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Neonatal hyperthyroidism in the rat: thyroxine accelerates the development of unconditioned but not learned responses
Abstract:
The effects of neonatal hyperthyroidism induced by thyroxine injection on the development of unconditioned and learned behaviors mediated by the gustatory system of the rat were investigated. The development of unconditioned ingestive responses evoked by 10% sucrose and 0.1% HCl taste solutions was advanced several days by thyroxine treatment. However, the emergence of taste aversion learning involving 10% sucrose and LiCl injection was not advanced and may have been slightly delayed. Thus, the ontogenesis of unconditioned and learned behaviors mediated by the gustatory system was not influenced uniformly by neonatal thyroxine treatment.
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