Searching in the Middle—Capuchins’ (Cebus apella) and Bonobos’ (Pan paniscus) Behavior During a Spatial Search Task
Publication Type: |
Journal Article |
Year of Publication: |
2010 |
Authors: |
P. Potì, P. Kanngiesser, M. Saporiti, A. Amiconi, B. Bläsing, J. Call |
Publication/Journal: |
Journal of Experimental Psychology: Animal Behavior Processes |
Keywords: |
bonobos, capuchins, landmark configuration, middle rule, vector averaging |
ISBN: |
1939-2184 0097-7403 |
Abstract:
In this study we show that bonobos and capuchin monkeys can learn to search in the middle of a landmark configuration in a small-scale space. Five bonobos (Pan paniscus) and 2 capuchin monkeys (Cebus apella) were tested in a series of experiments with the expansion test paradigm. The primates were trained to search in the middle of a 4- or 2-landmark configuration, and were then tested with the same configuration expanded. Neither species searched in the middle of the expanded 4-landmark configuration. When presented with a 2-landmark configuration and a constant or variable inter-landmark training distance, the subjects sometimes searched preferentially in the middle of the expanded configuration. We discuss 2 alternative explanations of the results: extracting a middle rule or averaging between different goal-landmark vectors. In any case, compared to adult humans, primates appear highly constrained in their abilities to search in the middle of a configuration of detached landmarks. We discuss some of the factors that may influence the primates’ behavior in this task.