Lydersen T
Fircrest School, Seattle, Washington USA.
Behav Processes. 1992 Dec;28(1-2):1-12. doi: 10.1016/0376-6357(92)90044-E.
Three rats pressed a lever for food on differential-reinforcement-of-low-rate (DRL) schedules ranging from 16 s to 96 s. During DRL performance, a response to a second lever turned off chamber illumination and produced a timeout period during which food could not be obtained. During timeout periods, a response to the second lever reinstated the DRL schedule and associated chamber illumination. The percentage of session time spent in timeout periods increased as the DRL schedule was lengthened and decreased when the schedule was shortened. Changes in timeout percentage were primarily due to changes in the mean time per timeout rather than to changes in the rate of initiation of timeout periods. Extinction increased the timeout percentage. Elimination of the timeout contingency decreased the response rate to the timeout lever, but did not systematically affect DRL lever pressing. The rate of reinforcement appeared to be a primary determinant of the percent of session time spent in timeout periods.
三只大鼠在16秒至96秒的低速率差异强化（DRL）时间表上按压杠杆获取食物。在DRL任务执行期间，对第二个杠杆的反应会关闭实验箱照明并产生一个超时时段，在此期间无法获得食物。在超时时段内，对第二个杠杆的反应会恢复DRL时间表并恢复相关的实验箱照明。随着DRL时间表延长，超时时段所占用的会话时间百分比增加，而当时间表缩短时则减少。超时百分比的变化主要是由于每次超时的平均时间变化，而不是由于超时时段开始率的变化。消退增加了超时百分比。消除超时意外情况降低了对超时杠杆的反应率，但并未系统地影响DRL杠杆按压。强化率似乎是超时时段所占用会话时间百分比的主要决定因素。
