This is the fundamental image model of any brain. When a new being is born,
the brain contains only the PSM. The PSM contains a collection of basic short
range models (e.g. reflex actions) and long-range models (e.g. the instincts)
for a minimal protection of that being and to ensure the unconditional
survival of that being, forever (these are the basic design features).
The PSM contains also a model of the external body (bones, muscles, and so on)
and also some basic models of interaction with the external reality (e.g. the
model to follow with the eyes the movement of an entity from external reality,
or the model to touch an entity from external reality, which is in the range
of the hand). There are also some models to ensure the equilibrium of the
physical body.
Faced with a new external reality, the PSM is activated and it tries to solve
the problem, based on its short-range models (e.g. reflex actions), but it
will also create a new element, which is associated to the new external
reality. Once the new element is created by PSM, this element is self-
developing as a model, in order to understand the new external reality. When
such an external reality occurs again, the specialized model created during
the first occurence of the new external reality will be activated instead of
the PSM. Such models are normal models (they do not belong to PSM).
Thus, as a new born being gains experience, the PSM will not be activated, but
the models previously created in the interaction of that being with the
external reality.
A model, which belongs to PSM, cannot be changed regardless of the information
received from external reality (the PSM contains only invariant models). In
special conditions, e.g. when a big danger exists for the being (as detected
by PSM), it is possible that a new model enters the PSM. Basically speaking,
any model can enter the PSM. For a normal brain, the PSM must contain only
"standard models" (see the general theory and ETAs) because, once a model is
in PSM, it cannot be changed regardless of the information received from
external reality. Even more, any information from external reality can be
accepted only if it can be accepted by PSM.
Example: Let's suppose that in the PSM of a person there is a non-standard
model which considers that the frogs are very dangerous. Regardless of the
information received from external reality, that person will be horrified when
frogs are around.
The content of the PSM is very hard to be known because the PSM is activated
only when there is no normal model to understand the external reality.
The PSM is an image model and it will remain so forever.