Reproducing sensory induced visual hallucinations via neural fields
Dario Prandi (CNRS, L2S, CentraleSupélec)
Mercredi 25 mai 2022, 11:00, salle Coriolis (Galois).
Abstract. Understanding the interaction between retinal stimulation and the cortical response in the primary visual cortex (V1 for short) is a significant challenge in improving our insight into human perception and visual organisation. In this talk we will present recent work on the reproduction of various visual illusions via mathematical models. In particular, we will present recent results in collaboration with Y. Chitour and C. Tamekue on the modelling via Wilson-Cowan equations of Mackay-type effects (i.e., phantom images induced by geometric patterns).
In a second part of the talk, we will present a variational alternative to this model (the Local Histogram Equalization) that, exploiting the Citti-Petitot-Sarti model of V1, allows to describe assimilation and contrast visual bias at the same time. Notably, this allows for the reproduction of orientation-dependent phenomena such as the Poggendorff illusion. This last part is a joint work with E. Baspinar, M. Bertalmio, L. Calatroni, V. Franceschi, and A. Gomez-Villa.