Science education research has examined the benefits of coteaching for learning to teach in elementary and secondary school contexts where coteachers bring variable levels of experience to the work of coteaching. Coteaching as a pedagogical strategy is being implemented at the university level but with limited research. Drawing from the field of activity theory and our emic experience as coteachers, we examine the enactment of coteaching in university science education courses. One of the tools central to our examination of coteaching included the analysis of disturbances in the work and object of preparing science teachers. This analysis highlighted the role, during discursive interactions, of problem posing and problem solving for addressing observed disturbances. The presence of an extra instructor provided increased opportunities in the system for recognizing and valuing disturbances as indicators of underlying contradictions or tensions in elements of the activity system of the learning and teaching of science teachers. Our analysis suggests that coteaching offers expanded opportunities for the evolution of the activity system of preparing science teachers.
Case 19.-A heavyweight aged 31 was knocked out "through the ropes" in 1945 and was dazed for the next 24 hours. The right leg was found to be weak immediately after his fight and continued so. Within the day or two following this same fight his right hand began to shake: the left hand started to tremble some six months later. He was hospitalized seven years later, a typical severe punch-drunk.Case 20.-A delinquent mild punch-drunk, interviewed in prison, gave up boxing at the age of 20 because he was not feeling himself. He felt drunk although he had taken nothing in the way of alcohol: his head would be in a swim after each fight.Case 21.-A Royal Navy welterweight, aged 22, matched against a tougher opponent, was struck heavily over the heart in the second round, causing him to feel dizzy or groggy. Shortly after he got a severe blow to the side of the head, flooring him for a count of nine, when he rose and resumed the fight. He could remember vividly every incident up till then; but after that his memory was a blank.Apparently he finished the second round, and in the third round he received heavy punishment, being knocked down 10 times, striking his head on the floor more than once. His next recollection is being on the deck of his ship about an hour later, feeling dizzy and sore about the stomach.Two weeks later he became ill with headaches, vertigo, and vomiting, and was hospitalized. Investigation showed old blood-staining of the C.S.F. Conclusions There is much in boxing to interest a practising neurologist, and special attention should be focused upon (1) the phenomenon of groggy states as occurring during or after a contest, and (2) the condition known as traumatic progressive encephalopathy (or punchdrunkenness).Owing to the extreme paucity of pathological data, it is highly desirable that opportunity should be afforded neuropathologists of studying the appearances in the brain of punch-drunk patients. Ass., 91, 1103. Pampus, F., andGrote. W. (1956). Arch. Psychiat. Nervenkr., 194, 152. Ptfeifer. K. (1922). Der Faustkampf. Leipzig. Sherrington. C. (1906). Inteerative Action of the Nervous System. London.Somen. H. . Paris mtfd., 13, 54. Steinhau%. A. H. (1950a). Look, 14, 35. -(1950b The medical aspects of boxing continue to attract attention in both the medical and the lay press. Recent attacks on the sport (Doggart, 1955; Summerskill, 1956) have aroused further controversy, and the reports of death (Rottgen, 1955; Pampus and Muller, 1956;Muller, 1956) and of possible brain damage (
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