P300-based audio-visual dual-channel competition mechanism brain-computer interface method

A dual-channel, machine-interface technology, applied in the field of brain-computer interface, can solve the problems of insufficient BCI in audio-visual competition, and achieve the effect of perfect design

Active Publication Date: 2020-04-17
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the research on BCI of audio-visual competition is still insufficient, and the influence effect of competition effec...

Method used

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  • P300-based audio-visual dual-channel competition mechanism brain-computer interface method
  • P300-based audio-visual dual-channel competition mechanism brain-computer interface method
  • P300-based audio-visual dual-channel competition mechanism brain-computer interface method

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Embodiment 1

[0031] The embodiment of the present invention designs a brain-computer interface (BCI) paradigm under the condition of visual and auditory competition based on the P300 signal in ERP. P300 was first discovered by Sotton in 1965. It is a kind of event-related potential (Event-Related Potential, ERP) in EEG. It is called P300 because it is a positive potential that appears on the head 300ms after the evoked stimulus. Reflects changes in the cognitive state of a person. If a different visual or auditory stimulus is added to the sequence of repetitive stimuli, this stimulus is called a deviant stimulus, and the brain is elicited to respond. This application scheme combines sight and hearing, the main sensory channels of human beings, repeats the stimulus according to the oddball paradigm, and designs the stimulation paradigm to induce visual and auditory evoked potentials. Through analysis and comparison, it explores the competitive relationship between visual and auditory human ...

Embodiment 2

[0034] figure 1 It is a schematic diagram of the experimental process of the present invention. The design includes EEG electrode site selection, reference electrode placement, visual and auditory stimulation output system based on Psychtoolbox of MATLAB and Neuroscan EEG acquisition system. The subjects sat in front of the display screen presenting visual stimuli, watched the letters / pictures on the computer screen change, and at the same time output audio stimuli with headphones. Count the number of visual or auditory deviation stimuli silently. When the counting deviation is stimulated, the cognitive process of the brain will be reflected in the electrical signal of the cerebral cortex, so that an event-related potential will appear. Use the Neuroscan EEG acquisition system to collect experimental EEG, and then perform data preprocessing, feature extraction and analysis, compare the differences in event-related potentials under the experimental parameters and the differen...

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Abstract

The invention discloses a P300-based audio-visual dual-channel competition mechanism brain-computer interface method. The method comprises the following steps: setting a first normal form as an audio-visual interference normal form, and displaying visual stimulation as monosyllable letters in the center of a screen in different colors; setting a second normal form as an audio-visual irrelevant normal form, enabling the auditory stimulation to be still monosyllable letters which are the same as those of the first normal form and visual stimulation to be six geometric figures which are differentin shape and color, and enabling the patterns to have no correlation with the letters of the auditory stimulation; setting different stimulation time intervals, stimulation lengths, stimulation presentation sequences and attention modulation modes; and collecting electroencephalogram signals through 64-lead electroencephalogram electrode caps, comparing tested electroencephalogram signals under different tasks, and analyzing quantitative and positioning representation of the competitive relation between vision and auditory senses. To be specific, the auditory stimulation is the same monosyllable letters and is output in two channels of an in-ear earphone; and the sound stimulation is set to have the same semantics as the visual stimulation and have the same visual and auditory stimulationtime.

Description

technical field [0001] The invention relates to the field of brain-computer interface, in particular to a P300-based brain-computer interface method with dual audio-visual channel competition mechanism. Background technique [0002] Brain-computer interface (Brain-Computer Interface, BCI) is a new type of interaction. The brain-computer interface does not obtain information from limbs or neuromuscular, but directly from the neural electrical signals accompanied by human brain activities, establishing a human and Peripheral nerve-independent output pathways between ambients. According to the type of signal it relies on, brain-computer interface is divided into different types, among which the event-related potential-based BCI system (ERP-BCI) is considered to be relatively efficient and stable. [0003] Event-related potential (ERP) is closely related to the brain's processing of specific events. Its amplitude information is contained in the background EEG with relatively l...

Claims

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Application Information

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IPC IPC(8): A61B5/0484A61B5/12A61B3/10G06F3/01G06K9/00
CPCG06F3/015A61B5/125A61B3/10A61B5/378A61B5/38G06F2218/12
Inventor 陈露安兴伟明东杨远骋周向通柯余峰刘爽
Owner TIANJIN UNIV
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