Brain-computer interface method and system based on real-time closed loop vibration stimulation enhancement

A brain-computer interface system based on real-time closed loop vibration stimulation enhancement, comprising:

• a human-computer interaction module, configured to display and provide a motor imagery task to a subject;
• an electroencephalogram signal collection module, configured to collect a digital electroencephalogram signal generated during motor imagery of the subject;
• a real-time phase prediction module, configured to read the collected digital electroencephalogram signal, judge whether the preset time period is exceeded or not, intercept the digital electroencephalogram signal in the preset time period if YES, and continuously read the collected digital electroencephalogram signal if NO;
• and configured to obtain time-frequency characteristics of the digital electroencephalogram signal of the period through calculation by fast Fourier transform after performing band-pass filtering on the intercepted digital electroencephalogram signal in the preset time period, extract a frequency value with highest frequency energy in the time-frequency characteristics as its main frequency, obtain an instantaneous phase of the digital electroencephalogram signal of the period through calculation by Hilbert transform, generate predicted sine waves by respectively using the main frequency and the instantaneous phase of the digital electroencephalogram signal of the period as a frequency and an initial phase of sine waves, and predict and obtain real-time phase information at the current moment according to the predicted sine waves;
• and
• a controller that is configured to function as:
• an electroencephalogram signal analysis module, configured to judge whether the real-time phase is in a vibration stimulation application phase interval or not according to the predicted and obtained real-time phase information at the current moment, and generate and output a control instruction according to the judging result;
• and
• a vibration stimulation feedback module, configured to control a vibration motor to vibrate and to stimulate a sensory channel of the subject according to the control instruction output by the electroencephalogram signal analysis module.