Astronauts experience similar feelings of dizziness and disorientation upon arrival in space and upon their arrival back on Earth. What does this indicate to researchers?

Astronauts feel disoriented when they first enter space, then experience similar feelings when they return to Earth. This suggests their vestibular sense adjusts to the new conditions in space, and must adjust again when they return to Earth. That ability to adjust to ongoing changes in sensory input is called sensory adaptation, so the correct choice is “The vestibular sense may be capable of sensory adaptation.”

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