Which of the following is classified as a type of somatogyral illusion?

The Leans is classified as a type of somatogyral illusion because it specifically involves the perception of rotation due to the effects of motion on the vestibular system, which is responsible for our sense of balance and spatial orientation. In this illusion, an individual misinterprets their body's position or motion when subjected to certain accelerative forces, particularly during roll movements in flight. When a pilot experiences a sudden maneuver, they may incorrectly sense a return to an upright position even when the aircraft is still in a roll, leading to uncoordinated corrections.

Understanding the concept of somatogyral illusions is essential as it highlights how the body can misinterpret sensory information in dynamic environments, particularly in aviation. This misperception can lead to dangerous situations if the pilot relies solely on their distorted sense of orientation rather than adhering to instruments or visual cues.

The other options, while related to spatial perceptions and illusions, do not fall under the category of somatogyral illusions. The concepts associated with G-Excess Effect and spatial disorientation involve different aspects of how pilot physiology interacts with movement and sensory input, but they do not specifically relate to the misinterpretation of rotational motion in the same way that The Leans does.