Posturology is
a new medical discipline. It studies disorders of the central
nervous system thanks to the categories of space AND TIME.
Indeed, at the end of the XIXth
century, Jean-Marie CHARCOT and the Salpetriêre's French
school suggested to isolate the disorders of the central nervous
system that were caused by a lesion - i.e. that belonged to a
spatial, anatomic category. That fertile suggestion led to the
foundation of Neurology. But the first neurologists themselves
suffered the dialectic effect of their suggestion: they did not
know what to say anymore on the disorders of the central nervous
system that did not belong to the categories of Neurology because
they did not correspond to any lesion.
The failure of BABINSKI's works
on pithiatism at the end of the XIXth century is well known. His
interrogations, together with FROMENT, on the functional disorders
are less known - they could not find any answer because fundamental
mathematical notions were lacking at the time. In the early XXth
century, POINCARÉ's thoughts on recalcitrant differential
equations opened the way to topology, a basic tool for non-linear
dynamic analysis, that only truly developed at the end of the
XXth century thanks to Russian mathematicians and calculators.
That kind of analysis allows doctors
to introduce the category of TIME in their approach to the central
nervous system. Indeed, that system controls many functions, as
the postural one, thanks to retroaction loops during which what
happens at instant t depends on what happened at instant t-1.
Now, the mathematical functions that express that logic of chained
temporal series (as the "logistic" equation, for instance)
are not linear, there is no proportionality between the effect
and the causes: a minor variation of a factor can lead to the
appearance of very important consequences, whereas an important
variation will not necessarily have major consequences - what
we call "the butterfly effect" since LORENTZ.
Jean-Bernard BARON was the first
doctor, as far as we know, to observe the "butterfly effect"
during his experiences (1955) on the regulation of the postural
tonic activity. Following and continuing those works, many doctors
in southern Europe started to study disorders of the central nervous
system whose logical structure is based, not on an anatomical
lesion, but on the chaotic logic of chained temporal series. Such
studies - particularly vigorous in the field of postural control
- constitute Posturology.
The fundamental concepts of posturology
being essentially Latin, that discipline still finds it hard to
develop outside southern Europe.
There is an international Society: the International
Society for Postural and Gait Reseach, which was founded in 1969
at Amsterdam (its name was: «International Society of Posturography»,
at this time), its current secretary is: Doctor Herman KINGMA,
ENT Dpt, university Hospital of Maastricht, Holland, <secr@kno.azm.nl>.
There is also local associations in some countries
(Japan, Italy, Canada, Argentina, France).
The actual president of the «Association Posture et Équilibre»
is Michel LACOUR, <lacour@newsup.univ-mrs.fr> (please do
not to disturb him)
The current president of the Italian Association
of clinical Posturology is Alfredo MARINO <postur@tin.it>
The current president of the «Association
de Posturopodie Internationale» is Philippe VILLENEUVE,
<phvilleneuve@compuserve.com>.