The principle of motion sickness is:
Motion sickness, also known as motion sickness, is a general term for motion sickness, seasickness, airsickness, etc. It refers to a group of symptoms such as cold sweats, nausea, vomiting, dizziness and other symptoms that occur when the vestibular balance receptors in the human inner ear are stimulated by excessive movement when riding in vehicles, and the vestibular organs produce excessive bioelectricity, which affects the nerve center.
The vestibular organ of the inner ear is the body's balance receptor. It includes three pairs of semicircular canals and the oval and saccule of the vestibule. There is an ampullar ridge in the semicircular canals and an otolith organ (also called a sac) in the oval saccule. They are both vestibular terminal receptors that can sense the stimulation of various specific motion states. The semicircular canals sense angular acceleration (deceleration) velocity motion stimulation, while the oval sac and saccule vesicles sense changes in horizontal or vertical linear acceleration (deceleration) velocity.
When the vehicle we ride rotates or turns (such as a car turning, an airplane making a circular motion), angular acceleration acts on the corresponding semicircular canals of both sides of the inner ear. When the hair cells in the ampulla of the semicircular canal on one side When stimulated, the bending deformation generates a positive potential. At the same time, the hair cells on the contralateral side bend and deform to generate an opposite potential (negative electric potential). The excitatory or inhibitory electrical signals of these nerve endings are transmitted to the vestibular center through the nerves and sense the motion state; similarly, when riding When tools undergo linear acceleration (deceleration) changes, such as when a car starts, accelerates, decelerates, brakes, ships rock, bump, elevators and planes rise and fall, these stimuli cause the follicular hair cells of the vestibular oval sac and saccule to produce deformation discharges, which move towards the central nervous system. convey and perceive.
People will not have adverse reactions to the generation and transmission of these vestibular electrical signals within a certain limit and time, but everyone has a limit to the intensity and time of these stimulations, and this limit is the cause Halo threshold, if the stimulation exceeds this limit, symptoms of motion sickness will appear.
Each person’s tolerance varies greatly. In addition to genetic factors, this is also affected by factors such as vision, individual physique, mental state, and objective environment (such as air odor). Therefore, in the same environment Under objective conditions, only some people experience symptoms of motion sickness.