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http://hdl.handle.net/2445/69709
Title: | Feedback enhances feedforward figure-ground segmentation by changing firing mode |
Author: | Supèr, Hendrik Anne Romeo Val, August |
Keywords: | Neurones Còrtex visual Cognició Neurons Visual cortex Cognition |
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: http://dx.doi.org/10.1371/journal.pone.0021641 |
It is part of: | PLoS One, 2011, vol. 6, num. 6 |
URI: | http://hdl.handle.net/2445/69709 |
Related resource: | http://dx.doi.org/10.1371/journal.pone.0021641 |
ISSN: | 1932-6203 |
Appears in Collections: | Articles publicats en revistes (Cognició, Desenvolupament i Psicologia de l'Educació) |
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