Cannon C B, McSweeney F K
Department of Psychology: Experimental, Box 90086, Duke University, Durham, NC 27708-0086, USA; Washington State University, Pullman, WA, USA.
Washington State University, Pullman, WA, USA.
Behav Processes. 1998 May;43(2):153-62. doi: 10.1016/s0376-6357(98)00009-6.
Rats pressed levers for sweetened condensed milk reinforcers delivered according to a multiple variable-interval 1-min, variable-interval 1-min schedule during 60-min baseline sessions. The obtained pattern of responding was an early-session increase in responding followed by a relatively constant rate of responding during the remainder of the session. In the experimental conditions of experiment 1, sessions were interrupted by a blackout or timeout lasting either 5, 10, or 30 min. Responding following 5- or 10-min interruptions resembled the constant rate of responding late in the baseline sessions. However, responding increased before 30-min interruptions and increased again after the interruption. This change in the pattern of responding was best described as a `restarting' of the within-session pattern of responding. In experiment 2, a 30-min blackout interrupted sessions. However, reinforcers were presented intermittently during the blackout. Responding did not restart following the 30-min blackout-with-reinforcers condition. These results suggest that the mere presentation of reinforcers is sufficient to maintain within-session changes in responding.
在60分钟的基线期实验中，大鼠按压杠杆以获取按多重可变间隔1分钟、可变间隔1分钟的时间表提供的甜炼乳强化物。所获得的反应模式是在实验期开始时反应增加，随后在实验期的剩余时间内反应速率相对恒定。在实验1的实验条件下，实验期被持续5分钟、10分钟或30分钟的停电或超时打断。5分钟或10分钟中断后的反应类似于基线期后期恒定的反应速率。然而，在30分钟中断前反应增加，中断后再次增加。这种反应模式的变化最好描述为实验期内反应模式的“重新开始”。在实验2中，30分钟的停电打断了实验期。然而，在停电期间间歇地呈现强化物。在30分钟停电并伴有强化物的情况下，反应没有重新开始。这些结果表明，仅仅呈现强化物就足以维持实验期内反应的变化。
