The Electrical Activity of the Pupal Brain in the Diapausing and Developing Pupa of the Giant Silkmoth, Philosamia cynthia cynthia.

The electrical activity of the pupal brain of the giant silkmoth, Philosamia c. cynthia was measured during diapausing and developing period of the pupa. The endocrinological activity of the brain was tested by means of the extirpation and the transplantation of the brain after the measurement of the electrical activity. The electrical activity of the pupal brain was inactive in the diapausing pupae. It became active in some marginal periods of the incubation at higher temperatures after chilling. Results of the extirpation and transplantation experiments of the brain clearly showed that the electrically inactive brain of the pupa was also in the endocrinologically inactive state, and the electrical activity of the pupal brain occurred previous to the endocrinological activity. These results obtained from the present experiments were in accordance with the WILLIAMS' results and the fact suggested by VAN DER KLOOT.Article信州大学理学部紀要 3(1): 71-83(1968)departmental bulletin pape