Higa Jennifer J., Moreno Sara, Sparkman Nathan
Department of Psychology, Texas Christian University, P.O. Box 298920, 76129, Fort Worth, TX, USA
Behav Processes. 2002 Jun 28;58(3):167-176. doi: 10.1016/s0376-6357(02)00029-3.
The present experiment examined interval timing in rats under dynamic conditions. A session began with FI60 s intervals, changed to a FI20 s, FI30 s, or FI40 s schedule at an unpredictable point, and then returned to a FI60 s schedule after the rats received 1, 8, or 24 successive short FI intervals. Variations in the duration and number of shorter intervals occurred across sessions and conditions. We observed rapid control of wait time duration by the FI duration of the preceding interval (one-back tracking), and changes in wait time depended on the number and duration of the shorter intervals. Furthermore, we observed proportional and scalar timing effects in overall wait time duration. The results provide information about the relation between interval timing under dynamic and steady state conditions.
本实验研究了动态条件下大鼠的间隔计时。实验阶段开始时采用60秒固定间隔强化程序，在一个不可预测的时间点改为20秒、30秒或40秒的固定间隔强化程序，然后在大鼠连续接受1次、8次或24次短固定间隔强化后再恢复为60秒的固定间隔强化程序。在不同的实验阶段和条件下，较短间隔的持续时间和数量会有所变化。我们观察到前一个间隔的固定间隔强化持续时间能快速控制等待时间（一步回溯追踪），且等待时间的变化取决于较短间隔的数量和持续时间。此外，我们在总体等待时间上观察到了比例和标量计时效应。这些结果提供了有关动态和稳态条件下间隔计时之间关系的信息。
