Fantino E, Royalty P
J Exp Anal Behav. 1987 Jul;48(1):145-59. doi: 10.1901/jeab.1987.48-145.
Six pigeons responded on concurrent-chains schedules with either independent or interdependent equal variable-interval schedules in the initial links and unequal variable-interval schedules, always in a 2:1 ratio, in the terminal links. Relative response rates in the initial links increased across conditions as initial-link duration was shortened and decreased across conditions as terminal-link duration was shortened, replicating previous findings. Responses in the initial links were recorded in 5-s bins, and local or molecular relative response rates were calculated in order to ascertain how relative response rate varied as a function of time since the onset of the initial links. Two distinct molecular patterns were found. With interdependent initial links, relative response rates for the preferred key were elevated for the first 10 or 20 s of the initial links and then declined to an asymptotic value. With independent initial links, a negative recency effect was found similar to that reported by Killeen (1970). These two molecular patterns were related to the different momentary reinforcement probabilities resulting from independent and interdependent scheduling.
六只鸽子在并发链程序中做出反应，初始链中采用独立或相互依存的等变时程程序，终端链中采用不等变时程程序，且二者比例始终为2:1。随着初始链持续时间缩短，初始链中的相对反应率在不同条件下增加；随着终端链持续时间缩短，初始链中的相对反应率在不同条件下降低，这重复了先前的研究结果。初始链中的反应以5秒为间隔进行记录，并计算局部或分子相对反应率，以确定相对反应率如何随初始链开始后的时间变化。发现了两种不同的分子模式。在相互依存的初始链中，偏好键的相对反应率在初始链的前10秒或20秒升高，然后下降至渐近值。在独立的初始链中，发现了与基林（1970年）报告的类似的负近因效应。这两种分子模式与独立和相互依存的调度所产生的不同瞬间强化概率有关。
