Development and Evolution of Cognition
What we study
The evolution of high-level cognition remains one of the biggest unsolved questions in Evolutionary Biology. Cognition is selected for by cognitive skills and abilities which provide fitness benefits. However, interestingly, the larger brained a species is, the more incompetent individuals are at birth and the more they must learn to become fully functioning adults. This means that the larger brained and thus cognitively advanced a species is, the more its cognitive skills and abilities depend on developmental inputs. This phenomenon remains poorly understood and is the key focus of the Development and Evolution of Cognition Group. Our research aims at understanding how cognitive skills and abilities develop in individuals, to better understand cognitive evolution.
Orangutans as our main study species
Our current main research focus lies on the development of different aspects of cognitive performance, ecological skills, and cultural repertoires in immature Sumatran orangutans (Pongo abelii). We are particularly interested in how social and environmental factors affect the development of these different aspects of cognition. Orangutans have the slowest development of any non-human primate species, high cognitive abilities, and rely on many complex ecological skills. Furthermore, orangutans show a very variable social system ranging from semi-solitary to fission fusion with varying levels of social tolerance. These factors make orangutans especially interesting and suitable for our research. Through the SUAQ project, we are following a group of immature orangutans with their mothers and other association partners in the Suaq Balimbing forest in South Aceh, Indonesia.
Other species and phylogenetic analyses
To understand developmental patterns on the evolutionary level, our research is also heavily based on comparisons with other orangutan populations and species, as well as comparisons with other great ape species. Furthermore, to fully understand the evolution of higher-level cognition it is crucial to look across a wider variety of taxa. Therefore, we also investigate broader patterns between cognition, life history traits, social system, and ecological factors across a wide range of mammal and bird species. For this we use large datasets and a variety of different comparative approaches.
Ongoing and about to be started research projects
Over the past 10 years, we have studied the development of behavioral measures of orangutan cognitive performance and their social and ecological correlates. We recently also developed a test battery to measure cognitive performance in wild orangutans experimentally. These tests will measure multiple aspects of cognitive performance. We aim to correlate individuals’ cognitive performance with their developmental histories in terms of their past social experiences and the environmental conditions during different periods of their development. We will also investigate how cognitive performance translates into sets of learned skills and fitness parameters.
A PhD position in the frame of the Development of Orangutan Cognitive Performance project will be advertised here in 2021. We will also have spots available for MSc student fieldwork-based subprojects.
One of the major challenges that juvenile orangutans face when the start leaving their mothers is learning where and when they can find food. This project investigates different aspects of the development of ranging competence, including cognitive maps, planning and decision making in daily movement trajectories. Analyzing how individuals learn to navigate through their home ranges in terms of optimizing food intake, travel distances and nest locations, will provide further insight into orangutan cognition. For this project, we rely on long-term ranging, behavioral and environmental data that have been collected at Suaq Balimbing since the 1990ties, and recently collected nutritional data.
The Orangutan Ranging Skill Development project will be conducted in the frame of a PhD project. We will also have spots available for MSc student fieldwork-based subprojects.
Our previous work showed that orangutans acquire most of their ecological skills through a combination of social learning and socially induced independent practice. After establishing the basic patterns and compiling an extensive cross-sectional and longitudinal data set on measures of social learning, we can now start looking into the details of the development of social learning. This includes immatures’ choice of role models and changes in learning content as a function of different factors. We are also looking into the role of behavioral adjustments of the mother in the skill acquisition of her offspring.
Currently, these topics are investigated in the frame of different MSc theses for which we will be looking for new students in 2021. These projects can include field work or can be entirely based on already collected data.
The long-distance dispersal of male orangutans may be one way through which behavioral repertoires are being spread throughout the population. With this project we investigate the behavioral strategies individuals use to cope with the challenges of and at the same time make use of the benefits of migration. Our goal is to examine how informational and social benefits drawn from cultural transmission between foreigners affect individuals` survival and integration into the host community. The project aims to shed light on which factors influenced cultural exchange, tolerance, and xenophobia during human evolution.This project is currently conducted in the frame of the PhD project of Julia Mörchen at Leipzig University and the Max Planck Institute for Evolutionary Anthropology and several MSc projects. It is based on a collaboration between Dr. Caroline Schuppli, Prof. Dr. Michael Krützen from the University of Zürich and Prof. Dr. Anja Widig from Leipzig University and the Max-Planck Institute for Evolutionary Anthropology.