What is one example of a somatogravic illusion?

The pitch up/down illusion is an example of a somatogravic illusion because it occurs when the pilot misinterprets the body's acceleration forces during pitch maneuvers. This particular illusion arises from the body's vestibular system, which can mistake the sensation of rapid changes in acceleration for an actual change in altitude or orientation.

When an aircraft experiences an increase in pitch, the sensation of being pushed back into the seat might induce a belief that the aircraft is climbing, even if it is not. Conversely, during a rapid descent, the sensation of weightlessness can lead to the incorrect perception that the aircraft is in a nose-up attitude, creating confusion about the actual flight path. Understanding this illusion is crucial for pilots, as it can significantly impact their decision-making and response during flight.

In contrast, other illusions such as the Coriolis illusion, The Leans, and Graveyard Spin involve different mechanisms or contexts of misinterpretation related to motion and orientation but do not specifically align with the characteristics defined under somatogravic illusions.