Un modèle d'apprentissage multimodal pour un substrat distribué d'inspiration corticale

Abstract : The field of computational neurosciences is interested in modeling the cognitive functions through biologically-inspired, numerical models. In this thesis, we focus on learning in a multimodal context, ie the combination of several sensitive/motor modalities. Our model draws from the cerebral cortex, supposedly linked to multimodal integration in the brain, and modelize it on a mesoscopic scale with 2d maps of cortical columns and axonic projections between maps. To build our simulations, we propose a library to simplify the construction and evaluation of mesoscopic models. Our learning model is based on the BCM model (Bienenstock-Cooper-Munro), which offers a local, unsupervized, biologically plausible learning algorithm (one unit learns autonomously from its entries). We adapt this algorithm by introducing the notion of guided learning, a mean to bias the convergence to the benefit of a chosen stimuli. Then, we use this mecanism to establish correlated learning between several modalities. Thanks to correlated leanring, the selectivities acquired tend to account for the same phenomenon, perceived through different modalities. This is the basis for a coherent, multimodal representation of this phenomenon.
Document type :
Theses
Other. Université Henri Poincaré - Nancy I, 2010. French. <NNT : 2010NAN10092>


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Submitted on : Friday, December 17, 2010 - 7:39:31 PM
Last modification on : Monday, December 20, 2010 - 11:41:49 AM

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Thomas Girod. Un modèle d'apprentissage multimodal pour un substrat distribué d'inspiration corticale. Other. Université Henri Poincaré - Nancy I, 2010. French. <NNT : 2010NAN10092>. <tel-00547941>

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