Effects of risk experience on choice behavior in rats under concurrent chained schedule

并发链式日程下风险体验对大鼠选择行为的影响

基本信息

批准号：
06610086
负责人：
SAKAGAMI Takayuki
金额：
$ 1.28万
依托单位：
Keio University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06610086/
关键词：
Uncertainty Choice behavior Concurrent chained schedule Repeated gamble Risk Rat 並立連鎖強化スケジュール

项目摘要

Six male Wister rats, placed in the two-leveroperant boxes, were exposed under the concerrernt chained schedule. After competion of the initial link schedule (FR1), rats chose between two alternatives which were followed by two different consequences. Then they worked on the terminal link schedule (FR25) on the chosen alternative. If the sebjects chose the risk alternative, ten pellets or the black-out (BO) lasting ten seconds were presented with probility (p) 0.5. If the subjects selected the riskless alternative, five pellets with p=0.9 or BO (five seconds) with P=0.1 were occurred. Two rats experienced ten pellets (p=0.1) /BO (p=0.9) in the risk alternative and one pellet (p=0.9) /BO (p=0.1) in the riskless alternative. One session consisted of the forced choice trials in which subjects should select a pre-determined alternative and the free choice traials in which subjects could select one of two alternatives. In this non-separate condition, three of four rats whose pellet presentation probabilities (PPP) in risk vs.riskless alternative were 0.5 vs.0.9 showed risk aversion, but one rat showed risk prone. Two rats with PPP 0.1 vs.0.9 showed risk aversion. All rats showed very stable choices when FR ratios in the terminal link were increased and the forced choice trials changed to a Stubbs & Pliskoff type using two discriminative stimuli in the initial iink. In the separate condition, presentation of the consequence in the terminakl link was separated into five small consequences, e.g.a single presentation of ten-pellets separated into five multiple presentations of two-pellets. All five rats which showed risk averse in the non-separate condition produced unstable choice patterns the in separate condition.

将六只雄性猎病人大鼠放在两玻璃盒中，在固定的时间表下暴露在束缚的盒子中。在最初的链接时间表（FR1）竞争之后，大鼠选择了两种替代方案，随后是两个不同的后果。然后，他们在选定的替代方案上按照终端链接时间表（FR25）工作。如果Sebjects选择了风险替代方案，则持续十秒钟的10颗颗粒或涂黑（bo）的可能性（p）0.5。如果受试者选择了无风险的替代方案，则会发生五个具有p = 0.9或bo（五秒）的颗粒，p = 0.1。两只大鼠在风险替代方案中经历了十颗颗粒（p = 0.1） /bo（p = 0.9），而无风险的替代方案中有1个颗粒（p = 0.9） /bo（p = 0.1）。一个会话由强制选择试验组成，在该试验中，受试者应选择预定的替代方案和自由选择创伤，其中受试者可以选择两种替代方案之一。在这种非分离状态下，四只大鼠的颗粒表现概率（PPP）中有三只风险与无风味的替代方案为0.5 vs.0.9，显示出风险的厌恶，但一只大鼠表现出容易发生的风险。 PPP 0.1 vs.0.9的两只大鼠表现出避免风险。当终端连接中的FR比率增加并且强制选择试验中使用两种歧视性刺激时，所有大鼠均显示出非常稳定的选择。在单独的条件下，将末端连接中后果的表示形式分为五个小后果，例如，单个呈现的十个细胞的单一呈现分为五个两层的多个呈现。在非分离状态下显示出风险的所有五只大鼠都会在不同条件下产生不稳定的选择模式。