*Call for one experimental and one theoretical postdoctoral position in the framework of a collaborative (US/Spain) CRCNS project on the role of acetylcholine on memory.* The Wang lab at the Max Plack Florida Institute for Neuroscience, and the Computational Neuroscience group at the Centre de Recerca Matemàtica (Barcelona, Spain) are looking for postdoctoral researchers for an experimental-theoretical collaboration to shed light on the role of acetylcholine (ACh) in the formation and long-term dynamics of memory in rodents. This collaborative project will combine large-scale two-photon imaging recordings of in-vivo neuronal and ACh dynamics (Wang lab), with computational modeling and analysis (Roxin group) to investigate the role of ACh in the emergence of internally generated sequences in hippocampal CA1 cells. We will furthermore track the long-term dynamics of the resulting patterns of neuronal activity to characterize the degree of representational drift and elucidate the underlying mechanisms through network modeling. *Call for Experimental Postdoctoral Researcher*: The experimental postdoctoral position will be based at the Max Planck Florida Institute for Neuroscience, in the laboratory of Yingxue Wang.The ideal candidates should have a background in neuroscience or related field, and are interested in understanding the neuronal mechanisms of learning and memory. Previous experience with electrophysiology and/or two-photon imaging in behaving animals, quantitative data analysis and computer programming is highly preferred. Excellent communication skills and the ability to work well in a team are required. The three year project will begin immediately. Max Planck Florida Institute for Neuroscience is part of the Jupiter Neuroscience Research Campus which also includes UF Scripps Biomedical Research and Florida Atlantic University. It provides a flourishing interdisciplinary research environment for neuroscience. We offer outstanding benefits and salary compensation above the NIH scales. Interested candidates are encouraged to contact Yingxue Wang at Yingxue.Wang@mpfi.org. *Call for Theoretical Postdoctoral Researcher*: The theoretical postdoctoral position will be based at the Centre de Recerca Matemàtica, located on the campus of the Universitat Autònoma de Barcelona, Bellaterra, Spain. The postdoctoral researcher will combine the analysis of experimental data from the Wang Lab with computational modeling in order to study the physiological and network mechanisms underlying memory formation and representational drift. This work will involve large-scale numerical simulation as well as network analysis using methods from dynamical systems theory and statistical physics. Strong coding and mathematical skills are a must. This is a three-year position which is expected to begin in early 2024. Interested candidates should contact Alex Roxin at alexander.roxin@gmail.com. This project is jointly funded by the National Institutes of Health (USA) and the Agencia Estatal de Investigación (Spain) in the framework of Collaborative Research in Computational Neuroscience program (CRCNS). As such, the experimental and theoretical teams will work closely together, including regular online meetings and an annual in-person meeting to be held alternatingly in Florida and Barcelona. The postdoctoral researchers will be expected to work in a collaborative fashion with members of both teams to ensure a unified research effort. -- Alex Roxin Computational Neuroscience Group Centre de Recerca Matemàtica Campus de Bellaterra, Edifici C 08193 Bellaterra (Barcelona) https://sites.google.com/site/alexanderroxin/home