During the initial stages of post-natal development, the nervous system begins receiving tremendous amounts of sensory stimuli from the outside world. Yet, even without any prior exposure to them, the brain is capable of efficiently processing information from early ages. How can the brain be prepared for this function? Spontaneous electrical activity in previous stages of development, mainly embryonic, might guide the nervous system to establish the initial functional neural circuits. Whereas the brain remains isolated from environmental stimulation, patterns of electrical activity provide form to these proto-networks with the objective that, upon birth or during the weeks following, a newborn rapidly begins assimilating images, sounds, smells. Our group's objective is to examine the spontaneous electrical activity during embryonic stages and shortly after birth, and seek answers to how it is related to the functioning of mature neural networks. In addition to the cerebral cortex, our group analyzes functions of the thalamus, a key structure in the transfer of information from the periphery to central processing circuits. Understanding these bases enables addressing the following objective, which consists in explaining the sensory plasticity observed in individuals with deficits in some sensory modalities. Our experimental approach consists in acquiring electrical and image records in the thalamus and cerebral cortex during embryonic and post-natal ages in control mice deprived of some sensory pathway. To conduct these experiments, investigators possessing high levels of technical knowledge of the recording equipment are necessary because these are not standard experiments and thus require the incorporation of in-house designed components. Furthermore, to analyze the compiled data, the group aims to develop computing tools adapted to the experiments.