Computational neurosciences / neural theory
The Audition team is investigating the mechanisms of auditory perception, at the interface between low-level processing of acoustic features and high-level cognitive processes. We use a wide range of tools in order to address this research topic, from single unit recordings in behaving animals to advanced psychophysics and EEG in human subjects. Current projects in the lab revolve around three major threads:
Our brain needs to constantly fuse sensory information detected by our multiple senses in order to produce a seamless coherent representation of the world. Rather than being the exception, this binding process is ubiquitous to sensory-motor integration and is implicated in most cognitive functions. Its impairment is a cause of various pathologies, such as schizophrenia or autism. Multisensory processing operates on all brain levels from primary cortices over subcortical structures up to higher associative centers, while the smallest operational units are single multisensory neurons.
La maladie d'Alzheimer (MA) est un problème de santé publique dans nos sociétés. Elle est associée à l'accumulation intracérébrale de plaques amyloïdes et de protéines tau anormales. Notre équipe aborde cette maladie en se concentrant sur trois points différents.
Nous tentons de comprendre les mécanismes neuronaux de la perception à l'aide de modèles théoriques et informatiques des systèmes sensoriels. Ces modèles permettent de relier le niveau physiologique (les propriétés des neurones) et le niveau comportemental. Les théories sont ainsi testées à la fois par des expériences physiologiques (en particulier électrophysiologie) et comportementales (psychophysique). Elles sont également testées sous l'angle computationnel, en évaluant la performance fonctionnelle des modèles dans des tâches perceptives complexes.
The Ageing in Vision and Action team is a new research group created in 2014 at the Institute of Vision, Paris. It aims at gaining a better understanding of the perceptive and cognitive disturbances occurring with natural visual ageing in humans. Natural ageing of the visual system induces a complex pattern of perceptual, cognitive, and executive disturbances. The natural progressive degradation of visual functions in the elderly is the core subject of the Ageing in Vision and Action team.
Using the zebrafish larva as the experimental model and a multidisciplinary approach, including twophoton calcium imaging to monitor activity of neural networks, motor behaviours, genetic engineering techniques to label, monitor and manipulate activity of specific neurons or entire circuits and mathematical methods for data analysis, we are studying the following subjects:
1) Multimodal sensory perception:
Currently developping several research topics
1- Spike-based predictive coding:
The Team is specialized in integrative neuroscience. Using the barrel cortex of rodents as a system model, our research is centered on the study of neuronal processes responsible for the coding of tactile sensory information and perception, as well as their regulation through the interaction of the animal with the environment. We are interested in the propagation and integration of neuronal information in the primary somatosensory cortex and subcortical somatosensory relays, and the emergence of collective properties in response to spatially distributed stimuli on the receptor surface.
Memory is a dynamical phenomenon, from the moment of encoding to retrieval. As shown in the mammalian brain, after encoding labile memories undergo consolidation, that is, they stabilize over time first in the hippocampus before being transferred to the neocortex for long-term storage (Battaglia et al., 2011, Frankland and Bontempi, 2005). In 1989, Gyorgy Buzsaki proposed the twostage model of memory consolidation, where each sequential phase of memory (encoding and consolidation) is related to different internal brain states (Buzsaki, 1989).