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. Author manuscript; available in PMC: 2019 Aug 17.

Published in final edited form as: J Cogn Neurosci. 2018 May 23;30(9):1330–1344. doi: 10.1162/jocn_a_01286

Table 1.

Group Demographics, Task Performance, and Dopamine

					Effect size
		Young	Older	t	Cohen’s d

Age (years)	M	23.80	77.43
	SD	2.59	3.87
Task switch RT	M	979.71	1,167.50	t = 3.71	1.29
	SD	167.09	120.60	p < .001
Task repeat RT	M	902.37	1,079.07	t = 3.54	1.25
	SD	175.99	94.05	p = .001
Switch cost (%)	M	9.42	8.25	t< 1	0.15
	SD	8.59	7.02	p > .05
DCA [¹⁸F]FMT K_i	M	0.026	0.032	t = 5.07	1.67
	SD	0.0003	0.0003	p < .001