Branch M N, Gollub L R
J Exp Anal Behav. 1974 May;21(3):519-39. doi: 10.1901/jeab.1974.21-519.
Pigeons were exposed to fixed-interval schedules of food reinforcement with durations of 300 sec, 100 sec, or 40 sec. A range of doses of d-amphetamine was administered to each pigeon, and the resulting behavior was analyzed at several levels of detail. Average rates in different portions of the intervals predicted the magnitude of the drug's effect, but a finer analysis showed that average rates did not adequately characterize the behavior in some parts of the intervals. The probability of responding in different parts of an interval without drug was also a good predictor of the magnitude of the effect of d-amphetamine, and at the same time was more descriptive of the interval-to-interval performance. Analyses of the control performance indicated that responding in individual intervals could be described as consisting of two parts: a very low, or zero, rate at the beginning of the interval followed by an abrupt transition to a slightly, but reliably, positively accelerated rate maintained until reinforcement.
鸽子被置于时长为300秒、100秒或40秒的固定间隔食物强化时间表下。给每只鸽子施用一系列剂量的右旋苯丙胺,并对由此产生的行为进行了多个层面的详细分析。间隔不同部分的平均反应率预测了药物效应的大小,但更精细的分析表明,平均反应率并不能充分描述间隔某些部分的行为。在无药物情况下间隔不同部分的反应概率也是右旋苯丙胺效应大小的良好预测指标,同时更能描述间隔间的表现。对照表现的分析表明,单个间隔内的反应可描述为由两部分组成:间隔开始时极低或为零的反应率,随后突然转变为轻微但可靠的正加速反应率,并持续到强化。