Codificación neuronal en etapas tempranas del procesamiento visual
Early processing of visual information takes place in the retina, via diverse biochemical and physiological processes that relate neural responses of different neuronal classes in a well-defined laminar organization. Overall, this is a feedforward processing and it has a well determined output signa...
Guardado en:
| Autores principales: | , , , , , , , , , , , |
|---|---|
| Publicado: |
2019
|
| Materias: | |
| Acceso en línea: | https://bdigital.uncu.edu.ar/fichas.php?idobjeto=14533 |
| Sumario: | Early processing of visual information takes place in the retina, via diverse biochemical and physiological processes that relate neural responses of different neuronal classes in a well-defined laminar organization. Overall, this is a feedforward processing and it has a well determined output signal: the action potentials that ganglionar cells send through the optical nerve to the primary visual cortex. The most important contribution of this firing activity is the coding occurying in the so called bipolar cells, which gate and process the visual information transduced in the photoreceptors. In this project, we will study with some detail those information processing stages that mediate the different bipolar cells' responses found in mammalian retina. Based on an adequate mathematical model of the phototransduction, the synaptic transmission, the temporal-spatial-chromatic integration of visual information, and the negative feedback provided by horizontal cells, we will derive the response properties of bipolar cells, not only regarding the definition of their receptive fields but also with respect to the nonlinear processing attributed to adaptation to different mean luminosities. On the other hand, relying on this detailed description, we will numerically explore the effect of new processes recently found in experiments, the computational consequences of different conflicting alternatives, and the effect of intrinsic noise originated at different locations on the system's response. |
|---|
