Figure 1.

Two possible layouts for a Visual World Paradigm trial. The goal of this experiment is to measure phonological cohort effects. Subjects hear auditory instructions to “click on the square.” While all subjects will ultimately look at the square, the question is whether the proportion of looks to objects whose name starts with “s” (the phonological competitors) will decline more slowly than those to objects whose name does not (the distractors). In the panel on the left, objects from the three conditions are intermixed and close to one another. Since Webcam eyetrackers are often only accurate to about 100 pixels, fixations to different objects may be difficult to distinguish. In the right panel, the display has been reduced to a single exemplar of each type, allowing them to be spaced far apart from one another, improving our ability to infer which object is being fixated.