Brain-computer interface method based on additional Chinese character tacit reading motor imagery mode
A motion imagery and computer interface technology, applied in the field of biomedical engineering brain-computer interface, can solve problems such as poor classification effect of classifiers, and achieve the effect of improving recognition accuracy, enriching task paradigms, and improving practicability
Inactive Publication Date: 2021-04-30
HEBEI UNIV OF TECH
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[0006] The purpose of the present invention is to hope to be able to solve the existing problems of the above-mentioned MI-BCI system in practical application to a certain extent, to provide a kind of MI experimental paradigm of silent reading of Chinese characters, and to combine the two advanced cognitive activities of language and imagination in Together, and extract the effective features in the EEG induced by this combination method as the manipulation input of the BCI system, which enriches the task paradigm of the EEG and improves the classification accuracy; A method for determining the EEG filter interval based on an event-related spectral perturbation algorithm, through which the optimal filter interval for each user can be determined for the EEG filter processing, thus making up for the classification caused by individual differences among users to a certain extent. The problem of poor classification effect
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[0026] The method of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0027] The hardware equipment for the experiment using the method of the present invention requires a 64-lead electrode cap, an EEG acquisition instrument, a signal amplifier, and a computer, and the software equipment requires curry8 and Eprime. The experiment needs to be completed in a quiet environment with low light levels. At the same time, the subjects are required to ensure adequate sleep, good mental state and clean hair before the experiment. Before the start of the experiment, explain the whole process of the experiment and the corresponding imaginary tasks to each subject to ensure that the subjects are fully aware of the process before starting the experiment.
[0028] The present invention adopts the Eprime software to design the static text stimulation mode of four Chinese characters (as shown in the figure), and requires each subject to c...
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The invention relates to a brain-computer interface method based on an additional Chinese character tacit reading motor imagery mode. The method comprises the steps: adopting a static character stimulation mode to determine a stimulation interface with four Chinese characters with different meanings, and enabling a user to perform a corresponding additional Chinese character tacit reading motor imagery task according to the prompt of the interface, wherein the single test comprises four stages: an idle stage, a preparation stage, a prompt stage and an imagination stage. In the idle stage, the tested person is allowed to adjust the relaxation state within 2000ms; in the preparation stage, 1000ms is used for reminding the tested person to enter the prompt stage immediately, and attention needs to be kept; in the prompting stage, 1000ms randomly stimulates a certain static character to be tested; and in the imagination stage, 4000ms requires the tested heart to read the Chinese characters prompted in the prompting stage and complete corresponding imagination tasks at the same time. And after the imagination period, the single test is ended.
Description
technical field [0001] The invention belongs to the technical field of biomedical engineering brain-computer interface, and in particular relates to a spontaneous EEG experiment paradigm based on motor imagery with additional Chinese character silent reading. Background technique [0002] Brain Computer Interface (BCI) is an information transmission technology that realizes the direct interaction between the brain and external devices by decoding the information of human brain nerve activity, and has received extensive attention in recent years. The realization of BCI technology is to convert the electrophysiological activity characteristics of the cerebral cortex into pre-set instructions, and then realize the control of the brain on external devices. Nowadays, BCI technology has been applied in many fields such as military affairs, medical treatment and entertainment. For example, in the military field, electroencephalogram (EEG) can be used to assist in the control of we...
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IPC IPC(8): G06F3/01G06N3/04
CPCG06F3/015G06N3/045
Inventor 郭苗苗金铭吉利辉张天恒王子威
Owner HEBEI UNIV OF TECH