DESTEXHE , Alain

The presence of self-organized criticality in biology is often evidenced by a power-law scaling of event size distributions, which can be measured by linear regression on logarithmic axes. We show here that such a procedure does not necessarily mean that the system exhibits self-organized criticality. We first provide an analysis of multisite...

When processing a moving object, the visual system uses several anticipation mechanisms to compensate the delay induced by the photo-transduction [1,2]. On one hand, retinal gain control advances the peak in sensory cells response. On the other hand, due to the lateral connectivity, the activity begins to raise before the moving stimulus enters...

When processing a moving object, the visual system uses several anticipation mechanisms to compensate the delay induced by the photo-transduction [1,2]. On one hand, retinal gain control advances the peak in sensory cells response. On the other hand, due to the lateral connectivity, the activity begins to raise before the moving stimulus enters...

When processing a moving object, the visual system uses several anticipation mechanisms to compensate the delay induced by the photo-transduction. On one hand, retinal gain control advances the peak in sensory cells response. On the other hand, due to the lateral connectivity, the activity begins to raise before the moving stimulus enters in...

We study motion anticipation in a mean field model of the primary visual cortex (V1) with a realisticretinal input. We assess the ability of this integrated retino-cortical model to reproduce experimentalresults on voltage dye optical imaging (VSDI) signal, in terms of two main quantities used to quantifyanticipation: the latency and the time...

International audience

International audience

Many neurons possess dendrites enriched with sodium channels and are capable of generating action potentials. However, the role of dendritic sodium spikes remain unclear. Here, we study computational models of neurons to investigate the functional effects of dendritic spikes. In agreement with previous studies, we found that point neurons or...

Oculars saccades are very fast eyes movements, occurring about 3 times per second, with a maximum speed of 500°/s, and with a mean speed of 200°/s (Westheimer, 1954). This process is essential to explore a visual scene and capture its information. It also carries our facial recognition and reading abilities. During saccades, the representation...

Oculars saccades are very fast eyes movements, occurring about 3 times per second and with a speed of 300 to 1500 mm/s. This process is essential to explore a visual scene and capture its information. It also carries our facial recognition and reading abilities. During saccades, the representation of the visual scene moves at the same speed...

International audience

We present a mean-field formalism able to predict the collective dynamics of large networks of conductance-based interacting spiking neurons. We apply this formalism to several neuronal models, from the simplest Adaptive Exponential Integrate-and-Fire model to the more complex Hodgkin-Huxley and Morris-Lecar models. We show that the resulting...