Founder of American pragmatism, Charles Sanders Peirce (1839-1914) is considered the logician of this movement. He was however, just as much as William James, a great psychologist, working on the development of nascent experimental psychology, trying above all to think about the possible links between logic, psychology and metaphysics, by the elaboration of a "logical analysis of products of thought ”, inspired by Kantianism and medieval times (Ockam and Duns Scotus). A determined anti-psychologist and yet favourable to the taking into account of certain facts of psychology, anxious to extend formal logic to its philosophical (or semiotic) dimension, Peirce wanted to build a new model of the mind, which would extend to d 'other forms of intelligence than human thought, by a formal use of signs which nevertheless remains attentive to their irreducible wave. By presenting the main axes of this project - criticism of intuition and internalism, wave of sensation, theory of thought-sign, semiotics of the wave, reflections on logical machines, intentionality and mental images, |