Study On Removal Of Eye Artifacts And EEG Characteristics Of Light Induced Non-visual Biological Effects

Light,which causes visual effects,can affect non-visual biological effects.The non-visual biological effect of light have important effects on the biological rhythm and hormone secretion of human body.In general,researchers analyzed non-visual biological effects by various human physiological indicators,subjective scales or formula models.However,these research methods do not specifically reflect the effects of light induced non-visual biological effects on brain function.EEG can reflect the activity state of the brain objectively.Therefore,it is an objective and effective research method to summarize the brain characteristics of light induced non-visual biological effects through the acquisition and analysis of EEG signals.The purpose of this paper is to explore the characteristics of EEG signals in the state of light induced non-visual biological effects.To provide guidance for exploring the effects of non-visual biological effects on human health.Aiming at some problems in the collection and processing of EEG signals in light induced non-visual biological effects,the following work is done in this paper:1)Based on the summary of light induced non-visual effects,this paper designs a EEG acquisition scheme of light-induced non visual biological effects.A total of 21 healthy subjects were recruited using 40 Hz blue light as a source of light stimulation,and multi-channel EEG data before and after light induced non-visual biological effects were collected.2)A new method of removing the ocular artifacts based on the combination of multiple empirical mode decomposition and independent component analysis is proposed.According to the problems in the method of removing the ocular artifacts and the characteristics of EEG acquisition equipment in our laboratory.A hybrid EEG data is generated by simulation,and the algorithm is compared with two other main algorithms by simulation.It is found that the algorithm proposed in this paper is superior to the other two mainstream algorithms in time domain graph results,correlation coefficient and relative error,and the correlation coefficient can reach 0.951.3)EEG power spectrum,sample entropy and brain network analysis methods were used to compare and analyze the EEG data which is collected before and after light induced nonvisual biological effect.The experimental results showed that the light induced non-visual biological effect the energy ratio of ? and ? rhythms of EEG is reduced and the energy ratio of ? and ? rhythms is expanded.And the sample entropy complexity of each channel of EEG is obviously increased.The coherence of electroencephalogram signals between each channel changed obviously,and the clustering coefficient,global efficiency and local efficiency have been improved,while the length of the feature path has been reduced.These results indicate that light induced non-visual biological effects can have an impact on brain activity and the alertness of the brain is improved.Blue light stimulation at a frequency of 40 Hz can not only form a rhythm synchronization effect,but also affect other rhythms.This research provides practical guidance for establishing more accurate and comprehensive evaluation criteria for non-visual biological effects,and then can apply the relevant characteristics of non-visual biological effects to human's daily life and regulate our physiological and psychological activities.