Final answer:
The two types of vestibular illusion are somatosensory illusions and visually induced illusions, which result from conflicts between the vestibular system and other sensory inputs.
Step-by-step explanation:
The two types of vestibular illusion are somatosensory illusions and visually induced illusions. These illusions can arise when there is a discrepancy between the sensory input and the way the brain interprets this information. Somatosensory illusions are related to the sense of the position and movement of our body parts and often occur when the information from the vestibular system conflicts with the sensory feedback from the muscles and joints. Visually induced illusions, on the other hand, are those where visual perception conflicts with vestibular information; this often occurs when there is a large field of visual motion that is at odds with vestibular input, such as when watching a moving scene while stationary.
The vestibular system, including parts like the utricle, saccule, and semicircular canals, is primarily responsible for detecting head movement and orientation. When there is an issue with the vestibular system or a disconnect between the various sensory systems, vestibular illusions can occur, sometimes resulting in symptoms like dizziness or balance problems. For instance, the perceived motion when sitting in a stationary car as an adjacent car moves can create the illusion of self-movement due to conflicting visual and vestibular cues.