Combined brain-computer interface method and device based on SSVEP (Steady-State Visually Evoked Potentials) and P300

A brain-computer interface and lead technology, applied in the field of medical devices, to achieve considerable social and economic benefits

Active Publication Date: 2013-11-20
TIANJIN MEDICAL UNIV
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Problems solved by technology

In this patent, one target is flickered by one frequency control, and N targets need to be controlled by N frequencies. However, when using an ordinary

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  • Combined brain-computer interface method and device based on SSVEP (Steady-State Visually Evoked Potentials) and P300
  • Combined brain-computer interface method and device based on SSVEP (Steady-State Visually Evoked Potentials) and P300
  • Combined brain-computer interface method and device based on SSVEP (Steady-State Visually Evoked Potentials) and P300

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Embodiment Construction

[0026] The specific EEG signal is induced by a specific BCI paradigm. In this invention, a joint brain-computer interface paradigm based on SSVEP and P300 is proposed to achieve multiple targets with less frequency, and achieve multiple target stimulation through feature combination, shortening the period of visual stimulation. Time, and effectively combined with P300 to achieve the purpose of target recognition, to achieve the communication between the human brain and the outside world.

[0027]The present invention is characterized in that, in the combined brain-computer interface paradigm, when a person looks at a certain character, the column frequency modulation flicker will induce an EEG signal of the same frequency or multiple frequencies in the human brain signal, which is called SSVEP; Random frame enhancement (HBF) induces P300 in the human brain. Through the analysis and detection of human brain electrical signals, the information of the row-column where the target ...

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Abstract

The invention relates to the technical field of medical instruments, and aims to provide a novel combined brain-computer interface normal form, which solves the technical difficult problem that two kinds of brain electrical signals are simultaneously evoked, separates the brain electrical signals in space and frequency domain and analyzes the signal features of the SSVEP and P300 so as to achieve the purpose of target identification. In order to achieve the purpose, the technical scheme adopted by the invention is that a combined brain-computer interface method based on the SSVEP and the P300 comprises the following steps: the SSVEP is evoked through line fixed frequency blinking, and the P300 is evoked through row color-frame highlighting; certain pre-processing is performed on the collected brain electrical signals, namely the SSVEP and P300; the lines in which the target characters are positioned are identified through analyzing the frequency features of the collected brain electrical signal SSVEP; the features of the P300 of the brain electrical signals are analyzed, the rows in which the target characters are positioned are identified. The combined brain-computer interface method and the combined brain-computer interface device are mainly applied to the brain-computer interface.

Description

technical field [0001] The present invention relates to the field of medical devices, in particular to a brain-computer interface method and device based on SSVEP and P300 combined in the field of medical devices. technical background [0002] Brain-computer interface (Brain-computer interface, hereinafter referred to as BCI), is a kind of human-computer interface developed in recent years. A system that communicates directly with the outside world (computer or other external device). The advent of BCIs provides patients with ALS and other neuromuscular diseases with a means of communicating that does not depend on conventional output pathways. By building an independent channel between the brain and external devices, the purpose of information transmission and interaction is achieved. [0003] Event-related potentials are a series of electrical activities induced by the brain to process information about certain events. P300 is a kind of event-related potentials (Event-re...

Claims

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Application Information

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IPC IPC(8): G06F3/01A61B5/0484
Inventor 匡光涛王索刚郑旭媛张娟丁佳
Owner TIANJIN MEDICAL UNIV
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