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

Research Project

Project/Area Number 06610086
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 実験系心理学
Research InstitutionKeio University

Principal Investigator

SAKAGAMI Takayuki  Keio University, Faculty of Letters, Associate Professor, 文学部, 助教授 (90146720)

Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1995: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1994: ¥1,700,000 (Direct Cost: ¥1,700,000)
KeywordsUncertainty / Choice behavior / Concurrent chained schedule / Repeated gamble / Risk / Rat / 並立連鎖強化スケジュール
Research Abstract

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.

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (4 results)

All Other

All Publications (4 results)

  • [Publications] 坂上貴之: "不確実性をめぐる動物行動研究" 心理学評論. 37. 294-319 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Sakagami, T.: "Animal behavioral studies under uncertainty." Japanese Psychological Review. 37. 294-319

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 坂上貴之: "不確実性をめぐる動物行動研究" 心理学評論. 37. 294-323 (1994)

    • Related Report
      1995 Annual Research Report
  • [Publications] 坂上貴之: "不確実性をめぐる動物行動研究" 心理学評論. 37. (1994)

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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