Control method for movement of two-dimensional cursor of brain machine interface based on motor imageries

Abstract

The invention discloses a control method for the movement of a two-dimensional cursor of a brain machine interface based on motor imageries, which only selects three types of motor imageries. The control method comprises the following steps of: 1, an electroencephalograph of a subject is transmitted to signal amplifying equipment through an electrode on an electrode cap; 2, the signal amplifying equipment amplifies and preprocesses the signal; 3, a computer terminal carries out feature extraction on the electroencephalograph by adopting a common spatial pattern algorithm; 4, pattern classification is carried out by using a support vector machine algorithm to obtain three output probabilities; 5, control command distribution and command translation are carried out on classified results by applying a control method for mapping the probabilities to vectors and combining the vectors; and 6, a translated control command is transmitted to a cursor control interface, and the movement of a cursor is displayed according to the control command to finish the whole control process. The control method has the beneficial effects that the movement of the two-dimensional cursor in a plane is controlled by adopting the three types of motor imageries, the imaginary burden of the subject is reduced, the use by the subject is facilitated, and the application field of a BCI (Brain Computer Interface) system is broadened.

Description

technical field [0001] The invention relates to a control method in the fields of biomedical engineering, computer and signal and information processing, in particular to a control method based on motion imagery brain-computer interface two-dimensional cursor movement. Background technique [0002] In recent years, brain-computer interface technology (BCI) has attracted much attention. Brain-computer interface (BCI) is a novel human-computer interface technology. In the BCI system, the information and commands sent by the individual to the outside world do not pass through the normal peripheral nerve and muscle output pathways of the brain. Using this advanced communication technology to control the movement of external objects in a plane (two-dimensional) or space (three-dimensional) through the human brain, and to achieve the control effect of "things follow the heart", has always been a hot issue in this field of research. [0003] Motor imagery (MI)-based BCI utilizes μ...

AI Technical Summary

Problems solved by technology

However, when controlling the movement of the two-dimensional cursor, it is usually necessary to provide two control commands in the horizontal and vertical directions, and the use of the three types of motor imagery brain-computer interface will lack one type of control command, and if the use of the four types of motor imagery brain-computer interface The interface outputs four command controls, which will increase the requirements for the subjects and prolong the training period for the subjects

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