Which of the following symptoms is NOT associated with motion sickness?

The correct choice focuses on blurred vision as a symptom not typically classified under the common indicators of motion sickness. Motion sickness generally encompasses symptoms that stem from a conflict between the sensory signals the brain receives, particularly between the inner ear, eyes, and deeper body parts that inform orientation and balance.

Common symptoms of motion sickness include general discomfort, dizziness, and vomiting. General discomfort relates to an unease that often accompanies bouts of motion sickness, while dizziness can manifest due to the disturbance in balance and spatial orientation. Vomiting is a more extreme response and is generally associated with the body's reaction to the signals received during motion.

In contrast, while blurred vision can occur during episodes of motion sickness due to the brain's overall response to disorientation, it is not one of the more widely recognized or reported symptoms. Thus, it stands out as the symptom least closely associated with typical cases of motion sickness, making it the correct answer in this context.