ABSTRACT
In contrast to physical-chemical interactions on an abiotic planet, communicative interactions on biotic planets are mediated by signs. The use of signs in communicative interactions must be learned somehow. In social experiences, living agents learn to use more than one sign and combine multiple different signs into sign sequences to communicate complex content. Communication is a kind of social interaction. Communication is the essential interaction to common understanding of content. Social interaction experience is embedded into a cultural background history. The meaning of a sign sequence or a “word” or any other sign used to communicate is a social function. Communicating living agents are able, in principle, to generate new communicative patterns for better or innovative adaptation to a new and unforeseeable situation. If communication is the main characteristic of life, it must be possible to identify communicative actions throughout all domains of life. To learn a natural language means to communicate basic everyday needs with community members.
