Fig. 1.

Effects of training on sensitivity to luminance-defined (LD) motion (solid lines) and texture-contrast-defined (CD) motion (dashed lines). The top panel shows the results for 6 participants trained in the LD motion task and the mean performance of the group. In this panel, the solid lines are bold to indicate that this was the training task. The bottom panel shows the results for 5 participants trained in the CD motion task and mean results for the group. The dashed lines are bold to indicate that CD motion was the training task. The disconnected markers on the far right of each panel show the results of the posttraining test, which occurred 10–12 days after the completion of training (1 observer who was trained in the CD motion task did not take the posttraining test). In each of the top and bottom panels, each different marker type shows the thresholds measured for a single observer in both the LD and CD motion tasks. Note that for each observer, although performance improved substantially in the training task, performance in the nontrained task remained flat