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 "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."

Psychologically, the key to deciphering phantom vibrations is "hypothesis-guided search," a theory that describes the selective monitoring of physical sensations, says Jeffrey Janata, director of the behavioral medicine program at University Hospitals in Cleveland. It suggests that when cellphone users are alert to vibrations, they are likely to experience sporadic false alarms, he says.

"You come armed with this template that leads you to be attentive to sensations that represent a cellphone vibrating," Janata says. "And it leads you to over-incorporate non-vibratory sensations and attribute them to the idea that you're receiving a phone call."

Alejandro Lleras, a sensation and perception professor at the University of Illinois at Urbana-Champaign, adds that learning to detect rings and vibrations is part of a perceptual learning process.

"When we learn to respond to a cellphone, we're setting perceptual filters so that we can pick out that (ring or vibration), even under noisy conditions," Lleras says. "As the filter is created, it is imperfect, and false alarms will occur. Random noise is interpreted as a real signal, when in fact, it isn't."

Phantom cellphone vibrations also can be explained by neuroplasticity — the brain's ability to form new connections in response to changes in the environment.

When cellphone users regularly experience sensations, such as vibrating, their brains become wired to those sensations, Janata says.

"Neurological connections that have been used or formed by the sensation of vibrating are easily activated," he says. "They're over-solidified, and similar sensations are incorporated into that template. They become a habit of the brain."

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