Movement visual evoked potential brain-machine interface method appeared based on high refresh rate

Abstract

The invention discloses a movement visual evoked potential brain-machine interface method appeared based on a high refresh rate. Annular checkerboard steady-state shrinkage and extension movement simulation is used for evoking a steady-state movement visual evoked potential, multiple simulation targets are displayed in display equipment with the high refresh rate via a full-period intercepted simulation drawing method, coupling of flicker stimulation is released, an EEG signal can be evoked by the single movement stimulation, electrodes are deployed on the head of a user, a simulation operation module draws and distributes movement simulation patterns according to a set parameter, an EEG response of the user is evoked after the user is simulated by a simulation display module, and after anEEG collection and analysis module processes the response, a recognition result is acquired and fed back. According to the method provided by the invention, the situation that the user does not havesignificant feeling of fatigue when in long-term use is ensured, and the practicability of the brain-machine interface technology is increased.

Description

technical field [0001] The invention relates to the technical field of neuroengineering and brain-computer interface in biomedical engineering, and in particular to a motor visual evoked potential brain-computer interface method based on high refresh rate presentation. Background technique [0002] Brain-computer interface technology is a means of information exchange that can directly interact with external environmental devices without relying on the peripheral neuromuscular channels of the human body. This technology has developed rapidly in the last ten years and has been gradually applied in medical, military, entertainment and other fields. Brain-computer interface technology includes a variety of methods, such as motor imagery (Motor imagery, MI), P300 event-related potential, slow cortical potential (SCP) and so on. Among them, the steady-state visual evoked potential method (SSVEP) is one of the most commonly used methods due to its high recognition accuracy and sm...

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Problems solved by technology

[0003] However, the current steady-state visual evoked potential method mainly uses light flicker stimulation, which requires the user to stare at the strong light-dark contrast change process, which is very easy to cause the user's visual fatigue and discomfort, resulting in the reduction of the user's brain response signal, limiting the brain Practical application of machine interface

The Chinese patent "Application No. 201410840161.1, titled A Brain-Computer Interface Method Based on High-Frequency Flashing Emotional Stimulation" makes emotional pictures flicker in the high-frequency band of EEG signals around 40Hz, and uses high-frequency stimulation to reduce fatigue, but The evoked strength and signal-to-noise ratio are low, and the accuracy rate is limited; the Chinese patent "Application No. 201210165248.4, titled Steady-state Evoked Potential Brain-Computer Interface Method Based on Motion Flip Visual Perception", uses Newton ring motion stimulation to reduce induced fatigue , but because the stimulation center still has periodic light-dark contrast changes, the complex effect of light flicker stimulation and nuclear motion stimulation makes the evoked signal more complicated, reduces the recognition effect, and limits its practical development.

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