In common understanding, we tend to equate communication with language: speaking, writing, and exchanging information. However, neurobiology shows that this is only the most visible layer of a much deeper process. Furthermore, every form of communication involves emotions. Even the most abstract statement, e.g. mathematical, scientific or technical, takes place in a specific emotional atmosphere that influences the way it is received. In addition, every message can be interpreted differently by different people. This is influenced by many factors, including the unreliability of memory. These days, overstimulation and the difficulty of organising an excess of inconsistent messages are also significant communication challenges from the brain’s point of view.