1 . Motion sickness is an uncomfortable feeling. The sickness it causes can strike people on an airplane, playing video games, or, commonly, when riding in a car. In a future where people may find themselves running around streets in self-driving vehicles, the problems could get worse.
We typically sense our physical position and movement in the world by relying on our eyes, the feeling we get in our body, and our inner ear. Motion sickness may develop when there's disagreement between what your eyes see and what your inner ear senses. If you're looking at your phone in a moving vehicle, your eyes see a stationary screen but your inner ear feels that you're moving. The result of that dissonance can cause sickness. The common-sense solution is to just stop looking at your phone, but some of the appeal of self-driving cars is that you could use the time to be productive or entertained by what's on a screen.
Researchers of a car-making company and a video game company have been studying ways to address these issues. And their solution uses an interesting medium: sound. The research had two goals: to explore if sound could help relieve motion sickness, and to help people trust self-driving cars more. They experimented with two different categories of sound: tips that tell passengers what's about to happen, and noises that alert passengers when the device has noticed something, like a pedestrian.
The most convincing experiment took place on a closed airport runway in Sweden, near Gothenburg, in August of last year. On that track, brave participants had to ride in the backseat of a car driven by a human and read from a tablet while the car navigated the course. With just 20 people, the study was small, but according to researchers, the presence of sound tips made people report that they felt less ill. Participants said the sounds helped prepare them physically, or adjust their bodies for what was about to happen.
1. When does motion sickness usually happen?| A．Sleeping during travels. | B．Closing eyes on vehicles. |
| C．Driving vehicles speedily. | D．Riding in moving vehicles. |
| A．Confusion. | B．Potentiality. | C．Randomness. | D．Disagreement. |
| A．Uncertain. | B．Optimistic. | C．Concerned. | D．Dissatisfaction. |
| A．A study of motion sickness. | B．Self-driving vehicles. |
| C．A convincing experiment. | D．The cause and handling of motion sickness. |
