Table 2a.

Hierarchical Regressions Examining Contributions of Increasingly Complex Processing Speed Measures to the Executive Control Composite Scores in Experiment 1

	Working Memory			Inhibition			Task Switching
Processing Speed Measure	ΔR2	F for Δ	df	ΔR2	F for Δ	df	ΔR2	F for Δ	df
Psychomotor Speed	.005	0.3	1,56	.146**	9.6	1,56	.167**	11.3	1,56
Perceptual Speed	.225**	16.0	1,55	.156**	12.3	1,55	.127**	9.9	1,55

Note—More complex processing speed measures predict additional executive control variance in young adults. n = 58;

^*p < .05;

^**p < .01. Task Switching composite = average of global switch cost, color and shape switching task, global switch cost, quantity and identity switching task, and switch cost, addition and subtraction switching task z scores; Inhibition composite = average of stop signal reaction time, stop signal task, color minus non-color word completion time, Stroop task, and antisaccade percent errors, antisaccade task z scores; Working Memory composite = average of digit span backward, spatial span backward, reading span total items correct, counting span total item correct, and operation span total items correct z scores.