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The issue of low doses has a long history, initially stemming from radioactivity. It can be followed up through a series of metrological controversies about risk assessment on environmental health issues. Building on recent developments of public policy around the hazards linked to endocrine disruptors, this paper offers an exploration of different epistemic logics shaping research and expertise circles involved in low doses issues. Relying on a literature review, participative observation and a series of interviews with experts, this paper examines cognitive and technical supports used by the experts, and strives to depict the pragmatic conditions of a so-called "paradigm shift", purported to reshape the key concepts and tools of toxicology for the 21th century. [ABSTRACT FROM AUTHOR]

Thanks to data from the French Environmental Barometer EDF-R&D 2004 (national representative sample of French aged over 15), this paper investigated lay risk perceptions related to exposure to electromagnetic fields (from an electric power-line, a TV, a cellular phone or micro-wave oven). Answers to an opened-ended question suggested that many people worry about such exposure: it may interfere with natural electricity circulating in the human body, disturb the nervous system and cause cancer. These answers revealed a conception of human body, health and disease, and participants referred to various kinds of arguments, from expert knowledge to personal intuition. Statistical analyses showed that risk perceptions related to these four devices were strongly correlated with each other and shared common predictors. These results suggest that these risk perceptions are built within the same perceptive frame. One should not consider them as "false beliefs": they are based on consistent conceptions of the body, health and disease, they are fuelled by the contemporary levelling of knowledge, and they reflect the difficulties experienced by many people living in a changing world. [ABSTRACT FROM AUTHOR]