Laties V G, Weiss B, Weiss A B
J Exp Anal Behav. 1969 Jan;12(1):43-57. doi: 10.1901/jeab.1969.12-43.
When the lever-pressing behavior of five rats was maintained by a DRL schedule (reinforcement was scheduled only when a specified waiting time between successive responses was exceeded), collateral behavior developed that apparently served a mediating function. In two cases this behavior did not arise until the experimental environment included pieces of wood that the rats started to nibble. When collateral behavior first appeared, it was always accompanied by an increase in responses spaced far enough apart to earn reinforcement. If collateral behavior was prevented, the number of reinforced responses always decreased. Extinction of lever pressing extinguished the collateral behavior. Adding a limited-hold contingency to the schedule did not extinguish collateral behavior. It appears that the rat can better space its responses appropriately when concurrently performing some overt collateral activity. The amount of this activity apparently comes to serve as a discriminative stimulus. To assume the existence of internal events that serve as discriminative stimuli in temporal discriminations is, at least under some circumstances, unnecessary.
当五只大鼠的压杆行为通过 DRL 程序维持时（仅当连续反应之间超过特定等待时间时才安排强化），出现了明显起到中介作用的附带行为。在两个案例中，这种行为直到实验环境中出现大鼠开始啃咬的木块时才出现。当附带行为首次出现时，总是伴随着间隔足够远以获得强化的反应增加。如果阻止附带行为，强化反应的数量总是会减少。压杆行为的消退会使附带行为消退。在程序中添加有限持有条件不会消除附带行为。似乎大鼠在同时进行一些明显的附带活动时能够更好地适当地间隔其反应。这种活动的量显然起到了辨别刺激的作用。至少在某些情况下，假设存在在时间辨别中起辨别刺激作用的内部事件是不必要的。
