The balance control area of your brain acts like the pilot of an aeroplane, making adjustments to the controls to keep your body in balance. The pilot of an aeroplane does not need instruments to fly straight and level if the weather outside is good, and he can see the horizon. Even if the aeroplane instruments are faulty and give a false reading, it doesn't have to cause a problem with the flight, provided that
The pilot knows to ignore the faulty instrument,or the faulty instrument gives a predictable and stable mis-read, and the pilot knows by how much, and in what direction, so that he can compensate for the error.
He will always find it much easier if he has other independent sources of the necessary information
If, however, the aeroplane has faulty instruments and the pilot tries to fly through cloud, he is then forced to rely on those faulty instruments.
If he then takes those false readings at face value, believes them to be true, and makes adjustments to the controls accordingly, he will almost certainly end up crashing.
This is what happens to a person with false signals from a damaged inner ear who tries to walk in the dark across uneven ground. source-http://www.entkent.com