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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/69709
Feedback enhances feedforward figure-ground segmentation by changing firing mode
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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.
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SUPÈR, Hendrik Anne and ROMEO VAL, August. Feedback enhances feedforward figure-ground segmentation by changing firing mode. PLoS One. 2011. Vol. 6, num. 6. ISSN 1932-6203. [consulted: 11 of August of 2026]. Available at: https://hdl.handle.net/2445/69709