J Exp Anal Behav. 1972 Jul;18(1):147-53. doi: 10.1901/jeab.1972.18-147.
High-speed photography was used to compare the pigeon's response to unsignalled shock with the pigeon's key-peck response. During shock, pigeons flex their neck (i.e., the distance between their eyes and shoulders decreases). Following shock, the neck is extended. During key pecking, the neck remains extended and the head moves toward the key in a slight arc as though attached to a fixed fulcrum. Response topography during pecking and shock appear to be incompatible, and it is concluded that the difficulty in key-peck training pigeons to escape electric shock is due to interference from the unconditioned flexion response. This conclusion supports the species-specific defense theory of escape and avoidance behavior.
高速摄影被用来比较鸽子对未标记的电击的反应和鸽子的啄键反应。在电击过程中,鸽子会弯曲颈部(即眼睛和肩膀之间的距离减小)。电击后,颈部伸展。在啄键时,颈部保持伸展,头部向键稍微弧形移动,就好像连接到一个固定的支点上一样。啄键和电击时的反应形态似乎不兼容,因此可以得出结论,在啄键训练鸽子逃避电击时的困难是由于未条件反射的弯曲反应的干扰。这个结论支持了逃避和回避行为的物种特异性防御理论。