OBSERVATIONS ON THE BEHAVIOR OF PIGEONS WITH RESTRICTED LESIONS IN THE TELENCEPHALON.
Technical rept. (final) App. 2,
STOCKHOLM UNIV (SWEDEN) DEPT OF ZOOLOGY
Pagination or Media Count:
In 10 pigeons restricted lesions were made in the telencephalon by means of high energy proton beams. The lesions were situated in the posterior and medial striatum. All the pigeons were normal as regards eating, drinking and flying. When flying they were able to avoid obstacles and to land normally. The blinking reflexes and the reactions to sounds were normal in all the pigeons. Seven pigeons showed abnormally strong escape responses for 10 - 15 days after the radiation or in one case for all the time after the radiation while three pigeons were normal. In two pigeons the escape responses disappeared after about 60 days and in one pigeon these responses were very weakened after 55 days. In these three last pigeons, such behaviors were observed, as are otherwise seen in pigeons imprinted to man. These behaviors comprised aggressive pecking, wing vibrating and nodding. Wing vibrating was also observed occasionally with the pigeon with persisting strong escape responses. Learning experiments with 7 of the pigeons gave the result that two pigeons had a decreased ability of remembering compared with normal pigeons. These two pigeons had lesions in the medial striatum. In none of the pigeons have we seen behavioral changes of the kind seen as symptoms of fully decerebrated pigeons. Author
- Anatomy and Physiology