System und Evolution des menschlichen Erkennens
Through signs the most elementary aids to communication in the phylogenetics of the animal kingdom and in the history of human thought became more complex – in the attempts of individuals to reach mutual understanding. They made it possible not only to exchange notions and concepts but also to make things thinkable and sayable.
They stand (a) at the beginning of and in first place among the material means of cognition in the broadest sense, alongside (b) the tools, created later, for separation (of physical analysis), © the instruments, unique to man, of sharpening and broadening perception, and (d) the instruments of measurement.
Their gnoseological classification, description and evolutionary depiction – in this 10th volume of the work System und Evolution des menschlichen Erkennens – involves a further, and absolutely fundamental, aspect of the system and evolution of human cognition.
This study classifies the whole range of semiotic phenomena according to the sensory channels through which they are sent and received.
The sequence of individual classes of signs begins with olfactory signs, proceeding to acoustic and then optical semiotic systems and eventually reaching the tactile, which were developed for those individuals to whom acoustic and optical channels were closed