Z-transformed partial correlations between simulation data and curve fitting.

<p>Black circles are neurons having fits that are significantly better described by the response gain model. Dotted lines indicate the threshold for statistical significance. For the majority of neurons in both the model and experimental data (See Fig. 3A in <a href="http://www.ploscompbiol.org/article/info:doi/10.1371/journal.pcbi.1003577#pcbi.1003577-Lee1" target="_blank">[5]</a>), the attentional effect on contrast-response functions is significantly better explained by response gain.