A type of spatial disorientation caused by the physical senses sending conflicting signals to the brain. Vertigo is specially hazardous when flying under conditions of poor visibility. The eyes send a signal to the brain telling it the airplane is in one condition, while the deep muscles, “the seat of the pants,” tell the brain the airplane is in another condition. The inner ear tells still another story, and the result is confusion

— vertigo.

Vertigo may cause pilot incapacitation, but may be minimized by confidence in the indication of the flight instruments.