作者: Stephen B. Kendall
DOI: 10.3758/BF03343136
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摘要: Two pigeons were trained on an observing response procedure where a peck to the key produced either stimulus correlated with FR1O or FR50. When output had become stable this schedule, lower of two FRs was raised 20 and then 30. The larger remained at 50. Both Ss ceased making when FR set