Título:
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Feedback enhances feedforward figure-ground segmentation by changing firing mode
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Autor/a:
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Supèr, Hendrik Anne; Romeo Val, August
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Otros autores:
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Universitat de Barcelona |
Abstract:
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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. |
Materia(s):
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-Neurones -Còrtex visual -Cognició -Neurons -Visual cortex -Cognition |
Derechos:
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cc-by (c) Supèr, Hendrik Anne et al., 2011
http://creativecommons.org/licenses/by/3.0/es |
Tipo de documento:
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Artículo Artículo - Versión publicada |
Editor:
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Public Library of Science (PLoS)
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