Glover Ashley C, Roane Henry S, Kadey Heather J, Grow Laura L
Marcus Institute, Georgia State University, Georgia, USA.
J Appl Behav Anal. 2008 Summer;41(2):163-76. doi: 10.1901/jaba.2008.41-163.
Progressive-ratio (PR) schedules were used to identify the break point (i.e., the last schedule value completed) for 2 reinforcers under single and concurrent schedules. After the respective break points were established, the same reinforcers were presented under concurrent fixed-ratio (FR) schedules that were yoked to the break points obtained with the PR schedules. Results suggested that the participants responded more for the high-preference item than for the low-preference item, regardless of the presentation arrangement (single or concurrent presentations). This pattern of responding was maintained when the reinforcers were presented under dissimilar FR schedules. The results suggest that responding for differentially preferred stimuli may vary as a function of differences in schedule requirements.
采用累进比率（PR）程序来确定在单一和并发程序下两种强化物的断点（即完成的最后一个程序值）。在确定各自的断点后，在与PR程序获得的断点相匹配的并发固定比率（FR）程序下呈现相同的强化物。结果表明，无论呈现安排（单一或并发呈现）如何，参与者对高偏好项目的反应比对低偏好项目的反应更多。当强化物在不同的FR程序下呈现时，这种反应模式得以维持。结果表明，对不同偏好刺激的反应可能会因程序要求的差异而有所不同。
