Target selecting method based on transient visual evoked electroencephalogram

Abstract

The invention relates to a target selecting method based on transient visual evoked electroencephalogram, comprising the following steps: VC + + writing visual stimulator evokes an electroencephalogram signal, 16-lead collecting device collects an electroencephalogram signal VEP which is amplified by an electroencephalogram amplifier and A / D converted, so that the signal is input into a computer and memorized in a memorizer in a way of signal voltage magnitude; B sample band biorthogonal wavelet method is used for extracting an electroencephalogram characteristic signal, in addition, corresponding results are classified, identified and output by the self-learning ability of BP neuronic network; wherein, the method also comprising the following steps of: designing the accurate timing visual stimulator by CPU timestamp; answering the output impulse of paralled port; collecting the electroencephalogram signal VEP by a collecting device; pretreating the collected signal; extracting the electroencephalogram signal by the B sample band biorthogonal wavelet method; and classifying characteristic quantity by the BP neuronic network. The method has the advantage that the BP neuronic network is used for effectively improving signal to the noise ratio and the recognition rate of visual evoked potential VEP.

Description

technical field [0001] The invention relates to a brain-computer interface (Brain-computer interface, BCI) device, which uses a precisely timed visual stimulator to generate transient visual evoked potentials for human visual stimulation, and performs feature extraction and classification on the evoked potentials, specifically related to sample B The method of feature extraction and classification combined with biorthogonal wavelet method and BP neural network. Background technique [0002] Brain-computer interface (Brain-computer interface, BCI) or brain-computer interface is a human-computer interface method, which is a system that realizes communication and control between the human brain and computers or other electronic devices based on EEG signals. BCI does not depend on the normal output pathways of the brain (peripheral nervous system and muscle tissue), and is a brand new way of communication and control. The research of BCI is of great significance. An important ...

AI Technical Summary

Problems solved by technology

Both P300 and VEP are evoked potentials and do not require training. Since evoked potentials appear at a specific time, their signal detection and processing methods are relatively simple and have a high accuracy rate. a certain perception (such as vision)

[0014] Although the above methods can realize the extraction of EP / ERP to a certain extent, these methods either assume that there is an error with the real situation, or the calculation process is too complicated, and cannot solve the problem of evoked potential extraction well.

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