By
providing input to this simulation you can view an idealization
of the response of the inner ear to different forms
of cross-coupled motion. For demonstration purposes
we assume that the canals of the inner ear are aligned
with the head pitch, roll, and yaw axes. To view what
is happening to the canals, simply follow the directions
through each step and observe the outcome.
Here
is the typical case of a participant spinning clockwise:
First,
imagine yourself lying on your back on a rotating bed.
When you hold your head still you will NOT feel the
rotation of the bed that spins at a constant rate (e.g.
23 rpm). The reason is that the semi-circular canals
of the inner ear are only sensitive to angular acceleration,
that is to velocity changes. However, as soon as you
move your head (here limited to 90-degree head turns)
very strange things happen. The rotation of the bed
interacts with the vestibular system and produces strong
illusions. The particpant feels to turn and tumble in
ways that are inconsistent with the other senses. Using
the interface below to find out what is happening in
the semi-circular canals when you trun your head in
a particular way. There are several different ways in
which you can move your head. You can perform the motion
you wish to observe (for example, click "Turn Right"
from the initial position to view the effects of turning
your head to the right). You cannot throw your head
backwards beyond the support surface beneath you.
Good.
Now, as you turn your head, the bed beneath you is
going to spin.
In the interface below, choose the direction in which
you wish to spin.
