Acceleration onset cueing

Motion platforms used in "Level D" full flight simulators (FFS) and equivalent military simulators have six jacks that can move the replica cockpit that is mounted on the platform in any of the six degrees of freedom (6 DOF) that can be experienced by any body free to move in space.

The jack layout used is generally that of the so-called Stewart platform, shown in a moving picture on the left and on which the simulator cabin will be mounted.

Acceleration onset cueing works in three phases: The various human body motion-sensors react to accelerations rather than steady-state motions and have thresholds below which they do not transmit signals to the brain (the latter explains why instruments are needed for safe cloud flying).

In the real world the brain is (subconsciously) expecting to receive the above motion cues before later registering the associated change in the visual scene.

[1] In contrast, civil airliner full flight simulators to the international Level D/Type 7 standard must have a 6-axis platform, and many military simulators for large aircraft and helicopters follow the civil Level D/Type 7 design.