Lukas visited the labs of Andrej Bicanski and Christian Doeller at the Max Planck Institute for Human Cognitive and Brain Sciences in Leipzig. This enabled many exciting discussions with their lab members on cognitive maps, neural computations related to spatial navigation, and human ripples - especially with Fei Wang, Marit Petzka, Zhiming Jia, Yangwen Xu, Qiaoli Huang, Max Hinrichs, and Salma Elnagar. Many thanks for the invitation and the hospitality!