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Human face perception-based steady-state visual evoked potential brain-computer interface method

A steady-state visual evoked, computer-interface technology, applied in the field of brain-computer interface, can solve the problem of difficulty in improving the signal-to-noise ratio of evoked response to steady-state visual evoked potential brain-computer interface performance, etc., to achieve enhanced visual attention, enhanced response, The effect of improving performance

Inactive Publication Date: 2018-03-02
INST OF BIOMEDICAL ENG CHINESE ACAD OF MEDICAL SCI
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Problems solved by technology

However, the above methods are still difficult to improve the signal-to-noise ratio of the evoked response and the performance of the steady-state visual evoked potential brain-computer interface

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  • Human face perception-based steady-state visual evoked potential brain-computer interface method

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Embodiment Construction

[0029] Embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0030] A steady-state visual evoked potential brain-computer interface method based on human face perception, comprising the following steps:

[0031] Step 1. Use the EEG acquisition device to record the user's EEG signal, and transmit it to the computing computer in real time.

[0032] In this step, the EEG acquisition device includes a measuring electrode, a ground electrode and a reference electrode, and the measuring electrodes are placed at PO7, PO5, PO3, POz, PO4, PO6, PO8, O1, Oz, and O2 in the occipital region of the user's brain, The distribution of measuring electrodes conforms to the international 10-20 system; the ground electrode is placed at the position of FPz, and the reference electrode is placed at the position of Cz on the top of the head, such as figure 1 shown.

[0033] The electroencephalogram signals measured by the ele...

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Abstract

The invention relates to a human face perception-based steady-state visual evoked potential brain-computer interface method. The method is technically characterized by comprising the steps of recording an electroencephalogram signal of a user by using an electroencephalogram collection device, and transmitting the electroencephalogram signal to a calculation computer in real time; adopting a humanface perception coding method as a steady-state visual evoked potential evoking mode by a stimulation computer and generating a stimulation sequence; according to the stimulation sequence, generatingmultiple different stimulation frequencies, and performing coding by using the stimulation frequencies to obtain multiple different target blocks; preprocessing the obtained electroencephalogram signal by the calculation computer, and performing frequency identification on the preprocessed electroencephalogram signal by adopting an electroencephalogram decoding algorithm; and outputting a controlcommand corresponding to an identified frequency component to a feedback computer. According to the method, human face information of happy expressions is introduced in visual stimulation, so that the user visual attention can be enhanced, the signal-to-noise ratio of an evoked response is increased, the performance of a steady-state visual evoked potential brain-computer interface is improved, and a foundation is laid for promoting a practical process of the brain-computer interface.

Description

technical field [0001] The invention belongs to the technical field of brain-computer interface, in particular to a steady-state visual evoked potential brain-computer interface method based on human face perception. Background technique [0002] Steady-state visually evoked potential brain-computer interfaces have attracted much attention due to less training time, ease of use, and high information transfer rate. Currently, frequency coding is the most commonly used method for constructing a steady-state visually evoked potential brain-computer interface. In this type of system, the user only needs to fixate on a certain target block among multiple flickering blocks encoded by different stimulation frequencies, and the target block that the user is looking at can be identified by analyzing the recorded steady-state visual evoked potential signal. In this way, the steady-state visual evoked potential brain-computer interface can directly translate the intention of brain act...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/01
CPCG06F3/015
Inventor 陈小刚徐圣普
Owner INST OF BIOMEDICAL ENG CHINESE ACAD OF MEDICAL SCI
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