Jenna is a 20 year-old college student. A few months after joining her sorority, she began to develop symptoms of motor weakness and difficulties walking which would come on suddenly and ebb and flow in their severity. At times, she would also lose her voice and be unable to speak. She was referred to a neurologist who found that these symptoms were inconsistent with any recognized medical disorder. Jenna was highly concerned when she hear this news because she was not faking these symptoms and the symptoms were impaired her functioning in school and with her sorority. The neurologist will most likely diagnose Jenna with .