Motion sickness: an evolutionary and genetic basis for the negative reinforcement model.

Abstract excerpt

It has been theorized that motion sickness evolved as a negative reinforcement system which terminates motion involving postural instability and/or sensory conflict. A hypothetical example is provided by a "thought experiment" whereby protohominids are in a tree looking for food. Selection pressure results when the organisms that have an aversion to motion-producing sensory conflict do not venture out too far on...

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