Research On The Effect Of Temperature Stimulation On Brain Vigilance

Vigilance refers to the ability of a person to process and maintain repetitive,non-arousal stimuli consciously for a long time when performing tasks,including concentration of attention,rapid response to emergencies,and the arousal degree of brain.In many fields of daily life and work,such as car driving,aerospace,medical diagnosis,military operations,etc,operators need to be able to maintain a high level of vigilance for a long time.Once the level of vigilance is decreased and not processed in time,it is likely to lead to the failure of the mission and even cause serious accidents such as casualties and property damage.Therefore,how to regulate brain vigilance quickly and effectively in short time has become a hot research topic for researchers at home and abroad.It is of great significance and practical value to explore a method that can regulate brain vigilance quickly and effectively and is painless,non-invasive,safe and easy to operate.Based on mentioned above,this study proposes a method based on temperature stimulation to regulate brain vigilance.Firstly,the Psychomotor Vigilance Test(PVT)task was designed to construct the brain vigilance decrement model,and then a forehead temperature stimulation was used to regulate the decrement of the subjects' brain vigilance while recording subjects' behavioral(reaction time)and physiology(electroencephalogram)data,and self-reported scales were completed before and after the experiment.Finally,the scores of self-reported scales,characteristics of behavioral and electroencephalogram(EEG)signals were analyzed to explore the feasibility and neural mechanisms of regulating brain vigilance by temperature stimulation.In the modeling section,the scores of self-reported scales and the results of behavioral analysis showed that the scores of self-reported scales after the experiment were significantly higher than that before the experiment,and the average response time of the PVT task was significantly larger than the initial state,indicating that the PVT task constructed the brain vigilance decrement model successfully.In the regulation section,after applying temperature stimulation,the results of behavioral analysis showed that the average response time of the PVT task decreased significantly.The results of EEG signals analysis showed that,in the frequency domain,the average power,the relative power of the theta band,and the power ratios of the low bands and high bands decreased,and the relative powers of the alpha band and the beta band increased,where the power ratio of the alpha band and beta band decreased significantly,and the relative power of the alpha band increased significantly;In the event-related spectral perturbation of time-frequency domain,the energy of the theta band,the low alpha band and the low beta band of the frontal and occipital regions decreased significantly,and the energy of the high beta band of the frontal region increased significantly;In the Lempel-Ziv complexity of nonlinear features,the rate of generating new modes of EEG signals was faster and the complexity increased;In brain network,the average node degree,the global efficiency,and the average clustering coefficient increased,and the average shortest path length decreased.The core region of brain activity was transferred from the occipital region to the prefrontal region.The connectivity of the brain network enhanced,and the efficiency of information transmission improved.The above results preliminarily shows that temperature stimulation has certain effects and feasibility on regulating brain vigilance,which provides theoretical and experimental basis for the application of temperature stimulation in the regulation of brain vigilance.