Results of the discrimination experiment.

<p>d’ before and after training at every object level (described in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0043062#pone-0043062-g003" target="_blank">Figure 3</a>). Learning increases the discriminability, for <i>object level 3</i> and <i>object level 4</i> that straddle the perceived category boundary. Error bars = SEM.