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Related Experiment Video

Updated: May 31, 2026

A Simple Stimulatory Device for Evoking Point-like Tactile Stimuli: A Searchlight for LFP to Spike Transitions

A Simple Stimulatory Device for Evoking Point-like Tactile Stimuli: A Searchlight for LFP to Spike Transitions

Published on: March 25, 2014

Feedback enhances feedforward figure-ground segmentation by changing firing mode.

Hans Supèr¹, August Romeo

¹Institute for Brain, Cognition and Behavior (IR3C), Barcelona, Spain. hans.super@icrea.es

|July 9, 2011

Summary

Feedback projections in the visual cortex enhance figure-ground segregation. Our model shows feedback alters neural firing patterns, strengthening figure responses and suppressing background, improving signal detection.

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Force and Position Control in Humans - The Role of Augmented Feedback

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A Simple Stimulatory Device for Evoking Point-like Tactile Stimuli: A Searchlight for LFP to Spike Transitions

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Published on: March 25, 2014

Force and Position Control in Humans - The Role of Augmented Feedback

Force and Position Control in Humans - The Role of Augmented Feedback

Published on: June 19, 2016

Area of Science:

Neuroscience
Computational Neuroscience
Visual Perception

Background:

Feedback projections in the visual cortex are hypothesized to play a role in figure-ground segregation.
The exact function of these feedback connections remains unclear.

Purpose of the Study:

To test a hypothetical model of reentrant feedback in the visual cortex.
To investigate the role of feedback in figure-ground segregation using a computational model.

Main Methods:

A 2-layered feedforward spiking network, previously developed for figure-ground segregation, was modified to include feedback connections.
Computer simulations were used to analyze neural responses to figure-ground stimuli with and without feedback.

Main Results:

Without feedback, neurons exhibited low-frequency bursting (∼9 Hz) in response to figure-ground stimuli.
Inclusion of feedback resulted in a shift to regular tonic spiking patterns.
Feedback enhanced neural responses to the figure and suppressed responses to the background, creating a stronger figure-ground signal (push-pull effect).

Conclusions:

Feedback connections in the visual cortex significantly influence neural firing patterns.
Feedback plays a crucial role in figure-ground segregation by modulating neuronal activity.
The proposed model demonstrates how feedback controls figure-ground segregation through altered neural firing patterns.