A new challenge to ethical codes: Heart transplants

Summary We have entered into a new era of medical achievement with the development of successful transplantation of human organs. The transplantation of the heart has aroused the greatest scientific interest and at the same time created serious new problems of an ethical and legal nature. It has been necessary to develop new criteria to determine the moment of death of the donor in order to ensure continued life for the recipient. The decision of the moment of death should be made by a small team of skilled physicians interested in furthering this important development, but not as emotionally involved as are the surgeons awaiting the chance to prolong their patient's life with a new heart. Available and suitable hearts will probably always be in very short supply, and the selection of recipients will therefore become critical if the procedure proves to be widely acceptable.New laws will be essential before this process can be adopted in many states and countries. The cost in terms of total resources is so large that careful evaluation of the long-term results must be undertaken after a reasonable number of patients have been operated on and observed, perhaps at the end of the second year following the first procedure. Since the cost of each operation of this type approximates that of the education of several young physicians who could care for thousands of patients during their life span, a good hard look at the potential benefits and ultimate values is in order. At this point in time it is extremely important that this type of surgery be encouraged but limited to those prepared to undertake it with maximum skill and minimal risk. At present it must be recognized as a great experiment rather than a therapeutic triumph for general application.     

Visually discriminated behavior in a "blind" adolescent retardate

A 16-yr-old retarded male, diagnosed organically blind and treated by those around him as a blind person, was given practice in discriminating visual stimuli. After training, he responded with significantly better than chance accuracy in a choice situation in which stimuli were as small as 18 pt Futura Medium type. In addition, he was trained to look at the experimenter's eyes when instructed to do so. Control procedures revealed that it was the reinforcement contingency that functioned to establish and maintain eye contact. Eye contact with the experimenter generalized in a limited way to situations in which this behavior was not reinforced, though not to a neutral individual. When the boy was required to use visual cues to help himself in a cafeteria line, he soon emitted the necessary behaviors, where formerly he had been assisted by others. Resumption of assistance markedly decreased self-help, suggesting that continued use of any newly learned skills would depend on the response of the individuals in his environment. The boy also learned eating behavior that appeared to require the use of visual cues.     

ECOLOGY AND SOCIALIZATION AS FACTORS IN FIGURAL ASSIMILATION AND THE RESOLUTION OF BINOCULAR RIVALRY1

L'étude des facteurs culturels en matière de perception et L'étude des facteurs culturels en matière de personnalité ont été, jusqu' à présent, relativement séparées. L'A. propose un modèle qui permet d'intégrer les deux domaines en faisant L'hypothèse d'une relation indirecte entre L'ecologie et les réponses perceptives et d'une relation directe qui correspondrait à celle mise en évidence par les études de laboratoires classiques entre fréquence de L'expérience passée et réponse perceptive. Pour valider le modèle, L'A. utilise les données de deux expériences qui ont été réalisées avec des sujets Temne et Esquimaux et qui portent L'une sur la reproduction de figures ambiguës présentées au tachistoscope et L'autre sur la résolution de rivalités binoculaires.