Discussions on Per- and Postrotatory Tests for Diagnostic Nystagmus Stimulation in the Neurootological Laboratory from 1970 till 2010

Bencze Gabor, et all

The rotatory chair position is seated on a church-bell held with ball bearings. However, additionally, the bioelectrical potentials, which were derived by pairs of ENG-electrodes sitting on either side of the two eyes in the horizontal plane and above and below the two eyes in the vertical planes, had to be sent out through the axis of the chair.
There are at least three ways to measure the perrotatory nystagmus. The first is to stepwise increase the accelerative forces in a trapezoidal scheme. The second is to take a standard acceleration as it is used in the Claussen laboratories with three degrees per second square.
This highest postrotatory accelerations can be reached by breaking, for instance, the rotatory chair at an acceleration of 90 degrees per second within a third of a second. Then, the acceleration force amounts up to 270 degrees per second square, however, only within a needle-shaped time interval of a third of a second.
The upper boarder of accelerative force sensation amounts to 180 degrees per second square.

When analyzing the test results, it easily can be seen that the lower liminal detection acceleration of the trapezoidal scheme or of the three degrees per second square scheme is handled more or less by lower parts of the brain, which interactions of the cerebellum and the brainstem. However, the needle-shaped highest acceleration force is handled also by the supratentorial areas like the basal ganglia.

The questions, which you must be taken fom our data bank are:

1.) Rotatory chair
2.) Perrotatory nystagmus
3.) Postrotatory nystagmus
4.) Vestibular recruitment
5.) Vestibular evoked potentials

With these data and a network of these data, we then can build up a complete concept of diagnostic predictions..