Der Meta-Affe – Von Affen, die wissen und Menschen, die wissen, dass sie wissen. Philosophical seminar, Bergische Universität Wuppertal, Germany, 2018.
Anthropomorphism or Anthropodenial – What should be the null-hypothesis in compa¬rative psychology? Presented at the Workshop ‘The Evolution of the Social Brain’, Forum Scientiarum, Universtity of Tuebingen, Germany, 2017.
Modern Approaches to Animal Cognition – Empirical Arguments and the Question of Parsimony. Presented at the 20th Conference of the European Society for Cognitive Psychology, Potsdam, Germany, 2017
Inferential reasoning in apes. Presented at the SPP Preparation Meeting (DFG) “Tool Choosing and Tool Using”, Cologne, Germany, 2017
Probabilistic judgments in chimpanzees. Presented at the 5th Workshop on Cognition and Evolution, Rovereto, Italy, 2016
Approaches to Animal Cognition: A Question of Truth or Taste? Presented at the Evidence for Animal Minds Meeting, Durham, UK, 2016.
Visual Illusion in Three Primate Species. Presented at the 6th Congress of the European Federation for Primatology, Rome, Italy, 2015.
Social Causality in Apes. Presented at the reunion workshop of the interdisciplinary research group ‘The Cultural Constitution of Causal Cognition’, Bergen, Norway, 2015.
Do Chimpanzees Understand Intentions Behind Behavior? Presented at the 25th International Primatology Society Congress, Hanoi, Vietnam, 2014
Causal Reasoning vs. Associative Learning in Animals - A Useful or a Strawman Dichotomy? Presented at the Animal Cognition Meeting , Gent, Belgium, 2013.
Chances and Challenges of Comparative Psychology. Presented at the Workshop “Exploring the Cultural Constitution of Causal Cognition: Theoretical Foundations and Empirical Approaches”, Bielefeld, 2013.
Das Menschliche Gehirn – Einzigartig? Panel Discussion at the BrainFair, ETH-Zürich, Switzerland, 2013.
Less is (sometimes) more – probabilistic judgment in chimpanzees. Presented at the 24th International Primatology Society Congress, Cancun, Mexico, 2012.
Causal Cognition in non-human primates. Presented at the “Netzwerktreffen” at the Center for Interdisciplinary Research (ZiF)”, Bielefeld, 2011.
Weight matters – Causal inference in Chimpanzees. Presented at the 23rd International Primatology Society Congress, Kyoto, Japan, 2010.
Visual Illusions in Great Apes. Presented at the 5th European Conference on Behavioural Biology, Ferrara, Italy, 2010.
Animal Cognition. Invited talk at the neuropsychological colloquium, University of Freiburg, Germany, 2010.
Great Apes Causal Cognition. Presented at the psychological colloquium, Humboldt University, Berlin Germany, 2009.
Contrasting the use of causal and arbitrary cues in chimpanzee problem solving. Presented at the 1st Workshop on Cognition and Evolution, Rovereto, Italy, 2009.
The Mueller-Lyersche and the Ebbinghaus illusion in chimpanzees, bonobos and orangutans. Presented at the 22nd International Primatology Society Congress, Edinburgh, UK, 2008.
Chimpanzees infer the location of a reward based on the effect of its weight. Presented at the 2nd Congress of the European Federation for Primatology, Prague, 2007.
Chimpanzees’ understanding of gravity. Presented at the international workshop on “The mind of the chimpanzee”, Chicago, USA, 2007.
Do peanuts float? Apes understanding of causality in a volume displacement task. Presented at the 21st International Primatology Society Congress, Entebbe, Uganda, 2006.
Numerical Abilities in Great Apes. Invited lecture at the University of Tokyo, Japan, 2005.
Quantity Based Discrimination in Great Apes (Pan paniscus, Pan troglodytes, Pongo pygmaeus, Gorilla gorilla). Presented at the 2nd International Workshop for Young Psychologists on Evolution and Development of Cognition, Kyoto, Japan, 2005.
Quantity Based Judgments by Orangutans, Gorillas and Bonobos. Presented at the 20th International Primatology Society Congress, Turin, Italy, 2004.