Brain-computer interface paradigm based on frequency-variable flicker stimulation

Abstract

The invention relates to a brain-machine interface, and provides a novel BCI visual stimulation paradigm, wherein the brain-machine interface paradigm can increase the number of controlling items to be selected of a BCI system. According to technical scheme, the brain-machine interface paradigm based on a frequency conversion flickering stimulation comprises the following steps that frequency conversion data are adopted to carry out visual stimulation to induce electroencephalogram data to be produced, electroencephalogram data are collected, after the electroencephalogram data are stored, certain pre-treatment and characteristic extraction are conducted on the electroencephalogram signal data, and finally a support vector machine is used for carrying out classified counting to judge accuracy and the information transmission rate of the brain-machine interface paradigm based on frequency conversion flickering stimulation. The expression of the frequency conversion signals is , wherein a is the speed of frequency conversion and is a constant value, f0 is the original frequency of the signals and indicates the original phase of the signals, t indicates time, and the minimum frequency of the frequency conversion signals is larger than 6 Hz. The brain-machine interface paradigm based on sfrequency conversion flickering stimulation is mainly applied to brain-machine interface design.

Description

Technical field [0001] The present invention relates to a brain-computer interface, in particular, to a brain-computer interface paradigm based on variable frequency flicker stimulation. Background technique [0002] The definition of BCI given by the first Brain-Computer Interface (BCI) International Conference is: "BCI is a communication control system that does not depend on the normal output channels of the brain's peripheral nerves and muscles." Current research results It mainly collects and analyzes human brain electrical signals in different states, and then uses certain engineering techniques to establish a direct communication and control channel between the human brain and a computer or other electronic equipment, thereby realizing a brand new The technology of information exchange and control can provide a way to communicate and control information with the outside world for the disabled, especially those patients who have lost basic limb motor functions but have norm...

AI Technical Summary

Problems solved by technology

Under the constraints of various factors, the number of flicker stimuli that can stably induce SSVEP EEG signals in the experiment is still very limited, that is, the control options are limited

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