Modes of electrical activities and energy of Hindmarsh–Rose model coupled by memristive synapses Franky Kevin Nando Tezoh, Adamou Dang Koko and H. P. Ekobena Fouda Eur. Phys. J. Plus, 138 3 (2023) 267 Published online: 23 March 2023 DOI: 10.1140/epjp/s13360-023-03887-5