Abstract
Two major studies and a number of pilot studies involving 100 descendants of the Berkeley S1 and S3 strains of rats were accomplished in a versatile automated maze. Positive- and negative-reinforcement paradigms were used in separate experiments, and the “dull” S3s consistently showed superior performance o n visual-discrimination and reversal discrimination problems. It is concluded that traditional “bright” and “dull” labels are clearly faulty for these strains.
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References
Markowitz, H., & Saslow, M. G. A reliable silent electronic shock scrambler. Journal of the Experimental Analysis of Behavior, 1964, 7, 267–268.
Markowitz, H., & Sorrells, J. M., Jr. Performance of “maze-bright” and ”maze-dull“ rats on an atuomated visual discrimination task. 1969, 15, 171–172.
Notes
We wish to thank Carol Saslow and Bea Markowitz for their help with the statistical analysis and graphic presentation.
This investigation was supported in part by the following grants to M. R. Rosenzweig, D. Krech, and E. L. Bennett: Grant MH-1292 from the National Institute of Mental Health, U.S.P.H.S.; GB 291 from the National Science Foundation; and Contract DA-49-193-MD-2329 from the Office of the Surgeon General.
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Markowitz, H., Becker, C.J. Superiority of “maze-dull” animals on visual tasks in an automated maze. Psychon. Sci. 17, 257–258 (1969). https://doi.org/10.3758/BF03336516
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DOI: https://doi.org/10.3758/BF03336516