perception error. This replacement eliminates space constraints while maintaining measurement precision.
2Measurement precision
If only otolith organ function is evaluated through vestibular inspection, then gravity perception can be assessed, but visual and somatosensory contributions remain unevaluated
Solution Approach 1:
The patent creates a multi-functional evaluation system that simultaneously assesses multiple sensory systems. The head-mounted display presents visual stimuli, inertial sensors detect head movements, and the system processes data to evaluate both vestibular function and visual-vestibular interaction. This universal approach allows comprehensive gravity perception assessment including otolith organ function, visual contribution, and somatosensory integration in a single inspection platform.
3Area of stationary object
If a portable and miniaturized inspection device is created using virtual reality interface, then inspection space is minimized, but the complexity of integrating multiple sensors and processing systems increases
Solution Approach 1:
The patent merges multiple functional components into an integrated head-mounted display system. The display device, eye tracking sensors, inertial measurement units, and processing electronics are combined into a single portable unit worn on the user's head. This merging approach consolidates complex functionality into a compact form factor, reducing inspection space while managing system complexity through integration rather than separate components.
Solution Approach 2:
The system employs automatic calibration and processing algorithms that eliminate the need for manual setup and interpretation. The sensors automatically detect head position and eye movements, the processor automatically calculates gravity perception errors, and the system provides automated results. This self-service capability reduces the operational complexity despite the sophisticated sensor integration, making the portable system easier to use.
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 miniaturized and portable evaluations of gravity perception, accurately assessing visual-vestibular interaction and perception abilities, including dementia screening, with improved accuracy and flexibility in various environments.
Implementation Method 1
a posture measuring device that infers a posture value of the examinee by using a plurality of inertial measurement sensors dispersedly arranged on a body of the examinee
Implementation Method 2
an electroencephalogram measuring device that measures response of a brain nervous system of the examinee
Data Source
AI summary
A gravity perception function inspection apparatus based on virtual/augmented reality and multiple bio-signal sensors, includes a head-wearable display device worn on an examinee's head and reproducing an inspection screen in which a target object is displayed in a center of the inspection screen, the bio-signal measuring device including an eye tracker that detects a pupil size of an examinee and a posture measuring device that infers a posture value of the examinee by using a plurality of inertial measurement sensors dispersedly arranged on a body of the examinee and obtains and outputs a position control value corresponding to the posture value of the examinee, a human interface device that obtains and outputs a position control value manually input by the examinee, and a control device that generates and provides the inspection screen.