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Title: Feedback enhances feedforward figure-ground segmentation by changing firing mode
Author: Supèr, Hendrik Anne
Romeo Val, August
Keywords: Neurones
Còrtex visual
Visual cortex
Issue Date: 2011
Publisher: Public Library of Science (PLoS)
Abstract: In the visual cortex, feedback projections are conjectured to be crucial in figure-ground segregation. However, the precise function of feedback herein is unclear. Here we tested a hypothetical model of reentrant feedback. We used a previous developed 2-layered feedforwardspiking network that is able to segregate figure from ground and included feedback connections. Our computer model data show that without feedback, neurons respond with regular low-frequency (~9 Hz) bursting to a figure-ground stimulus. After including feedback the firing pattern changed into a regular (tonic) spiking pattern. In this state, we found an extra enhancement of figure responses and a further suppression of background responses resulting in a stronger figure-ground signal. Such push-pull effect was confirmed by comparing the figure-ground responses withthe responses to a homogenous texture. We propose that feedback controlsfigure-ground segregation by influencing the neural firing patterns of feedforward projecting neurons.
Note: Reproducció del document publicat a:
It is part of: PLoS One, 2011, vol. 6, num. 6
Related resource:
ISSN: 1932-6203
Appears in Collections:Articles publicats en revistes (Cognició, Desenvolupament i Psicologia de l'Educació)

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