Stimulus compounding in interval timing: the modality-duration relationship of the anchor durations results in qualitatively different response patterns to the compound cue.
Stimulus compounding in interval timing: the modality-duration relationship of the anchor durations results in qualitatively different response patterns to the compound cue.
复制标题
间隔计时中的刺激复合：锚定持续时间的模态-持续时间关系导致对复合线索的反应模式在性质上不同。
DOI：
10.1037/a0020200
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Matell,MatthewS
中科院分区：
文献类型：
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作者：
Swanton,DaleN;Matell,MatthewS
我们以前已经证明，大鼠训练的两个持续时间的峰值程序，其中两个模态信号（即，音和houselight）预测概率强化的可用性在两个时间（10秒和20秒）将在一个标量的方式在训练的持续时间之间的时间响应于同时的复合提示（音+ houselight）。在这些实验中，我们评估了这种标量响应模式是否会在锚持续时间之间保持更大的相对分离。结果显示的模态-持续时间的关系，这样的标量响应被认为是在复合试验中训练的大鼠，听觉刺激信号的持续时间较短，而视觉刺激信号的持续时间较长，但不是在相反的条件。在对化合物试验显示标量反应的大鼠中，事后分析表明，化合物反应的峰值时间最准确地预测了锚峰值时间的强化概率加权平均值。相比之下，大鼠训练的视觉刺激信号的持续时间较短，而听觉刺激信号的持续时间较长，在一个高度倾斜的方式作出反应。在这些大鼠中，开始响应复合刺激似乎是由视觉刺激控制，而反应终止反映了两个模态刺激的控制。后者的数据提供了反应启动和终止的不同决定因素的证据。
We have previously demonstrated that rats trained on a two-duration peak procedure in which two modal signals (ie, tone and houselight) predicted probabilistic reinforcement availability at two times (10 s and 20 s) would respond in a scalar manner at a time between the trained durations in response to the simultaneous compound cue (tone+ houselight). In these experiments, we evaluated whether this scalar response pattern would remain with greater relative separation between the anchor durations. Results revealed an effect of the modality–duration relationship, such that scalar responding was seen on compound trials in rats trained that the auditory stimulus signaled the shorter duration, whereas the visual stimulus signaled the longer duration, but not in the reverse condition. In rats showing scalar responding on compound trials, post hoc analyses demonstrated that the peak time of compound responding was most accurately predicted by the reinforcement probability weighted average of anchor peak times. In contrast, rats trained that the visual stimulus signaled the shorter duration, whereas the auditory stimulus signaled the longer duration, responded in a highly rightward skewed manner. In these rats, initiation of responding to the compound stimulus appeared to be controlled by the visual stimulus only, whereas response terminations reflected control by both modal stimuli. These latter data provide evidence of separate determinants of response initiation and termination.