Many successful sciences both serve and shape human ends. Conversely, the societies in which these sciences are practiced support the research and provide interpretive context. These mutual influences may result in a positive feedback loop that reinforces constitutive and contextual values, embedding them in scientific concepts: the ADHD concept is a case in point. In an ongoing process, social considerations fuel investigational choices and contexts for evaluating data. Scientific study forwards the feedback loop through the influence of investigative trends, by (...) directly and indirectly embedding values in data interpretation, and by core methodologies that heighten the contrast between ‘ADHD’ and ‘normal’. The resulting scientific conclusions embed value valences in the ADHD concept; social uptake of that valenced concept begins another round of interest in its implications and support of the science. The processes at work in the ADHD case are very general, so we should expect to see similar processes and results in other fields. (shrink)