In addition, the results indicated that close adult surveillance also produced a similar decrement in subsequent intrinsic interest. In each of the studies, results indicated that asking children to engage in an activity of initial interest as a means to some ulterior end proved a consistently effective method for undermining these children's intrinsic interest in that activity. After these sessions, unobtrusive measures of the children's subsequent intrinsic interest were obtained during a series of free-play periods. The children agreed to engage in this target activity under three different reward. In each study, preschool children were asked to engage in an activity of initial intrinsic interest in individual experimental sessions. Three experiments were conducted to examine the effects of providing extrinsic rewards for engaging in an activity on children's subsequent intrinsic interest in that activity. OE has, in perspective, still several contributions to provide to the development of occupational health, including the systematic description of the present burden of work-related disease on our society the investigation of the mechanistic steps linking exposure to disease onset, in order to identify, in parallel, more adequate and effective prevention measures the validation of health surveillance and screening programs at work the study of the "causative" link between exposures and effects and the risk assessment for an evidence based management of the health risks at work. epidemiology which represents today a major research and public health activity. OE also represented the foundation for the development of environmental. One of the greatest contribution was the identification of occupational carcinogenic agents. Occupational epidemiology (OE) played a major role in the development of modern occupational medicine from a practice concerned with individual disease cases to a practice concerned with populations and their working environment.
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