Reed Phil, Hildebrandt Tom, DeJongh Julie, Soh Mariane
Department of Psychology, University College London, United Kingdom.
J Exp Anal Behav. 2003 Mar;79(2):157-73. doi: 10.1901/jeab.2003.79-157.
Three experiments investigated whether rats are sensitive to the molar properties of a variable-interval (VI) schedule with a positive relation between response rate and reinforcement rate (i.e., a VI+ schedule). In Experiment 1, rats responded faster on a variable ratio (VR) schedule than on a VI+ schedule with an equivalent feedback function. Reinforced interresponse times (IRTs) were shorter on the VR as compared to the VI+ schedule. In Experiments 2 and 3, there was no systematic difference in response rates maintained by a VI+ schedule and a VI schedule yoked in terms of reinforcement rate. This was found both when the yoking procedure was between-subject (Experiment 2) and within-subject (Experiment 3). Mean reinforced IRTs were similar on both the VI+ and yoked VI schedules, but these values were more variable on the VI+ schedule. These results provided no evidence that rats are sensitive to the feedback function relating response rate to reinforcement rate on a VI+ schedule.
三项实验研究了大鼠是否对可变间隔（VI）强化程序的总量特性敏感，该程序中反应率与强化率呈正相关（即VI+程序）。在实验1中，大鼠在可变比率（VR）程序上的反应速度比在具有等效反馈功能的VI+程序上更快。与VI+程序相比，VR程序上的强化反应间隔时间（IRT）更短。在实验2和实验3中，VI+程序和按强化率匹配的VI程序所维持的反应率没有系统差异。这一结果在被试间匹配程序（实验2）和被试内匹配程序（实验3）中均被发现。VI+程序和匹配的VI程序上的平均强化IRT相似，但VI+程序上的这些值更具变异性。这些结果没有提供证据表明大鼠对VI+程序中反应率与强化率之间的反馈功能敏感。
