RISKY CHOICE AS A FUNCTION OF AMOUNT AND VARIANCE IN FOOD-SUPPLY
RISKY CHOICE AS A FUNCTION OF AMOUNT AND VARIANCE IN FOOD-SUPPLY
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DOI：
10.1901/jeab.1990.53-155
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发表时间：
1990-01-01
影响因子：
2.7
通讯作者：
HURSH, SR
中科院分区：
文献类型：
--
作者：
HASTJARJO, T;SILBERBERG, A;HURSH, SR
在实验1中，4只大鼠通过在试验的基础上在“风险”和“无风险”杠杆之间进行选择来获得每日的食物配给。风险杠杆产生15个45毫克的食物颗粒或没有颗粒，平均每个选择提供5个颗粒。无风险的杠杆总是产生三个弹丸。在不同条件下，每次试验的次数各不相同。体重和风险杠杆的选择减少，每次会议的试验次数减少，即使体重只能通过增加风险杠杆的选择来捍卫。在实验2中，每个阶段的试验次数是固定的，但风险和无风险杠杆释放的颗粒数量要么与实验1相同，要么是实验1的三倍。现在，风险杠杆的选择与加固物的大小和体重呈负相关。这些实验的结果表明，风险规避协变与在一个会话中可获得的食物量和每天的食物量的变化。
In Experiment 1, 4 rats earned their daily food ration by choosing on a trials basis between a "risky" and a "riskless" lever. The risky lever produced either 15 45-mg food pellets or no pellets, and on average provided five pellets per choice. The riskless lever always produced three pellets. Across conditions, the number of trials per session was varied. Body weight and choice of the risky lever decreased as the number of trials per session decreased, even though body weight could only be defended by increased choice of the risky lever. In Experiment 2, trials per session were fixed, but the number of pellets delivered by the risky and riskless levers was either at the same level as in Experiment 1 or tripled from those levels. Now choice of the risky lever was inversely related to the size of reinforcement and to body weight. The results of these experiments show that risk aversion covaries with the amount of food available in a session and the daily variance in the amount of food earned.