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State feedback based adaptive control method for brain-computer communication speed

A technology of adaptive control and communication rate, applied in computer components, mechanical mode conversion, input/output of user/computer interaction, etc., can solve problems such as information transmission rate constraints and limitations, improve concentration and reduce errors Use, improve the effect of information transmission rate

Active Publication Date: 2013-12-11
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0006] Since the number of commands of the above two BCI systems is limited, the improvement of the information transmission rate is greatly restricted

Method used

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  • State feedback based adaptive control method for brain-computer communication speed
  • State feedback based adaptive control method for brain-computer communication speed
  • State feedback based adaptive control method for brain-computer communication speed

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Embodiment Construction

[0040] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0041] In order to evaluate BCI performance, three factors must be considered: speed, accuracy and number of options. Information Transfer Rate (Information Transfer Rate, ITR, also known as "communication rate") is widely used in BCI research due to the comprehensive evaluation of these three factors. However, the controller must have error correction function in practical application process. During online use, if an error occurs, at least two additional control commands are required, one for deleting the error output and one for the selection of the correct command. Therefore, according to the control characteristics of the system, the present invention adopts the actual information transmission rate (ie PITR) as the most effective index for optimal design. The unit of PITR is bits / min, which represents the amount of information ...

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Abstract

The invention discloses a state feedback based adaptive control method for brain-computer communication speed. The method comprises the following steps of: (1) applying visual stimulation of fixed-frequency blinking in a Phase1 mode; (2) executing a system objective identification process; (3) judging whether the maximum value of mixed characteristics exceeds a threshold value set by a system; (4) judging whether an objective control key for system identification in the Phase1 mode is 'del', if not, ending the selection of the Phase1 mode, and storing row coordinate of the objective control key by the system; (5) enabling the system to enter in a fixed-frequency blinking stage in a Phase2 mode and executing the system objective identification process; (6) judging whether the maximum value of the mixed characteristics in the system objective identification process in the Phase2 stage exceeds the threshold value set by the system, if so, entering in the step (7); (7) judging whether the objective control key for system identification in the Phase2 stage is 'del', and finally outputting a control command. The method disclosed by the invention is based on a simple principle, is simple and convenient to implement, high in control accuracy and capable of improving the system information transfer rate.

Description

technical field [0001] The present invention mainly relates to the technical field of brain-computer interface, in particular to an adaptive control method of brain-computer communication rate based on state feedback. Background technique [0002] Brain-Computer Interface (BCI) is a new human-computer communication system that does not depend on the participation of peripheral nerves and muscles. It recognizes people's intentions by detecting and distinguishing the spatiotemporal patterns corresponding to different brain activities in EEG signals, and converts them into digital signals that can be recognized and executed by computers, and establishes direct communication between the human brain and peripheral devices . At present, BCI has broad application prospects in the fields of disability assistance, rehabilitation engineering, weapon equipment research and development, entertainment, etc., and has attracted extensive attention from domestic and foreign researchers. ...

Claims

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Application Information

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IPC IPC(8): G06F3/01
Inventor 周宗潭印二威姜俊刘亚东胡德文
Owner NAT UNIV OF DEFENSE TECH
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