Trial and intertrial durations in appetitive conditioning in rats
Trial and intertrial durations in appetitive conditioning in rats
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DOI：
10.3758/bf03200248
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发表时间：
2000-05-01
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影响因子：
--
通讯作者：
Holland, PC
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文献类型：
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作者：
Holland, PC
在两个以大鼠为对象的巴甫洛夫条件反射实验中，考察了试验(T)和试验间(I)持续时间的影响，其中噪声条件刺激(CS)与食物递送配对。在实验1中，在不同的大鼠组中，T为10秒或20秒，I为15秒至960秒。条件反应的习得率和最终水平呈现比率不变性：Il-T比率比I或T单独预测它们更好。在实验2中，所有组的I/T比均为6.0，T分别为20、40、80或160秒。未观察到比率不变性：尽管I/T比率相同，但习得率、条件性反应的最终水平以及CS阻断另一刺激的条件反射的能力在不同组之间存在差异。同时，在整个条件化和消退过程中，T内条件性反应的时间分布在所有组中都是相似的，并且在T上归一化时呈现重叠。数据的许多方面(但不是所有方面)都与标量计时理论一致。
The effects of trial (T) and intertrial (I) durations were examined in two Pavlovian conditioning experiments with rats, in which a noise conditioned stimulus (CS) was paired with food delivery. In Experiment 1, T was either 10 or 20 sec, and I ranged from 15 to 960 sec, in separate groups of rats. The acquisition rate and final level of conditioned responding showed ratio invariance: They were better predicted by the Il T ratio than by I or T alone. In Experiment 2, the I/T ratio was 6.0 in all the groups, and T was 20, 40, 80, or 160 sec. Ratio invariance was not observed: Despite the common I/T ratio, the rate of acquisition, final level of conditioned responding, and the ability of the CS to block conditioning of another stimulus differed among the groups. At the same time, the temporal distribution of conditioned responding within T was similar in all the groups throughout conditioning and extinction and showed superpositioning when normalized across T. Many but not all aspects of the data were consistent with scalar timing theory.