Comparison of reactive and cognitive search strategies N Voges1, A Montagnini2, D Martinez1 |
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1UMR 7503, LORIA / CNRS, France |
| Reactive searching is controlled by current perceptions that activate pre-programmed movements: e.g. pheromone-seeking male moths surge upwind towards the source whenever detecting an odor while crosswind casting otherwise [Kaissling, 1997, in: Orientation and Communication in Arthropods, M Lehrer, Birkhaeuser Verlag, Basel; Martinez et al, 2013, Plos One, accepted]. Similarly, a salient visual stimulus evokes a reflexive saccade towards it. Cognitive searching uses Bayesian inference to build a spatial probability map based on the gathered information. Cognitive strategies were applied for visual [Najemnik & Geisler, 2008, J Vision 8(3):1] and olfactory [Infotaxis: Vergassola et al, 2007, Nature 445:406] searches. Comparing reactive and cognitive search strategies in a confined spatial region using a pheromone-seeking cyborg we find that computationally less expensive reactive strategies are nonetheless quite efficient. Cognitive olfactory search trajectories are simulated using Infotaxis. A variation thereof with a localized blinking light as visual stimulus is suggested to represent search trajectories of eye movements. Assuming that cognitive strategies in both modalities are optimized with respect to maximizing the information gain, we investigate the differences for visual versus olfactory stimulation. |
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