Espmark Y, Langvatn R
Department of Zoology, University of Trondheim, Norway; Norwegian State Game Research Institute, Trondheim, Norway.
Behav Processes. 1979 Jul;4(2):179-86. doi: 10.1016/0376-6357(79)90032-9.
Radio transmitters were used to record the ECG signals of young red deer calves (Cervus elaphus) when they were exposed to various stimuli which elicited the immobility or "freezing" response. When the calves were exposed to stimuli likely to occur in the deer's natural habitat, the heart rate decreased by 25 to 85% of the pre-exposure rate. The calves displayed a more pronounced bradycardia during their first days of life than at a later age. There are also indications that repeated exposure to the same stimulus will cause a gradual waning both of the bradycardia and of the behavioural response.
当幼小的马鹿（ Cervus elaphus）暴露于各种引发不动或“僵住”反应的刺激时，使用无线电发射器记录它们的心电图信号。当幼鹿暴露于鹿自然栖息地可能出现的刺激时，心率会下降到暴露前心率的25%至85%。幼鹿在出生后的头几天比在稍大一些的时候表现出更明显的心动过缓。也有迹象表明，反复暴露于相同的刺激会导致心动过缓和行为反应逐渐减弱。
