Dr. Lu Zhou Profile

Dr. Lu Zhou

at Nanjing Univ of Aeronautics and Astronautics

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Proceedings Article | 18 July 2023 Paper

Assessment of pilot stress based on functional near-infrared techniques

Lu Zhou, Yixuan Xu, Bing Qin, Qiaoqiao Zhu, Zhiyu Qian

Proceedings Volume 12745, 127450T (2023) https://doi.org/10.1117/12.2683911

KEYWORDS: Education and training, Brain, Oxygen, Data acquisition, Spectroscopy, Blood, Statistical analysis, Near infrared

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Excessive stress levels can lead to fluctuations in pilot operating techniques, decreased quality of work, increased errors, impulsive behavior, and communication difficulties, resulting in reduced pilot coping ability to the environment, behavioral disorders, and flight accidents. The purpose of this study is to analyze the cerebral blood oxygen characteristics of pilots before and after stress and the relationship between this characteristic and their antiglare performance by functional near-infrared techniques (fNIRs), and to establish an index for the evaluation of pilots' stress response. A total of 15 pilots were recruited in this study, and the stress of the pilots was induced by spin ladder training, while the cerebral blood oxygen of the pilots was collected simultaneously by fNIRs. It was found that the difference in HbO₂ between the left and right brain regions was significantly different before and after the stress stimulation caused by spin-ladder training, and the difference in HbO₂ was elevated by 0.072 (p ⪅ 0.05) after the stimulation. In contrast, the difference in Hb decreased by 0.068 (p ⪅ 0.05) after the stimulation. Furthermore, the value of the change in HbO₂ showed a significant negative correlation with the level of anti-vertigo in the subjects: r = -0.925, p ⪅ 0.01. The results of this study can be used to indicate the level of rotational stress in pilots and to predict and assess the anti-glare potential of flight trainees.

Proceedings Article | 18 July 2023 Paper

Study on the effect of sleep modulation by transcutaneous electrical nerve stimulation based on low-high frequency coupling

Yixuan Xu, Lu Zhou, Zhiyu Qian

Proceedings Volume 12745, 127450U (2023) https://doi.org/10.1117/12.2683876

KEYWORDS: Brain, Electroencephalography, Time-frequency analysis, Modulation, Nerve, Nerve stimulation, Frequency response, Modulation frequency

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Sleep problems have become a social problem worldwide. Currently, drug therapies commonly used to treat sleep problems are usually accompanied by addiction and other side effects. Therefore, non-invasive brain stimulation techniques have received a lot of attention due to their non-invasive, target-adjustable and non-addictive advantages. Among these techniques, Transcutaneous Electrical Nerve Stimulation (TENS) has been proved to be effective in neuromodulation and can be used to relieve various types of pain and improve sleep quality. However, the sleep modulation mechanism and evaluation index of TENS are still unclear. In this study, four TENS modes were proposed to stimulate the nerves of the neck by superimposing high and low frequency signals to investigate their effects on assisting sleep. The electroencephalogram (EEG) signals of the subjects were collected before and after stimulation, processed and analyzed. The effect of TENS was evaluated by combined time-frequency domain analysis and Gravity Frequency (GF). The results showed that there was a significant difference in the gravity frequency before and after stimulation (p-values ⪅0.05). The highest increase in delta power was observed after each mode of stimulation. Delta power enhancement was concentrated in the frontal and occipital lobes. Therefore, all four modes may have some facilitation effect on sleep, and the two modes (mode I and mode IV) had the most significant sleep-assisting effect. Meanwhile, this study provides a new idea to determine the TENS stimulation modes and targets and to quantitatively evaluate the TENS effect.

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