The neuron is a cell. Like any cell,
it is very complex. It is however, the smallest element of the nervous sytem.
The nervous system is not a computer. A computer is simple, in comparison. Our
brain functions in a massively parallel way. Interneurons connections are not
permaments, but into perpetual rearangement. We do not know, the used means, to store information.
The setting in network, of some
neurons, exceeds our comprehension. The algorithms, developed in this
direction, does not take account of the constraints, imposed by Nature.
The sensitive neuron is, as we said,
a cell of information. Events which comes to us must be ;
- collected initially. Information must belong to
our genetic capital of perception.
- transforms and coded to indicate intensity of
event.
- transmitted to the higher centers (possible
filtering?).
- interpreted by the central nervous system.
The sensitive neuron has sensors
sensitive to ;
- variations in temperatures.
- variations of pressure.
- variations of elasticity.
- variations of integrity.
- variations of position.
The neuron is unable to code
directly ;
- the light. It uses specialized cells.
- the electrical current Some of our sensors are
diverted of their function of origin to transmit the electric feeling.
- the sound. It uses specialized cells.
- the taste It uses specialized cells.
- the sense of smell It uses specialized cells.
Like any sensor, our neuron has an range of sensitivity. It is not able all to perceive. These limits are related
to the safeguarding of the integrity of individual.
If the intensity of event is:
- Too much weak, the response remains local.
Information is not transmitted because it is out of our field of perception.
- Normal, the answer is transmitted, after coding
of its intensity. The intensity is coded by a relation intensity/frequency of
the spikes.
- Too much strong, the answer is transmitted, but
coding is saturated. The destruction of the sensors is possible.
If the time of application of
information is :
- Too much slow, the answer remains local. No
transmission.
- Normal, the answer is transmitted.
- Too much fast, the answer is not transmitted.
The response time is related to the
design even sensor. It is a hydraulic sensor, all our sensors contain liquid.
The liquid allows a good remote control. The liquid dilates and is compressed
according to the temperature. The liquids transmit the pressures. The liquids
can deform membrane envelopes. The liquids have an inertia.
The liquids used, contain ions. The
transmission of information is an active phenomenon. The neuron, at rest, is
fore-exited. It is like a tended bow, the stored energy is ready for the
transmission of useful information. The ionic channels maintain this charge. In
the event of too slow information, the system returns at rest. Too fast
information, cannot be taken into account. It is necessary a minimal time so
that the molecular pumps enter in action.
|
transmission |
short duration (Brief) |
average duration (Normal) |
long duration (Length) |
|
low intensity (Low) |
not |
not |
not |
|
average intensity (Medium) |
not |
yes |
yes |
|
strong intensity (Strong) |
not, danger |
yes, danger |
yes, danger |
The one short duration case and a strong intensity
is a very dangerous phenomenon. It is not transmitted, therefore not perceived,
but remains dangereous because of its contents.
