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Thanks for taking the time to look further into motion sickness and posting your findings for us all to share, Jackie.

I agree with you when you say suggest that "the sense of sickness decreases if the activity becomes less passive". While I've never felt motion sickness in a car, my best friend Jayme has terrible motion sickness whenever she's a passenger. I find it interesting that when Jayme is the one driving the car, she doesn't experience motion sickness at all. The concentration required to drive the car, and looking ahead and toward the horizon is also known to aid motion sickness, so I suppose this helps correct the discreptancy between the corollary discharge signals and input to the nervous system.

(An aside that I found interesting: dogs are also capable of experiencing motion sickness. :)