Table 4. Hierarchical Regression Analyses of AV Performance and Age.

	Step 1: Unimodal Variance		Step 2: Age-related Variance
Condition	R2	F(df)	ΔR2	Δ F(df)_
AV, Blur 0	.607	F(2,106)=82.0*	.000	F(1,105)=0.1
AV, Blur 1	.585	F(2,106)=74.6*	.001	F(1,105)=0.2
AV, Blur 2	.562	F(2,106)=67.9*	.000	F(1,105)=0.0
AV, Blur 3	.454	F(2,106)=44.1*	.000	F(1,105)=1.2
AV, Blur 4	.340	F(2,106)=27.3*	.002	F(1,105)=0.3

Note: Unimodal variance includes performance in the corresponding V-only blur condition and in the A-only condition.

^*p<.001