Ginsburg H J
Dev Psychobiol. 1975 May;8(3):281-5. doi: 10.1002/dev.420080314.
The manifestation and duration of the tonic immobility reaction in 3-day-old chicks (Gallus gallus) was found to vary reliably as a function of the spatial proximity between the hand of the experimenter and the immobilized chick. The results of this experiment indicate that young birds are susceptible to immobility and that the maintenance of close spatial proximity is the condition necessary for the occurrence of the reaction in young precocial birds.
研究发现，3日龄雏鸡（原鸡）强直性静止反应的表现和持续时间会因实验者的手与被固定雏鸡之间的空间距离而可靠地变化。该实验结果表明，幼鸟易出现静止状态，且保持紧密的空间距离是幼早成鸟出现该反应的必要条件。
