Model for metacontrast and repetition masking experiments.

<p><b>A</b>: The first layer consists of two separate channels containing neurons that respond either to the onset (ON) or to the removal (OFF) of the target stimulus. Layer 2 integrates the input from layer 1. Receptive fields as in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0031773#pone-0031773-g001" target="_blank">figure 1</a>. <b>B</b>: Spike responses to the onset and removal of the target stimulus from units shown by small black circles.