Killeen P R, Cate H, Tran T
Psychology Department Arizona State University, Tempe 85287-1104.
J Exp Anal Behav. 1993 Jul;60(1):203-17. doi: 10.1901/jeab.1993.60-203.
Preferences of hungry pigeons among 10 grains and pellets were analyzed using a Thurstone scaling procedure. The recovered scales were positively correlated with size of the feed. The correlations improved when the Thurstonian assumption of equal-sized discriminal dispersions (Case V) was replaced with the assumption of proportional-sized dispersions (Case VI), as entailed by Weber's law. The correlations weakened when the experiments were conducted with the pigeons close to their free-feeding weights, where the probability of sampling alternative grains increased. In the final experiment, exposure to a large pellet shifted the preferences between two smaller pellets.
利用瑟斯顿量表法分析了饥饿鸽子对10种谷物和颗粒饲料的偏好。得到的量表与饲料大小呈正相关。当用韦伯定律所要求的比例大小离散假设(情况VI)取代等大小辨别离散的瑟斯顿假设(情况V)时,相关性有所提高。当在鸽子接近自由采食体重的情况下进行实验时,相关性减弱,此时采食替代谷物的概率增加。在最后一个实验中,接触大颗粒饲料改变了两只较小颗粒饲料之间的偏好。