PhD Title: Development of appetitive conditionings and analysis of individual and group memory performances in appetitive and aversive contexts in Drosophila sp.
Summary: The fruit fly Drosophila is commonly employed as an experimental model to study memory, with an aversive conditioning, using flies in group. To compare memory processes in aversive and appetitive contexts, we developed two olfactory appetitive conditionings, of proboscis activity with fruit flies in contention, and of olfactory preference in group. Both induce associative learnings, dependent of food motivation. The first one, innovative, uses flies in contention with the perspective of in vivo imaging of neuronal activity. The second produces long term appetitive memory, formed by potentially different processes than those of the aversive memory, and which are currently investigated. These achievements offer the perspective to approach experimentally motivational regulation processes of memory. Then, by a comparative analysis of individual and group performances of the aversive memory, we found differences in individual behaviours between two forms of aversive consolidated memories known in Drosophila, the “long term memory” and the “anaesthesia resistant memory” (ARM), and social facilitation of ARM performance, of which mechanisms are being studied. These results and a review of social behaviours in Drosophila bring elements allowing considering Drosophila as species with a certain sociality, to include in investigations of the evolution of sociality.