Abstract
The use of spatio-temporal memory has been argued to increase food-finding efficiency in rainforest primates. However, the exact content of this memory is poorly known to date. This study investigated what specific information from previous feeding visits chimpanzees (Pan troglodytes verus), in Taï National Park, Côte d’Ivoire, take into account when they revisit the same feeding trees. By following five adult females for many consecutive days, we tested from what distance the females directed their travels towards previously visited feeding trees and how previous feeding experiences and fruit tree properties influenced this distance. To exclude the influence of sensory cues, the females’ approach distance was measured from their last significant change in travel direction until the moment they entered the tree’s maximum detection field. We found that chimpanzees travelled longer distances to trees at which they had previously made food grunts and had rejected fewer fruits compared to other trees. In addition, the results suggest that the chimpanzees were able to anticipate the amount of fruit that they would find in the trees. Overall, our findings are consistent with the hypothesis that chimpanzees act upon a retrieved memory of their last feeding experiences long before they revisit feeding trees, which would indicate a daily use of long-term prospective memory. Further, the results are consistent with the possibility that positive emotional experiences help to trigger prospective memory retrieval in forest areas that are further away and have fewer cues associated with revisited feeding trees.



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Acknowledgments
We thank the Leakey Foundation (the Franklin Mosher Baldwin Memorial Fellowship), the Max Planck Institute for Evolutionary Anthropology (MPI), the Centre Suisse de Recherches Scientifiques (CSRS) and the Taï Chimpanzee Project (TCP) for providing funding for this study. We thank the Office Ivorien des Parcs et Réserves (OIPR), the Direction du Parc National de Taï and the Ministère de la Recherche Scientifique en Côte d’Ivoire and the Université Félix Houphouët Boigny for their permission to execute this research and logistical support. We thank C. Stephens and R. Mundry for statistical support and for writing programs in R to calculate the approach distances as well to determine the complete interval of revisits. We thank C. Stephens for proofreading. We are grateful to A. N’Guessan for sharing his data on the energy value of the chimpanzee foods. We are grateful also to J. Tahou, L.B. Bally, V. Gnagnon, R. Nabo and A. Siablo for assistance in field data collection. This study is based on non-invasive observations and complies with the laws of Côte d’Ivoire.
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Ban, S.D., Boesch, C. & Janmaat, K.R.L. Taï chimpanzees anticipate revisiting high-valued fruit trees from further distances. Anim Cogn 17, 1353–1364 (2014). https://doi.org/10.1007/s10071-014-0771-y
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DOI: https://doi.org/10.1007/s10071-014-0771-y