Abstract
To investigate the possible interaction of adrenergic and cholinergic systems in the mediation of tonic immobility (TI) in chickens, 40 cockerel chicks were divided into two groups that received 5 mg/kg or 1.0 mg/kg of epinephrine. Half of each of these groups were given 1.0 mg/kg or 2.5 mg/kg of scopolamine prior to testing for TI duration. Results indicated that the highest dose of epinephrine significantly increased TI duration. Although the highest dose of scopolamine attenuated the duration of TI at both epinephrine levels, the effect was not significant.
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Thompson, R.W., Jensen, D. Adrenergic and cholinergic systems and tonic immobility in chickens. Bull. Psychon. Soc. 14, 467–468 (1979). https://doi.org/10.3758/BF03329513
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DOI: https://doi.org/10.3758/BF03329513