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Searching in Complex environments

le 5 avril 2016 à 11 h
Jean-Baptiste Masson, Institut Pasteur, Physics of Biological Systems, Paris

Most motile organisms have to navigate in complex varying environments to nd food, locate mates and escape
predators. The quality of sensing and response to external stimuli constitutes a basic element in the selective per-
formance of living organisms. Search strategies have to match the environments statistical properties while being
computable by the organism.
We will discuss search strategies at 3 scales : µm → mm with E.coli, mm → cm with drosophila larval and
cm → m with both Red Palm Weevil and robotic searches. We will show chemotaxis in microfluidically controlled
chemical elds and discuss chemtactic lters properties. We will discuss drosphila larvae dynamical behaviour in
virtual environments. We will combine live behaviour classi cation with optogenetic neural activation (chrimson)s to
test larval decision making. We will discuss similarities with bacterial chemotactic strategies and also show how to
play multi-arm bandit game with larvae. We will especially focus on an interesting asymmetry in escape strategy.
Finally, we will discuss searching in turbulent environments with limited space perception. We will show how to record
odour path on insects trajectories and discuss the unexpected walking strategy of the red palm Weevil in response to
its gathering pheromone.

Lieu(x) :         Amphithéatre Pierre Curie, Ecole Polytechnique


Contact :       Antigoni Alexandrou
                      antigoni.alexandrou at polytechnique.edu


À télécharger :       Séminaire MASSON - PDF