Social context is generally thought toinfluence how humans act. Here we argue thathumans rarely accept the context as it isgiven, but rather undertake conscious actionsto make it favourable. The example chosen isfrom northern Cameroon, where nomad herdsmeninduce the sedentary farmers to trust them, bydifferent means: creation of interpersonallinks, exhibition of good behaviours byrespecting certain norms. Trust is consideredas an element of the context, necessary forthem to perform acts that present a certainrisk. An attempt was made to translate one ofthe traditional (...) behaviours into a model,implemented in an artificial society:autonomous agents would make gifts in order tocreate an image of themselves in a group. Inthe simulations, a form of reputationstratification appears in time. One notes thatan agent can build the image it wants only ifthe part of the population that wants to beinvolved in the same dynamic is big enough. Asa conclusion, we suggest that althoughindividuals try to create consciously a contextfor their living, this is not just anindividual choice, but needs a commonbackground of rules, a context enabling contextcreation. (shrink)

In our paper we propose a philosophicalanalysis, based on the notion ofphenomenological model, of Nuclear Physics. Inthis way, we will show some peculiarities ofthis branch of physics.

The research on which the present paper makes a point in aimed at designing a cognitive model of Albert Einstein's discovery that is based on fundamental Einstein's publications and placed, ideally, at a meso-level, between macro-historical and micro-cognitive reconstructions (e.g. protocol analysis). As in a cognitive-historical analysis, we will trace some discovery heuristics in the construction of representations, that are on a continuum with those we employ in ordinary problem solving. Firstly, some theory-specific, reflexive heuristics—named orientative heuristics—are traced: inner perfection, (...) explain-or-assume, explanatory correspondence, and covariance/invariance. Then, other well-known abstractive heuristics as analogical and imagistic reasoning, thought experiment, limiting case analysis (e.g. Nersessian 1992) are shown occurring in Einstein's key-publications. A sketch of a socio-cognitive model for his discovery is then presented following two suggestions: (a) an idea of Van Fraassen about discovery phases, and (b) the Humean distinction between beliefs and ideas. (shrink)