Abstract
IT has been reported1–2 that the natural preference of mice for the dark can be reversed by injection of brain extracts taken from donors trained to avoid a black box. This effect was considered to represent a "transfer of learned fear". The possibility remained, however, that the apparent transfer was caused by a substance produced in response to the stress of repeated shocking rather than as a result of learning. A test was therefore carried out to see whether a similar transfer could be obtained with extracts from donors trained to prefer a white box using positive reinforcement.
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References
Gay, R., and Raphelson, A., Psychon. Sci., 8, 369 (1967).
Ungar, G., Galvan, L., and Clark, R. H., Nature, 217, 1259 (1968).
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FJERDINGSTAD, E. Chemical Transfer of Learned Preference. Nature 222, 1079–1080 (1969). https://doi.org/10.1038/2221079a0
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DOI: https://doi.org/10.1038/2221079a0
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