Brain-computer interface control system and method based on language imagination

Abstract

The invention discloses a brain-computer interface control system and method based on language imagination. The system comprises an electroencephalogram collection device, a language imagination experiment module, an electroencephalogram signal feature extraction and classification module and an online control module. The electroencephalogram collection device collects EEG electroencephalogram signals when a testee carries out language imagination, the language imagination experiment module provides visual and auditory prompts of different words and guides the testee to carry out language imagination, and the feature extraction and classification module carries out signal reconstruction by applying an EMD method and carries out feature extraction by applying a DWT method. Feature classification is carried out by adopting an SVM method, and the online control system is communicated with external equipment through a TCP / IP (Transmission Control Protocol / Internet Protocol). According to the system and method, electroencephalogram features are classified through language imagination, compared with visual or auditory stimulation, more convenience can be brought to the testee, compared with motor imagination, more classification can be achieved, the performance of a brain-computer interface is improved, and high-precision and stable multi-classification of the language imagination of a user is achieved.

Description

technical field [0001] The invention relates to the technical field of brain-computer interface. In particular, it relates to a brain-computer interface online control system based on language imagination. Background technique [0002] The brain-computer interface is a communication system that does not depend on the normal output pathways of the peripheral nerves and muscles of the brain. It directly connects the brain of a human or animal with an external device, and realizes communication with external devices by collecting and processing brain activity signals. control. The emergence of brain-computer interface technology has brought great convenience to patients who cannot interact with speech or body movements (such as voice control, button control, etc.). Patients can control the screen cursor, mechanical prosthesis and Control of wheelchairs, etc. [0003] In BCI technology, the brain-computer interface of imagined speech has important practical value, which is di...

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Problems solved by technology

The method classifies emotions and can be used to detect mental states, but cannot be externally controlled

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