Abstract
Bidirectional genetic selection for good and poor active avoidance learning in a shuttle box has been carried out in three independent laboratories using remarkably similar discrete-trial training procedures. The resulting strains are known as the Roman High and Low Avoidance (RHA and RLA), the Syracuse High and Low Avoidance (SHA and SLA) and the Australian High and Low Avoidance (AHA and ALA) strains, respectively. An additional unidirectionally selected strain, known as the Tokai High Avoider (THA) strain was developed in Japan using a free-operant Sidman avoidance procedure in a Skinner box. This paper reviews the selection of the Syracuse strains, enumerates the various behavioral and endocrine characteristics of the strains, and compares them to the other similarly selected strains. The behavioral work suggests that genetic selection from diverse breeding stocks has resulted in common characteristics that differentiate the strains in the emotional, not learning, domain. The endocrine data, however, are somewhat at odds. The Syracuse strains differentiate one way with respect to endocrine function, and the Roman strains differentiate in the opposite way. We suggest, therefore, that the endocrine correlates are not tightly linked to the avoidance genotype. Genetic analysis of all of the selected strains for both the avoidance phenotype and the endocrine correlates will be needed to test this hypothesis.
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Preparation of this paper was supported by research grant MH-39230-3 from the National Institute of Mental Health.
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Brush, F.R. Genetic determinants of individual differences in avoidance learning: Behavioral and endocrine characteristics. Experientia 47, 1039–1050 (1991). https://doi.org/10.1007/BF01923339
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DOI: https://doi.org/10.1007/BF01923339
Key words
- Genetic selection
- Syracuse High and Low Avoidance strains
- Roman High and Low Avoidance strains
- Australian High and Low Avoidance strains
- Tokai High Avoider strain
- rats
- open-field behavior
- passive avoidance
- CER suppression
- stress-induced analgesia
- behavioral contrast
- pituitary-adrenal axis
- plasma and adrenal corticosterone