ETA 17: The history of evolution of the human species, based on MDT
The primary data are taken from different dictionaries, as this data is universally accepted. Only data associated with the development of the symbolic models have been selected.
Note: The dictionaries present the data mainly based on feeling, or based on local models, to select what is important or not. I selected only the data associated with the evolution of the symbolic models, as MDT understands this process. The evolution of the human species means the increase of power of the symbolic model. This history follows just this idea.
70 milions years ago: The first superior monkeys 4 milions years ago: Some monkeys walk. 2 milions years ago: Stone tools. This is associated with the appearance on large scale of the long-range image models.
200 thousands years ago: Homo Sapiens. Homo Sapiens was able to build easily long-range image models. Usually, when a model is good, there is the tendency to integrate it into the PSM. A PSM model is very efficient, but, because it is invariant, it slows down the evolution. Homo Sapiens seems to have evolved in a direction contrary to long-range efficiency. That is, instead of including them in the PSM, such models were changed on and on, and they were not transmitted to the next generation by heredity, but by social life of the groups. That is, the groups were stable for a very long time. It is not clear if Homo Sapiens was able to communicate based on symbolic models, but, for sure, the communication was based on symbolic elements, at least in part.
130 thousands years ago: Art-type, religion-type activities. On such a level, it is clear that the construction of long-range image models was very easy and thus, the prediction of death and death itself were understood. Art and religion cannot be directly associated with the symbolic models, so we don't know if the language itself, as a symbolic model, appeared at that time.
Based on MDT, the human being is the being which is able to make and operate symbolic models (a language, as a minimal requirement).
Thus, I don't know, based on the data, when the language appeared, but the supposition is that it was under development, once the activities were so complex by comparison to the animal level.
Several thousands years ago: the cities.
A full language was already created and some elements of the writing too.
3700 years ago: the first phonetical elements for writing appeared, and later (about 2900 years ago), the first phonetic alphabet.