Based on formal-theoretical principles about the \ud
sign processes involved, we have built synthetic experiments \ud
to investigate the emergence of communication based on \ud
symbols and indexes in a distributed system of sign users, \ud
following theoretical constraints from C.S.Peirce theory of \ud
signs, following a Synthetic Semiotics approach. In this paper, we summarize these computational experiments and results regarding associative learning processes of symbolic sign modality and cognitive conditions in an evolutionary process for the emergence of either symbol-based or index-based communication
