<p>Bars and neurons are similarly visualized as in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0036223#pone-0036223-g008" target="_blank">Fig. 8</a>. For clarity, interactions between single feature tuned neurons are shown separately (on the left) from those between conjunctive neurons. To avoid clutter, only interactions associated with neurons responding to the target bar and two of the non-target bars are shown, the baseline suppression on the single feature tuned cells and suppression between single feature tuned and conjunctive neurons are not shown. Each single feature tuned neuron, regardless of its preferred feature and regardless of whether it is responding to the target, experiences iso-feature suppression from neurons responding to about half of the neighboring bars. Hence, single feature tuned neurons cannot distinguish the target by their response levels. The conjunctive neuron (‘RV’) responding to the target experiences iso-single-feature suppression ( or ) from other conjunctive neurons responding to all neighboring bars, whereas each conjunctive neuron responding to a non-target experiences iso-double-feature suppression () from conjunctive neurons responding to only half of the neighboring bars. The target cannot be distinguished by a higher response (from the ‘RV’ neuron) if , or if this neuron's response is weaker than the responses from the single feature tuned neurons.</p
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