Abstract
Morphine-addicted rats, tested under four different abstinence periods on wheel activity, showed no changes as did a group undergoing analogous periods of food deprivation. Several hypotheses are discussed concerning why morphine withdrawal might be expected to differ from hunger in its effect on activity.
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Trost, R.C., Knott, P.D. A comparison of morphine and food deprivation on wheel activity. Psychon Sci 17, 25–26 (1969). https://doi.org/10.3758/BF03329148
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DOI: https://doi.org/10.3758/BF03329148