Brain computer interface system on basis of motor imageries of different uplifting amplitudes of lower limbs
A motor imagery, brain-computer interface technology, applied in computer parts, mechanical mode conversion, input/output process of data processing, etc., can solve the problems of few types of tasks identified and inconspicuous EEG characteristics, to expand the types of number, increase the control instruction set, and enhance the effect of practicality
Inactive Publication Date: 2016-10-12
TIANJIN UNIVERSITY OF TECHNOLOGY
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[0006] The purpose of the present invention is to overcome the shortcomings of the existing motor imagery EEG features are not obvious, the number of identifiable task types is small, etc., and proposes an experimental paradigm for the specificization of lower limb motor imagery
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[0037] The invention designs a brain-computer interface system based on different amplitudes of lower limb motor imagery. The design includes EEG acquisition systems such as EEG acquisition caps and EEG amplifiers, real-time monitoring video induction and computer off-line data processing and other parts. In the experiment, the 64-channel EEG acquisition system produced by Neuroscan was used to collect EEG. During the imaginative action experiment, the subjects were asked to sit quietly on a chair about 1m away from the laptop computer displaying the video. The experiment was divided into two types of thinking The task mode was carried out, that is, imagining a slight lift of the calf and imagining a larger amplitude of the calf lift. The experimental timing and experimental environment of the two types of experiments are the same. The only difference is that the thinking task modes of the two types of experiments are different. The comparison of the differences between the tw...
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The invention discloses a brain computer interface system on the basis of motor imageries of different uplifting amplitudes of lower limbs. According to the brain computer interface system, the slight uplifting and large-amplitude uplifting of a single shank are respectively imagined on the basis of the motor imageries of different uplifting amplitudes of legs; processing is carried out on the acquired imagery electroencephalogram signals of different amplitudes; the characteristics of the signals are extracted; and the characteristic differences of the signals are compared to determine whether separability exists. The specific experimental process of the brain computer interface system is carried out as follows: a real-time monitoring video system realized by a computer display which is located in front of a user with limb movement disturbance (tested user) and a camera which is used for directly acquiring video of the tested user provides a real-time monitoring picture; the tested user can see the real limbs and movement scenes thereof through looking straight ahead when carrying out movement imagination; and movement imagination electroencephalogram signals acquired through an electroencephalogram hat are amplified through an electroencephalogram amplifier and acquired and stored through an acquisition computer and then the movement imagination electroencephalogram signals can undergo offline processing, and two experimental results are compared.
Description
technical field [0001] The invention introduces a brain-computer interface (Brain-Computer Interface, BCI) experimental paradigm based on different amplitudes of lower limb motor imagery, which belongs to the technical field of brain-computer interface and can be applied to the fields of neural engineering and rehabilitation. In particular, two new thinking task modes are proposed. Under these two thinking task modes, the subjects can concentrate and better participate in the motor imagery brain-computer interface experiment. In the motor imagery BCI, The higher the subject's attention, the better the quality of the EEG signal source. Therefore, this experimental paradigm is conducive to the acquisition of high-quality ERD / ERS features with more obvious motor imagery EEG signals. In addition, this experimental paradigm concretizes the movement of limb imagination, which is a brand-new thinking mode of motor imagination, which is expected to increase the mode of imaginary actio...
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IPC IPC(8): G06F3/01A61B5/0476
CPCA61B5/369G06F3/015
Inventor 李鹏海方振东宋延娟王丽余刘瀛涛白鑫宇浦文慧
Owner TIANJIN UNIVERSITY OF TECHNOLOGY