Computational Vision & Neuroscience Group

Using methods of statistical inference and learning theory, as well as signal processing, nonlinear dynamics and optimization theory, our research addresses the problem of perceptual inference from natural images and its neural basis at different levels:

• We develop mathematical generative models of natural images and image transformations using unsupervised learning methods. Particular emphasis is placed on quantitative comparisons of the performance of these models.
• We perform psychophysical studies in order to evaluate the relationship between natural image models and perception.
• We develop new efficient methods to predict the spike trains of neurons in response to natural stimuli with the goal of inferring the contribution of these neurons to the image processing performed in the early visual system. In particular, we build population response models for multi-cell recordings and we address the aspects of contrast adaptation, non-Gaussian stimuli, and inter-spike correlations.