Figure 4.

Results of the behavioral experiments with Glossophaga soricina. (A) Psychometric function of the ability of six bats to discriminate between targets with different structure depth (experiment I). The results of the different bats are marked by different symbols. The x-axis gives the structure depth of the unrewarded target, while we always trained on the target with the 63 μm structure. The dashed line marks the 75% threshold. (B) Results of experiment II. Mean percentages of correct choices for discrimination of selected pairs of targets. Each pair was presented to each of the four bats for two nights. The error bars indicate the standard error. X-Axis: upper line: difference of structure depth of the respective pair. Middle line: magnified images of the structured targets. Two bottom lines: structure depth of the targets in μm and name of the respective pair.