Actually, you have NO proof. From what I've heard, it's mor of a luck of the draw. It can get better or worse with age. You even said that yours had it after you got it, proving this.
You are also EXTREMELY underestimating the power and potential of animals' brains. There are multiple factors being affected in the brain to cause the spider problems. You can't just 'breed down' an animal with neurological affects, without expecting it to also affect something you didn't think could happen.
You can't breed animals into specific brain functions. It's not that simple. You can't breed a ball python to learn how to go through a maze. Brain function is too delicate and intricate.









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