Analysis of correlations of learning scores in controls and treated bees.

<p>H0 indicates the null hypothesis being tested. R² represents the adjusted correlation factor of the linear regression. For each comparison, the corresponding Figure number is given. There is a strong correlation between the learning scores of control bees and bees treated with IPA; all groups showed significant learning, as described earlier. In bees displaying Type 1 responses (<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0174321#pone.0174321.g004" target="_blank">Fig 4A</a>), the slope of the regression line is not significantly different from that predicted by the null hypothesis, but the regression line intercept reveals that the learning scores of IPA-treated bees displaying Type 1 responses are significantly lower overall than those of controls (CT). In contrast, in bees displaying Type 2 responses (<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0174321#pone.0174321.g004" target="_blank">Fig 4A'</a>), the regression line intercept is higher than predicted by the null hypothesis. As low learning scores (<3) were less prevalent in bees displaying Type 2 responses than in Controls, the slope of the regression line deviates significantly from 1. In the lower half of Table 1, the slope and intercept of the regression lines generated for IPA are compared with those generated in the same manner for bees treated with ASTA, ASTC or ASTCC, at times when bees were displaying Type 1 or Type 2 (prime letters) responses to IPA. The analysis shows that effects of ASTCC treatment most closely resemble the effects of IPA.