J Exp Anal Behav. 1972 May;17(3):369-74. doi: 10.1901/jeab.1972.17-369.
Four pigeons were trained under concurrent variable-interval variable-interval and fixed-interval variable-interval schedules in a two-key situation. Both response allocation and time allocation to the two schedules were measured when various reinforcement rates were arranged on each key. All animals showed an approximately constant proportional preference for the variable-interval schedule over the fixed-interval schedule. These results support Schneider's (1969) analysis of fixed-interval schedule performance.
四只鸽子在双钥匙情境下接受同时的变化时距-变化时距和固定时距-变化时距程序训练。在每把钥匙上安排不同的强化率时,测量了对两个程序的反应分配和时间分配。所有动物对变化时距程序的近似恒定比例偏好都超过了固定时距程序。这些结果支持 Schneider(1969)对固定时距程序表现的分析。