BEHAVIORAL VARIABILITY IN SHR AND WKY RATS AS A FUNCTION OF REARING ENVIRONMENT AND REINFORCEMENT CONTINGENCY
作者:
M. H. L. Hunziker,
R. Lisa Saldana,
Allen Neuringer,
期刊:
Journal of the Experimental Analysis of Behavior
(WILEY Available online 1996)
卷期:
Volume 65,
issue 1
页码: 129-144
ISSN:0022-5002
年代: 1996
DOI:10.1901/jeab.1996.65-129
出版商: Blackwell Publishing Ltd
关键词: behavioral variability;response sequences;attention deficit hyperactivity disorder;body weight;response rate;environmental enrichment;deprivation;spontaneously hypertensive rats
数据来源: WILEY
摘要:
The spontaneously hypertensive rat (SHR) may model aspects of human attention deficit hyperactivity disorder (ADHD). For example, just as responses by children with ADHD tend to be variable, so too SHRs often respond more variably than do Wistar‐Kyoto (WKY) control rats. The present study asked whether behavioral variability in the SHR strain is influenced by rearing environment, a question related to hypotheses concerning the etiology of human ADHD. Some rats from each strain were reared in an enriched environment (housed socially), and others were reared in an impoverished environment (housed in isolation). Four groups—enriched SHR, impoverished SHR, enriched WKY, and impoverished WKY—were studied under two reinforcement contingencies, one in which reinforcement was independent of response variability and the other in which reinforcement depended upon high variability. The main finding was that rearing environment did not influence response variability (enriched and impoverished subjects responded similarly throughout). However, rearing environment affected body weight (enriched subjects weighed more than impoverished subjects) and response rate (impoverished subjects generally responded faster than enriched subjects). In addition, SHRs tended to respond variably throughout the experiment, whereas WKYs were more sensitive to the variability contingencies. Thus, behavioral variability was affected by genetic strain and by reinforcement contingency but not by the environment in which the subjects were r
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