Maybe I am misunderstanding Colin's post, but the way I read it he is saying that the "tick" in any animal, be it jag or normal, is not genetic in nature but just something that is brought about by some kind of stress.

Paraphrasing Colin above:

they do not have any genetically passed expressed neurological conditions. any snake can act like that if... it has nothing to do with the jag gene
(Colin please correct me if I am reading your post wrong.)

If that is the case then it begs the question of, why is there a disproportionatly high number of jag with "ticks" vs. normals? To see that disproportion would mean, if the condition had no genetic link and is merely the result of a "stress", that more jags than normals are being exposed to said stress. I am not saying that jag owners are intentionally causing the stress, just that more jags than normals are being exposed to whatever stress it is that causes the condition. And I find it hard to believe that serious keepers, like the ones who invested high dollars into jags in the early years, would even accidentally allow their jags to encounter a stress event of that magnitude.