Which of the following symptoms can indicate motion sickness in a pilot?

Nausea is a key symptom of motion sickness, which occurs when there is a conflict between the sensory signals received by the brain. When flying, the pilot's vestibular system (responsible for balance and spatial orientation) may detect movement that does not match the visual cues being observed, leading to discomfort and nausea. This physiological response is a reaction to the dissonance between what the inner ear senses and what the eyes see, emphasizing how critical it is for pilots to recognize motion sickness symptoms to maintain safety and ensure effective functioning in the cockpit.

The other symptoms mentioned, such as increased energy levels, heightened cognitive function, and improved depth perception, do not align with the physiological effects of motion sickness. Instead, these would typically be considered positive cognitive states, which are contrary to the feelings of discomfort and distress experienced during motion sickness. Recognizing nausea and addressing it is crucial for pilots to prevent impairment during flight operations.