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Brain-computer interface method based on SSVEP (Steady State Visual Evoked Potential) blocking and P300 bicharacteristics

A computer interface and EEG signal technology, applied in the field of medical equipment, can solve the problem of unhelpful judgment accuracy, achieve the effects of avoiding conflicts, considerable social and economic benefits, and improving the accuracy of single-task judgment

Active Publication Date: 2012-11-14
TIANJIN UNIV
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Problems solved by technology

The advantage of this system is to use the SSVEP feature signal as the state switch of the subject, but it is still not beneficial to improve the judgment accuracy of the task

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  • Brain-computer interface method based on SSVEP (Steady State Visual Evoked Potential) blocking and P300 bicharacteristics
  • Brain-computer interface method based on SSVEP (Steady State Visual Evoked Potential) blocking and P300 bicharacteristics
  • Brain-computer interface method based on SSVEP (Steady State Visual Evoked Potential) blocking and P300 bicharacteristics

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Embodiment Construction

[0023] The present invention designs a brain-computer interface paradigm based on dual features of SSVEP blocking and P300. When normal people are stimulated by flickering at different frequencies (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; P300 is in the target A positive peak appears in the EEG about 300ms after the probabilistic target stimulation; SSVEP blocking is a phenomenon in which the energy of the SSVEP signal appears in the new paradigm of SSVEP and P300 fusion when the target stimulation occurs. The brain-computer interface designed based on the dual-feature paradigm effectively combines the blocking feature of SSVEP and the P300 feature to recognize characters, in order to improve the single-task judgment accuracy of the BCI system. The technical process is: design a new paradigm experiment, build the...

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Abstract

The invention relates to the field of medical apparatuses. For realizing the aim of simultaneously evoking the SSVEP (Steady State Visual Evoked Potential) blocking characteristic and the P300 characteristic, and separating the two characteristics in space and frequency domain (wherein the effective combination of the two different characteristic signals can obviously improve the single task judging accuracy of a BCI (Brain-Computer Interface) system), the invention adopts the technical scheme that a brain-computer interface method based on SSVEP blocking and P300 bicharacteristics is provided. The method comprises the following steps of: evoking the bicharacteristics by visual stimulation, acquiring and storing the generated electroencephalogram signal, preprocessing the electroencephalogram signal, extracting corresponding SVEP blocking and P300 characteristic signals, and classifying the signals by linear discriminant analysis, thereby using the characteristics in pattern recognition of experimental tasks. The method provided by the invention is mainly used for design and manufacture of medical apparatuses.

Description

technical field [0001] The invention relates to the field of medical devices, in particular to a brain-computer interface method based on dual features of SSVEP blocking and P300 adopted in the field of medical devices. 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 i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/01
Inventor 陈龙许敏鹏柯余峰李南南綦宏志万柏坤明东
Owner TIANJIN UNIV
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