Academic Education
12/2016 - 05/2020	Ph.D. studies at the Institute for Neuro- and Behavioural Biology, University of Münster
10/2013 - 08/2016	Master of Science in Biosciences, University of Münster
10/2010 - 09/2013	Bachelor of Sciene in Biosciences, University of Münster
Work Experience
since 06/2020	Postdoctoral researcher at the Department of Behavioural Biology, University of Münster
12/2016 - 05/2020	PhD student at the Department of Behavioural Biology, University of Münster

Publications

Effects of enrichment removal on cognitive judgement bias of mice: a comparison of two paradigms Siewert V, Bierbaum L, Gleske M, Mundinger C, Palme R, Kaiser S, Sachser N, Richter SH (2026) In: Frontiers in Veterinary Science, 13, 1813283. doi:10.3389/fvets.2026.1813283 Research article (journal) \| Peer reviewed \| Published
The behavioural ecology of optimism: judgement bias and foraging under predation risk in mice Bračić M, Bierbaum L, Peng M, Nimalavachchlan L, Siewert V, Kaiser S, Sachser N, Richter SH (2025) In: Animal Behaviour, 219, 122991. doi:10.1016/j.anbehav.2024.10.005 Research article (journal) \| Peer reviewed \| Published
Optimism and pessimism: a concept for behavioural ecology Siewert V, Kaiser S, Sachser N, Richter SH (2025) In: Biological reviews, 100, 1152-1162. doi:10.1111/brv.13178 Research article (journal) \| Peer reviewed \| Published
Forever an optimist? Investigating the temporal consistency of optimism within and across life phases in rats Bierbaum L, Mundinger C, Siewert S, Kaiser S, Richter SH (2025) In: Animal Behaviour, 229, 123334. doi:10.1016/j.anbehav.2025.123334 Research article (journal) \| Peer reviewed \| Published
The power of a touch: Regular touchscreen training but not its termination affects hormones and behavior in mice Quante, SM; Siewert, V; Palme, R; Kaiser, S; Sachser, N; Richter SH (2023) In: Frontiers in Behavioral Neuroscience, 17. doi:10.3389/fnbeh.2023.1112780 Research article (journal) \| Peer reviewed \| Published

Effects of enrichment removal on cognitive judgement bias of mice: a comparison of two paradigms Siewert V, Bierbaum L, Gleske M, Mundinger C, Palme R, Kaiser S, Sachser N, Richter SH (2026) In: Frontiers in Veterinary Science, 13, 1813283. doi:10.3389/fvets.2026.1813283 Research article (journal) \| Peer reviewed \| Published
The behavioural ecology of optimism: judgement bias and foraging under predation risk in mice Bračić M, Bierbaum L, Peng M, Nimalavachchlan L, Siewert V, Kaiser S, Sachser N, Richter SH (2025) In: Animal Behaviour, 219, 122991. doi:10.1016/j.anbehav.2024.10.005 Research article (journal) \| Peer reviewed \| Published
Optimism and pessimism: a concept for behavioural ecology Siewert V, Kaiser S, Sachser N, Richter SH (2025) In: Biological reviews, 100, 1152-1162. doi:10.1111/brv.13178 Research article (journal) \| Peer reviewed \| Published
Forever an optimist? Investigating the temporal consistency of optimism within and across life phases in rats Bierbaum L, Mundinger C, Siewert S, Kaiser S, Richter SH (2025) In: Animal Behaviour, 229, 123334. doi:10.1016/j.anbehav.2025.123334 Research article (journal) \| Peer reviewed \| Published
The power of a touch: Regular touchscreen training but not its termination affects hormones and behavior in mice Quante, SM; Siewert, V; Palme, R; Kaiser, S; Sachser, N; Richter SH (2023) In: Frontiers in Behavioral Neuroscience, 17. doi:10.3389/fnbeh.2023.1112780 Research article (journal) \| Peer reviewed \| Published