Behavioral results.

<p>a) Results obtained in our previous research, showing that the effect of reward bias depended on the attentional role of each stimulus during biased reward delivery (<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0019460#pone.0019460-DellaLibera2" target="_blank">[28]</a> Exp. 1). b) Results obtained in the present Experiment, showing a generalized effect of reward bias, unaffected by the associated attentional roles. Note that the y-axes scales in a) and b) slightly differ. In all plots error bars denote SEM.