Astronauts who experience weightlessness frequently get motion sickness. The astronauts see their own motion relativ...

Jay-Etter on January 23, 2022

Hi Josabeth,
Happy to help! Let's break down the argument.
Conclusion: The astronauts' experience is best explained by the hypothesis that conflicting information received by the brain about the body's motion causes motion sickness.
Why? Because their inner ears indicate not moving and their vision indicates moving.

Option A is telling us that when the inner ears (experience of rough voyages) matches up with the vision (seeing view of water) passengers are less likely to get motion sickness compared to when they have inner ears but no vision. In other words, when the signals to the brain match up motion sickness is less likely, and when they differ motion sickness is more likely. This exactly matches up with the stimulus!

Option C is telling us sometimes even when the inner ears and the brain match up, people still get motion sickness. This doesn't help because we're trying to say the cause of motion sickness is differing signals to the brain. If anything, this would weaken the argument because it's indicating something other than differing signals to the brain causes motion sickness.