Environmental enrichment decreases responding for visual novelty
Environmental enrichment decreases responding for visual novelty
复制标题
DOI：
10.1016/j.beproc.2006.08.007
复制
发表时间：
2006-11-01
影响因子：
1.3
通讯作者：
Bardo, Michael T.
中科院分区：
文献类型：
--
作者：
Cain, Mary E.;Green, Thomas A.;Bardo, Michael T.
先前的研究表明，与隔离条件（IC）下饲养的大鼠相比，在具有新对象和社会伙伴的丰富条件（EC）下饲养的大鼠自我管理的安非他明较少。然而，目前还不清楚，如果丰富诱导减少兴奋剂自我管理推广到非药物奖励，如新的环境刺激提供的。在目前的研究中，EC，IC，和社会条件（SC）大鼠从21日龄提高到51日龄，然后在两个杠杆操作性条件反射室中进行测试，其中一个杠杆（主动杠杆）的反应导致照明的提示灯。在实验1中，最初评估大鼠的基线响应（无应急），然后引入应急光。EC大鼠对偶发性光刺激的反应低于IC大鼠;然而，EC大鼠也显示出较低的基线反应率。在实验2中，大鼠最初训练杠杆按蔗糖奖励，以减少基线反应的差异。虽然蔗糖预训练降低了组间的基线反应差异，EC大鼠对偶发性光刺激的反应仍然低于IC或SC大鼠。这些结果表明，丰富的环境降低了视觉新奇的激励价值。(c)2006 Elsevier B. V.保留所有权利。
Previous research has demonstrated that rats reared in an enriched condition (EC) with novel objects and social partners self-administer less amphetamine compared to rats raised in an isolated condition (IC). However, it is unclear if the enrichment-induced decrease in stimulant self-administration generalizes to non-drug rewards such as those provided by novel environmental stimuli. In the current study, EC, IC, and social condition (SC) rats were raised from 21 to 51 days of age before being tested in a two-lever operant conditioning chamber in which responding on one lever (active lever) resulted in illumination of a cue light. In Experiment 1, rats were initially assessed for baseline responding (no contingency) and then the contingent light was introduced. EC rats responded less than IC rats for the contingent light stimulus; however, EC rats also displayed a lower rate of baseline responding. In Experiment 2, rats were trained initially to lever press for a sucrose reward to decrease differences in baseline responding. While sucrose pretraining decreased baseline response differences between groups, EC rats still responded less for the contingent light stimulus than IC or SC rats. These results suggest that environmental enrichment decreases the incentive value of visual novelty. (c) 2006 Elsevier B.V. All rights reserved.