Table 1.

Stimulus protocols

Stimulus type protocol	Spatial arrangement	Surface area	Circumference	Density
Standard	Randomized†	Increasing with quantity	Increasing with quantity	Increasing with quantity
Equal area and equal density	Randomized†	Equal across quantity	Increasing with quantity	Equal across quantity‡
Equal circumference	Randomized†	Decreasing with quantity	Equal across quantity	Increasing with quantity
Linear	One-dimensional, linear	Increasing with quantity	Increasing with quantity	Increasing with quantity

^†Three dots tend to be arranged as triangle, four dots as quadrangle, five dots as pentagon.

^‡Density determined by calculating the average distance between all dots in a given display.