In our introduction to this special issue on semiotics and psychology, we outline the background and motivation for this project, preview the main themes addressed by the seven contributions, and draw some conclusions about the mutual relevance of psychology and semiotics for each other. Our motives for undertaking this special issue were basically three-fold. First, we were curious, given the recent decline of traditional approaches to cognitive psychology, about the status of sign- or symbol-processing explanations of human cognition and behavior. Second, we were interested in the practical application of semiotics to understanding recent developments in electronic communication systems, particularly in the domain of non-linguistic commun...