Pattern formation induced by gradient field coupling in bi-layer neuronal networks Yong Wu, Qianming Ding, Dong Yu, Tianyu Li and Ya Jia Eur. Phys. J. Spec. Top., 231 22-23 (2022) 4077-4088 Published online: 06 July 2022 DOI: 10.1140/epjs/s11734-022-00628-0