FIGURE 19.

Independence of optical disector counts from object recognition criteria. Two observers are looking at the same sample of cells. One of them (early) recognizes the object rather early and one of them (late) recognizes them rather late. Differences in the first recognition (arrows) of objects between observers cancel each other across the top and bottom focal planes that define the height of the optical disector. Regardless how objects are recognized, both observers will count two objects (green arrows) in this example. (Adapted from West et al. (1991), figure 7) [Color figure can be viewed at wileyonlinelibrary.com]