Brain-machine interface paradigm based on frequency conversion flickering stimulation

A computer interface and paradigm technology, applied in the field of brain-computer interface, can solve problems such as limited and limited control options, and achieve the effect of high signal-to-noise ratio and high stability

Active Publication Date: 2013-11-20
TIANJIN UNIV
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  • Abstract
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  • Claims
  • Application Information

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

Method used

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  • Brain-machine interface paradigm based on frequency conversion flickering stimulation
  • Brain-machine interface paradigm based on frequency conversion flickering stimulation
  • Brain-machine interface paradigm based on frequency conversion flickering stimulation

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Experimental program
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Embodiment Construction

[0016] A brain-computer interface (BCI) paradigm for visual stimulation based on variable frequency signal modulation is designed. When a normal person is stimulated by a flicker of a certain frequency (generally greater than 6Hz), there will be a response consistent with the stimulation frequency or its harmonics in the corresponding EEG. This response is the so-called Steady State Visual Evoked Potential (SSVEP). If the stimulation frequency is changed in a specific pattern, the frequency characteristics of the EEG signal will also produce a corresponding change pattern. The design of the device changes the traditional single-frequency visual stimulation mode into a visual stimulation mode modulated by frequency-variable signals, thereby inducing corresponding frequency-variable visual evoked potentials.

[0017] The technical process is: design a new paradigm experiment, build the EEG signal acquisition device required for the experiment, and then collect the operator’s EEG...

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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 frequency-variable 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 In the results, it mainly collects and analyzes human EEG signals in different states, and then uses certain engineering techniques to establish a direct communication and control channel between the human brain and computers or other electronic devices, thereby realizing a kind of The brand-new information exchange and control technology can provide a way for the disabled, especially those who have lost basic limb motor functions but normal thinking, to communicate and control information with the outside world....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/01
Inventor 许敏鹏马岚綦宏志张力新万柏坤明东
Owner TIANJIN UNIV
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