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Quick near-infrared brain-computer interface method

A brain-computer interface, near-infrared technology, applied in mechanical mode conversion, computer components, input/output of user/computer interaction, etc. lower problem

Active Publication Date: 2015-02-25
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

Due to the unavoidable hemodynamic response delay (for example, the peak of oxygenated hemoglobin concentration change in motor imagery reported in the literature occurs 8-10 seconds after task initiation), and the lack of effective processing of this raw physiological signal The existing near-infrared brain-computer interface can only extend the time of each task in use to avoid signal overlap, so the information transmission rate of the existing near-infrared brain-computer interface is very low, which affects its practical application. Further development

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  • Quick near-infrared brain-computer interface method

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Embodiment approach

[0038] like figure 2 As shown, the user sits directly in front of the brain-computer interface task presentation interface 4, and completes the motor imagery task according to the interface prompts. The timing of each task is as follows: figure 2 shown. 2 seconds before each task, a "+" appears on the screen to remind the user that the task is about to start; in the next 4 seconds, an arrow pointing to the left or right appears randomly on the screen, and the user imagines the corresponding left or right side according to the direction of the arrow The movement of body parts; the screen is black for the last 2 seconds, and the user stops imagining and remains in a calm state of rest. The total duration of the entire task was 8 seconds, and the imagery task for each body part appeared randomly 50 times. After the multi-channel fast event-related near-infrared optical brain signal is collected by the multi-channel near-infrared optical brain signal acquisition system 1 when ...

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Abstract

The invention discloses a quick near-infrared brain-computer interface method. The method is mainly characterized in that a multi-channel near-infrared optical brain signal collecting system is used for obtaining multi-channel near-infrared optical brain signals generated by a user in the brain-computer interface task executing process in real time, after the signals are pre-processed, feature space transformation is carried out to extract feature vectors, and mode recognition is carried out to judge the type of a brain-computer interface task executed by the user. The method has the advantages that the recognition rate and recognition speed of brain-computer interface tasks are obviously improved compared with a traditional near-infrared brain-computer interface method which carries out recognition with amplitude as feature vectors.

Description

technical field [0001] The invention relates to the field of brain-computer interface and auxiliary rehabilitation of disabled persons, in particular to a fast near-infrared brain-computer interface method. Background technique [0002] Functional near-infrared spectroscopy (fNIRS) is a completely non-destructive in vivo optical detection technology developed in recent years. Biological tissue has the characteristics of low absorption and high scattering for light in the near-infrared band. Near-infrared light can penetrate biological tissue with a thickness of several centimeters to detect deep biological tissue. When the oxygen metabolism rate increases when the brain is activated, cerebral blood flow also increases, causing oxyhemoglobin (HbO 2 ) and reduced hemoglobin (Hb) concentrations. HbO 2 The absorption spectra of Hb and Hb in the near-infrared band are specific. Therefore, near-infrared spectroscopy can indirectly detect brain neural activity according to chang...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/01
CPCG06F3/015G06F2203/011
Inventor 骆清铭龚辉李颖李鹏程
Owner HUAZHONG UNIV OF SCI & TECH
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