Contrast and tuning properties of neurons in the visual cortex: Modeling and data analysis - Couverture souple

Persi, Erez; Hansel, David; Van, Carl

 
9783639201307: Contrast and tuning properties of neurons in the visual cortex: Modeling and data analysis
Couverture souple
ISBN 10 : 3639201302 ISBN 13 : 9783639201307
Editeur : VDM Verlag Dr. Müller, 2010

Synopsis

We developed a model to investigate possible mechanisms underlying the shape of contrast (CRF) and tuning (OT) curves of neurons in the primary visual cortex, V1. We determine analytically the conditions for the structure of the afferent LGN and recurrent V1 inputs that lead to contrast-invariance width of the OT curve and to the nonlinear shape of the CRF. We investigate what are the relative contributions of single neuron and network properties in shaping the OT and the CRF. We test our model with numerical simulations of conductance-based model (CBM). The results indicate that the main effect of a cortex of neurons with accelerating transfer-functions, described here by a power-law, is sharpening. Thus, the OT curves of V1 neurons are more tuned, and their CRF is steeper, than those of their inputs. Last, we show that we are able to account for the heterogeneity in the measured CRFs, by introducing inhomogeneities either in single neuron properties or in the input to the neurons. Correlations among the CRF parameters are different for the different sources for diversity. Comparison with experimental data shows that both sources contribute about equally to heterogeneity in V1.

Les informations fournies dans la section « Synopsis » peuvent faire référence à une autre édition de ce titre.

Présentation de l'éditeur

We developed a model to investigate possible mechanisms underlying the shape of contrast (CRF) and tuning (OT) curves of neurons in the primary visual cortex, V1. We determine analytically the conditions for the structure of the afferent LGN and recurrent V1 inputs that lead to contrast-invariance width of the OT curve and to the nonlinear shape of the CRF. We investigate what are the relative contributions of single neuron and network properties in shaping the OT and the CRF. We test our model with numerical simulations of conductance-based model (CBM). The results indicate that the main effect of a cortex of neurons with accelerating transfer-functions, described here by a power-law, is sharpening. Thus, the OT curves of V1 neurons are more tuned, and their CRF is steeper, than those of their inputs. Last, we show that we are able to account for the heterogeneity in the measured CRFs, by introducing inhomogeneities either in single neuron properties or in the input to the neurons. Correlations among the CRF parameters are different for the different sources for diversity. Comparison with experimental data shows that both sources contribute about equally to heterogeneity in V1.

Les informations fournies dans la section « A propos du livre » peuvent faire référence à une autre édition de ce titre.

Éditeur
VDM Verlag Dr. Müller
Date d'édition
2010
Langue
anglais
ISBN 10 
3639201302
ISBN 13 
9783639201307
Reliure
Broché
Nombre de pages
136
Coordonnées du fabricant
non disponible
Personne responsable
non disponible