Abstract
In a constantly changing environment, it is advantageous for animals to encode a location (such as a food source) relying on more than one single cue. A certain position might, in fact, be signalled by the presence of information acquired through different sensory modalities which may be integrated into cohesive memories. Here, we aimed to investigate multi-sensory learning capabilities and multi-modal information integration in Lasius niger ants. Individual ants were placed in a Y-maze where odour information always led to a food reward; moreover, arm and wall colour were also predictive but only when co-occurring with odour in a specific combination. At test, the odour cue was made uninformative (it was present in both arms). Ants were still able to correctly locate the reward by integrating odour with the right colour and side combination. In a second experiment, we tested whether multi-modal cue integration can take place in a single trial. To this end, ants were exposed to a rewarded odour in a single-arm maze and could experience the Y-maze (with all available cues) only once. At test (which was identical to that of Experiment 1), ants showed a slight preference for the correct colour-side combination, although not significantly different from chance level. Our results showed the capability of black garden ants to code apparently redundant contextual information and to create and rely on conditional relationships between the information available. We argue that future studies should deepen the inquiry on the timing and progression of multi-modal cue learning.
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Funding
The experiment was carried out in partial fulfilment of MDA doctoral project. FBO was funded by a DFG Emmy Noether grant to Tomer J. Czaczkes (Grant no. CZ 237/1-1).
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De Agrò, M., Oberhauser, F.B., Loconsole, M. et al. Multi-modal cue integration in the black garden ant. Anim Cogn 23, 1119–1127 (2020). https://doi.org/10.1007/s10071-020-01360-9
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DOI: https://doi.org/10.1007/s10071-020-01360-9