 Here it is important to point out that the notion of thought style has received, by and large, two different developments in contemporary research, which also affect mathematics. First, there is the notion encountered in Fleck. Depending on how generous one wants to be in drawing connections, one could see this approach to styles of thought to be related to the later work by Kuhn, Foucault and Hacking (see below for a discussion of Hacking). There is however a different way of thinking about styles of thought, which usually goes under the name of cognitive styles. This is an area of interest to cognitive psychologists and mathematical educators (for an overview of the psychological research in this area see Riding 2000 and Stenberg and Grigorenko 2001). Here the focus is on the psychological make up of the individual who displays preference for a certain cognitive style either in learning, understanding or thinking about mathematics (i.e., processing and organizing mathematical information). The old distinction between visual and analytic mathematicians emphasized by Poincaré (see Poincaré 1905) is still part of the picture although there are a great variety of models and classifications. For an historical overview and a theoretical proposal centered on mathematics see Borromeo Ferri 2005.