Phantom vibration syndrome or phantom ringing syndrome is the perception that one's mobile phone is vibrating or ringing when it is not. Other terms for this concept include ringxiety (a portmanteau of "ring" and "anxiety"), fauxcellarm (a portmanteau of "" /fo͜ʊ/ meaning "" or "" and "cellphone" and "alarm" pronounced similarly to "false alarm") and phonetom (a portmanteau of "phone" and "phantom"). According to Dr. Michael Rothberg, the term is not a syndrome, but is better characterised as a tactile hallucination since the brain perceives a sensation that is not actually present. WebMD published an article on phantom vibration syndrome with Rothberg as a source. Several other articles have been published in 2010s, including in NPR, Bustle, CBS News, and Psychology Today.