Over time the forms of and ideas about communication have evolved through the continuing progression of technology. Advances include communications psychology and media psychology, an emerging field of study.
The progression of written communication can be be divided into three "information communication revolutions":[7]
Written communication first emerged through the use of pictographs. The pictograms were made in stone, hence written communication was not yet mobile.
The next step occurred when writing began to appear on paper, papyrus, clay, wax, etc. with common alphabets. Communication became mobile.
The final stage is characterized by the transfer of information through controlled waves of electromagnetic radiation (i.e., radio, microwave, infrared) and other electronic signals.