Some call it "phantom vibration syndrome." Others prefer "vibranxiety" — the feeling when you answer your vibrating cellphone, only to find it never vibrated at all.
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R. Amant, T. Horton, and F. Ritter. CHI '04: Proceedings of the SIGCHI conference on Human factors in computing systems, page 343-350. New York, NY, USA, ACM Press, (2004)