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

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...

AI Technical Summary

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 display as a stimulus device, due to the limitation of the screen refresh rate, there is a bottleneck limitation in the realization of multiple targets.

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