Brain stimulation in zero gravity: transcranial magnetic stimulation (TMS) motor threshold decreases during zero gravity induced by parabolic flight. - Badran BW; Caulfield KA; Cox C; Lopez JW; Borckardt JJ; DeVries WH; Summers P; Kerns S; Hanlon CA; McTeague LM; George MS; Roberts DR (NPJ microgravity, 2020)