Editorial on the special issue on brain physiology meets complex systems Oxana Semyachkina-Glushkovskaya, Alexey Pavlov, Anatoly Karavaev, Thomas Penzel and Teemu Myllylä Eur. Phys. J. Spec. Top., 232 5 (2023) 469-473 Published online: 17 April 2023 DOI: 10.1140/epjs/s11734-023-00828-2