Aerospace Physiology 25-07 Practice Test 2026 - Free Aerospace Physiology Practice Questions and Study Guide

The otolith organs in the vestibular system sense linear acceleration and gravity. When you experience linear acceleration, the inertia of the body makes the otoliths signal a tilt or change in orientation, even if your actual attitude hasn’t changed. That mismatch leads to misperceptions of how you’re pitched or leveled, producing what are called somatogravic illusions. A common example is feeling nose-up during forward acceleration (a pitch-up illusion) or nose-down during deceleration, even though the aircraft is level. The Leans comes from a different mechanism tied to the semicircular canals during a turn, and the Coriolis Illusion arises from head movements in a turning flight. So the general term for these linear-acceleration–induced illusions is Somatogravic Illusions.