Illusions of self-motion

Illusions of self-motion (or "vection") occur when one perceives bodily motion despite no movement taking place.

[2] There are also specific self-motion illusions that can occur through abnormal stimulation of various parts of the vestibular system, often encountered in aviation.

During linear vection, the observer feels like they have moved forwards or backwards and the stimulus has stayed stationary.

During roll vection, the observer feels like they have rotated around the line of sight and the disk has stayed stationary.

Subjects report a strong sense of self-rotation from stepping along a circular treadmill in the dark, which can be further enhanced through auditory cues.