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Dual stimulation method of visual evoked brain-computer interface based on coded modulation

A visual induction, coding modulation technology, applied in the field of biomedical engineering brain-computer interface, can solve problems such as difficulty in meeting the practical requirements of brain-computer interface, reducing stimulation period, and long brain-computer interface window period

Active Publication Date: 2020-10-23
HEBEI UNIV OF TECH
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  • Description
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  • Application Information

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Problems solved by technology

To ensure the accuracy of recognition, the cyclic shift of the code must be more than 4 bits, which makes the brain-computer interface system must increase the length of the binary code if it wants to increase the number of instructions. Too long a binary code will reduce the stimulus. cycle, so that the window period of the brain-computer interface is longer, which is obviously difficult to meet the requirements of the practical application of the brain-computer interface

Method used

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  • Dual stimulation method of visual evoked brain-computer interface based on coded modulation
  • Dual stimulation method of visual evoked brain-computer interface based on coded modulation
  • Dual stimulation method of visual evoked brain-computer interface based on coded modulation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0054] 1) There are 18 stimulation targets on the stimulation interface used in this example, arranged in 3 rows and 6 columns; among them, 9 targets in 3 rows and 3 columns on the left are flashing stimuli, and 9 targets in 3 rows and 3 columns on the right are sliding stimuli. Stimulus targets are numbered 1 to 18 from top to bottom and left to right. All stimuli are modulated by a binary code. When the binary code is 1, the stimulus picture of the flashing stimulus appears, and the stimulus picture of the sliding stimulus slides; when the binary code is 0, the stimulus picture of the flashing stimulus disappears, and the stimulus picture of the sliding stimulus does not move . The 36-bit binary code conducts a stimulus as a single stimulus, and the duration of a single stimulus is 3 seconds. One single stimulus is defined as a "repeat", and there is a rest period of 1 second between "repetitions", defining 18 A "repeat" is a "repeat group".

[0055] 2) The experiment is d...

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Abstract

The invention relates to a dual stimulation method of a visual evoked brain-computer interface based on coded modulation. The method firstly employs self-made robot images which include a flicker stimulation image and a sliding stimulation image, and the robot images are far better than pure-color images in terms of inducing electroencephalogram; secondly, a flicker stimulation and sliding stimulation dual-stimulation method is designed, the dual-stimulation method reduces the induction period of electroencephalogram signals, and the instruction output speed of the electroencephalogram signalsis increased; and thirdly, the same binary code is used for simultaneously modulating flicker stimulation and sliding stimulation, and electroencephalogram signals induced by the two stimulation modes are different and can be distinguished, so that the length of the binary code is reduced, and the number of instructions is doubled.

Description

technical field [0001] The invention belongs to the technical field of biomedical engineering brain-computer interface, and relates to a way of eliciting event-related potentials, in particular to a dual stimulation method for visually inducing a brain-computer interface based on coded modulation. Background technique [0002] Due to accidents, diseases, etc., some people lose part or even all of the ability to communicate information, and the normal information transmission between the central nervous system and effectors is hindered, resulting in the inability to express and realize people's action intentions. This type of patient group has lost the normal way to communicate with the outside world, thus becoming a self-enclosed individual. The emergence of the brain-computer interface has great practical significance for them to rebuild the information pathway of communicating with the outside world. [0003] The brain-computer interface is a system that detects central n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/0476A61B5/0484
CPCY02D10/00
Inventor 李梦凡伍凌宇廖文喆杨光
Owner HEBEI UNIV OF TECH
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