**Author details**

Guo-qing Di

exposure in our experiments, the levels of NE in rat plasma increased, indicating that aircraft

Several studies have shown that trait anxiety is significantly associated with increased NE concentration in blood plasma. Individuals with higher plasma NE concentrations also have more severe anxiety symptoms and the concentrations of plasma NE of patients with anxiety disorders are drastically higher than those of healthy individuals [25]. We conclude that highintensity aircraft noise exposure may similarly induce anxiety symptoms in rats. Further, patients with hypertension have also been found to have higher plasma NE concentrations [26]. In addition, epidemiological investigations have pointed out that the incidences of heart disease and hypertension are directly related to aircraft noise exposure [1, 27]. Our results

Previous studies have shown that necrosis and apoptosis of neurons occur when the body is subjected to physical, chemical, or severe pathological stimulation [28]. For this reason, we consider that the long-term noise stress in rats resulted in the lesions in temporal lobe neurons

First line indent lobe areas are closely related to perception and memory [29]. Therefore, when neurons of the temporal lobe are damaged, a variety of mental disorders are likely to occur, such as cognitive decline, memory reduction, or subjective emotional instability [30]. When synaptic morphology changes, the related functions of the brain and CNS change accordingly, further leading to changes in behavior [31]. The results of our experiments are consistent with

In conclusion, exposing rats to long-term aircraft noise affects their behavior, specifically in the form of inhibiting mobility and increasing anxiety. Our data indicate that scrum NE levels of rats increase as a result of aircraft noise exposure. Furthermore, our findings indicate that aircraft noise exposure leads to damage of neuronal and synaptic structures of the temporal lobe in rats. Nevertheless, additional studies are necessary to further investigate the mecha‐

Of course, there are some differences in the hearing sensitivity to different sound frequencies and circadian rhythms between rats and humans, which can bring variances in physiological effects under the same noise exposure. Therefore, it should be further confirmed if these study

noise stimulates sympathetic excitement of the adrenal medulla system.

partly provide pathological evidence supporting this epidemiological research.

changes in rat behavior due to long-term exposure of aircraft noise.

**4.3. Temporal lobe cell morphology**

170 Recent Progress in Some Aircraft Technologies

and synapses of EG-II.

**5. Conclusions**

nisms involved.

results are applied into humans.

Address all correspondence to: dgq@zju.edu.cn

College of Environment & Resource Sciences, Zhejiang University, Hangzhou, China
