ONE Introduction The history of psychology in the twentieth century is a story of the divorce and remarriage of psychology and philosophy. ...

Psychologists debate whether mental attributes can be quantified or whether they admit only qualitative comparisons of more and less. Their disagreement is not merely terminological, for it bears upon the permissibility of various statistical techniques. This article contributes to the discussion in two stages. First it explains how temperature, which was originally a qualitative concept, came to occupy its position as an unquestionably quantitative concept (§§1–4). Specifically, it lays out the circumstances in which thermometers, which register quantitative (or cardinal) differences, (...) became distinguishable from thermoscopes, which register merely qualitative (or ordinal) differences. I argue that this distinction became possible thanks to the work of Joseph Black, ca. 1760. Second, the article contends that the model implicit in temperature’s quantitative status offers a better way for thinking about the quantitative status of mental attributes than models from measurement theory (§§5–6). (shrink)

This is the first comprehensive view of the work of scholars in several different disciplines contributing to the development of the psychology of science. This new field of inquiry is a systematic elaboration and application of psychological concepts and methods to clarify the nature of the scientific enterprise. While the psychology of science overlaps the philosophy, history, and sociology of science in important ways, its predominant focus is on individuals and small groups, rather than broad social institutions and concepts. The (...) introduction surveys the field and traces its evolution in a historical context. Several contributors address epistemological issues raised by the psychology of science. Subsequent chapters discuss developments in the cognitive psychology of science, scientific theory, and the influence of social relationships on scientists' work. The conclusion proposes an agenda for further progress in this new approach to understanding science. (shrink)