Are the ticks caused by strong emotion?

Recently, I passed by my ex as I was walking down the church isle to receive communion. He, although not on purpose looked towards the isle and saw me. I did not exactly see his eyes on me, but I knew they were there. He turned around quickly afterwards. When it was his turn to get up and receive communion, he got up and his ticks started. He has a problem with ticks, which never bothered me because it never really happened often. After a minute, they stopped, but I was left wondering why they even started. I read somewhere that ticks are caused by strong emotion, and I wondered if that was true. If you wouldn't mind helping me out, can someone tell me if the ticks were caused by emotion, and why? I'll tell you that the only times I really saw the ticks was before we started dating, and that was often times when we were walking together.

Are the ticks caused by strong emotion?
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