Visual acuity automatically recognized unattended event related potential brain-computer interface method

Abstract

The invention relates to a visual acuity automatically recognized unattended event related potential brain-computer interface method. The method comprises the following steps: manufacturing a vision-sighting target stimulus picture and storing the picture in an event related potential processing device; connecting the processing device with a multi-lead electrode cap for detecting an electroencephalogram signal; setting a visual stimulus parameter of the sighting target stimulus picture in the processing device to a user; exerting auditory stimulus on the user while performing vision stimulus on the user; acquiring an original electroencephalogram signal of the vision unattended event related potential of the user in the above mentioned process by use of the multi-lead electrode cap; processing and analyzing the original electroencephalogram signal by use of the processing device to obtain an event related oscillogram educed by different visual acuity sighting target stimulus users; establishing the relevance of the electroencephalogram and the visual acuity according to the oscillogram, and then establishing a visual acuity automatically recognized brain-computer interface. The invention provides a new method for the brain-computer interface for vision information processing and the automatic detection of the visual acuity, and the defect that the subjective coordination of the user is required is overcome.

Description

technical field [0001] The invention relates to the technical field of human-computer interaction, in particular to a non-attentional event-related potential brain-computer interface method for automatic recognition of visual acuity. Background technique [0002] The brain-computer interface (brain computer interface, BCI) system is a communication system that does not require the participation of peripheral nerves and muscles. It aims to establish a channel for direct communication between the human brain and the outside world. The recognized brain instructions or information are transmitted to the controlled external device, and finally the brain directly controls the external device. [0003] Vision has physiological and psychological attributes, and the results reflected by the visual inspection are comprehensive judgments made by the advanced visual center (brain) after complex processing and analysis of the visual stimulus. electric signal. EEG signals are usually ob...

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Problems solved by technology

[0004] In terms of visual BCI, the Chinese patent "Steady-state visually induced brain-computer interface method based on two-frequency stimulation of the left and right visual field" (application number 200910076209.5) adopts the target presentation method of dual-frequency stimulation of the left and right visual field, and the number of stimulation targets that can be achieved is very large. Great improvement, but currently all the EEG signals extracted by visual BCI are generated under the conditions of active participation of the subjects, that is, the current process of detecting the size and recognition of visual targets requires the subjective cooperation of the subjects, and the results produced It is a brain change in the process of active attention processing, but lacks the establishment of the brain's automatic processing of the visual target stimulus sequence and its corresponding visual BCI of non-attentional processing

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