الفهرس 
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Abstract
INTRODUCTION
Motion sickness is a specific disorder whi~h is
evoked in susceptible persons and animals when they
are subjected to movements which have certain characteristics.
Tyler and Bard (1949) stated that Irwin, 1881,
appears to have been the first to use the expression.
He suggested that seasickness might more correctly be
termed motion sickness, ”for not only does it occur
’on lakes and even on rivers, but as it well known, a
sickness identical in kind may be induced by various
other motions than that of turbulent water.” He thus
introduced a convenient and accurate general term,
but it did not gain wide use until Tyler and Bard
(1949) grouped under the term motion sickness ’’a variety
of conditions akin to seasickness and due to frequently
repeated ossicillatory movements of the body.’’
Since that time and uptil now many papers have r
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been written, many experiments were done and several
ideas and theories have been evolved about motion
sickness.
The interest about this phenomena~ increased in
recent years as a major concern in nanned space flight,
and as an intriguingclinical entity on its own right.