LGI1 and Cognitive impairment: It is described as brief, very frequent (50 times a day on average) involuntary movements of the arm and ipsilateral face often associated with loss of consciousness, and has also been known to precede cognitive impairment in anti‐LGI1 patients by a considerable duration (median lag of 36 days; Andrade, Tai, Dalmau, & Wennberg, 2011; Irani et al., 2008, 2011, 2013).