Traveling-wave transcranial alternating current stimulation (twtACS) causally links neural timing to cognitive function - Sangjun Lee; Jimin Park; Ivan Alekseichuk; Taylor A. Berger; Ana M. G. Manea; Harry Tran; Gabriela Delgado Salazar; Seth D. König; Alexander B. Herman; David P. Darrow; Jan Zimmermann; Alexander Opitz (Proceedings of the National Academy of Sciences, 2026)