Experiments show that, in a controlled environment, some monkeys build and
operate some primitive symbolic models. They might implement this function by
software, based on image models. However, these very singular examples prove
their incapacity to evolve towards a symbolic model, in fact.
One of the most striking characteristics of these animals is their lack of
stability in a model. The most intelligent monkeys are those which have the
capacity to stay in a model, when the external reality gives them many
opportunities to change the active model. If the monkeys had stability in a
model, then they could have better performance at building symbolic models,
under the human control.
In spite of the fact that MDT does not sustain the evolution of man from
monkey, the behaviour resemblance of monkeys and humans, on image models of
course, is striking.