NEUR 3403 Lecture 1: Prepare for M1
8 Dec 2017
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Document Summary
Berthold is particularly famous for his work on endocrinology. 1 849, was the first to engage in the formal study of behavioral endocrinology when he performed ground breaking experiments with chicken castration. Berthold noted that the male chickens (roosters) were aggressive; had pronounced comb and wattle; muscles were more developed; crowed; copulated with hens. On the other hand, berthold noted that the female chickens (hens) were not aggressive; had no comb and wattle; did not crow; did not copulate with hens. Berhold"s experiment showed that when castrated roosters developed the body and behavior of capons: they failed to develop comb and wattle characteristics of roosters; failed to crow; failed to be aggressive; and failed to copulate. Berhold"s experiment showed that transplanted testes (that established a blood connection) became functional (i. e. , produced sperm and a blood-borne product that affects anatomy and behavior). Group 1: control group - the roosters were kept capons.
