Contrast sensitivity detection method based on motion visual evoked potential

A technology of visual evoked potentials and detection methods, which is applied in the fields of brain-computer interface and ophthalmic optical inspection, can solve problems such as signal quality degradation and visual fatigue, and achieve the effects of reducing visual fatigue, high accuracy, and improving interactive performance

Inactive Publication Date: 2019-09-20
XI AN JIAOTONG UNIV
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Problems solved by technology

In addition, traditional checkerboard and raster SSVEP or PVEP paradigms are more likely to cause visual fatigue, resulting in reduced signal quality

Method used

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  • Contrast sensitivity detection method based on motion visual evoked potential
  • Contrast sensitivity detection method based on motion visual evoked potential
  • Contrast sensitivity detection method based on motion visual evoked potential

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Embodiment Construction

[0024] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0025] A method for detecting contrast sensitivity based on motor visual evoked potentials, comprising the following steps:

[0026] 1) Concentric ring stimulation paradigm: Using the most practical method of SSMVEP in the brain-computer interface, use Psychophysics Toolbox programming to draw the periodic contraction and expansion movement of the paradigm pattern texture through MATLAB, which can stably stimulate SSMVEP; refer to figure 1 , the moving stimulus target appears as a light and dark concentric ring, and the distance between the bright area and the dark area is equal; during the stimulus presentation process, the overall brightness and overall size of the paradigm remain unchanged; the phase of the ring contracts and expands in a sinusoidal manner, where:

[0027]

[0028] In the formula:

[0029] f c ——Movement frequency, that is, th...

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Abstract

A contrast sensitivity detection method based on motion visual evoked potential comprises: designing concentric ring stimulating paradigms, namely a stimulating paradigm contrast scanning gradient, setting up a brain-computer interface platform, and carrying out stimulating paradigm displaying; subjecting electroencephalogram data to feature extraction, and judging a paradigm response value by calculating SNR (signal-to-noise ratio) of canonical correlation analysis spectrum so that accuracy of SSMVEP (steady-state motion visual evoked potential) contrast sensitivity detection is improved; and feeding back out the electroencephalogram objective detection results of contrast sensitivity through a screen. A group of concentric ring scanning SSMVEP paradigms is designed herein to contrast sensitivity inspection; the corresponding threshold judging standard is provided; objective contrast sensitivity of electroencephalogram is attained; an objective quantitative measuring method can be provided for for detecting contrast sensitivity in ophthalmic testing.

Description

technical field [0001] The invention relates to the technical field of brain-computer interface and ophthalmic optical examination, in particular to a contrast sensitivity detection method based on motor visual evoked potential. Background technique [0002] Contrast sensitivity is to measure the black and white contrast (contrast) of the surface of the object when the visual system recognizes the spatial frequency (cycle / degree) of objects of different sizes. It is used to evaluate the ability of the visual system to distinguish objects of different sizes, so it is a kind of A new quantitative test of visual function. Common optometry examinations rely more on the subject's subjective feelings and cooperation. For example, contrast-sensitive examinations require the use of contrast-sensitivity difference eye charts, CSV-1000 light boxes, and other methods. These methods need to use the subject's subjective judgment as the end point of the test. For people with communicatio...

Claims

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Application Information

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IPC IPC(8): A61B3/02A61B3/028A61B5/0484
CPCA61B3/0025A61B3/022A61B3/028A61B5/316A61B5/378
Inventor 徐光华郑小伟杜成航张凯吴一帆裴晋举
Owner XI AN JIAOTONG UNIV
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