Which strategy is effective in treating motion sickness?

Avoiding head movements is an effective strategy in treating motion sickness because sudden or excessive movement can exacerbate the sensory conflict that leads to the symptoms of motion sickness. When the vestibular system (responsible for balance) is disrupted by motion that is not consistent with visual input, it can cause nausea and discomfort. By minimizing head movements, the brain receives more stable sensory input, which can help alleviate the feelings of sickness.

In contrast, other strategies such as consuming a heavy meal before traveling can actually increase the likelihood of motion sickness, as a full stomach can add to the discomfort. Closing all air vents is unlikely to have a beneficial effect on stabilizing cabin pressure or mitigating motion sickness; instead, accessing fresh air can help some individuals feel better. Increasing the speed of travel would likely intensify the sensations that cause motion sickness rather than alleviate them.