Table 1.

Matrix symmetry task effect sizes associated with age group and task manipulation.

	Effect size
A. EFFECT OF AGE IN EACH STIMULUS CONDITION
Random matrices	d = 1.356
Vertical symmetry matrices	d = 1.021
Horizontal symmetry matrices	d = 1.377
Diagonal symmetry matrices	d = 1.413
B. EFFECTS Of SYMMETRY CONDITION
Younger adults
Random vs. vertical symmetry	d = 1.615
Random vs. horizontal symmetry	d = 1.464
Random vs. diagonal symmetry	d = 0.522
Older adults
Random vs. vertical symmetry	d = 2.026
Random vs. horizontal symmetry	d = 1.870
Random vs. diagonal symmetry	d = 0.982