24 The five case circles with their matched control circles are mapped in figure 1.
These circles are toilets.
Open circles are earthquakes.
Social circles are vital.
Circles are very symmetric.
Colored circles were matched for size and color intensity, and formed two different stimulus sets (yellow, blue, red; or green, orange, pink).
Materials and methods, Material and task: "Colored circles were matched for size and color intensity, and formed two different stimulus sets (yellow, blue, red; or green, orange, pink).
The decision to employ a circle-matched design in this study, in which case and control circles were also matched on a variety of other socioeconomic factors, reduced the need to adjust for many of these factors explicitly in our analysis but does not entirely eliminate it.
In the target-on condition, the indicator stimulus was a change that occurred at the location of the target: The dark inside of one of the potential target circles was filled in to match the white outline of the circle.
