Table 5.

Performance on Working Memory Tasks

						Amount of change from baseline
Task		Group	–1 Week (baseline)	0 Week (single dose)	12 Weeks	0 Week (single dose)	12 Weeks
FPCPT (Part 3)	Correct responses	Placebo	14.9 ± 2.0	15.2 ± 1.2	15.6 ± 0.6
		Theanine	14.8 ± 2.3	15.9 ± 0.3	15.7 ± 0.8
	Average correct response time	Placebo	629 ± 196	577 ± 89	556 ± 85
		Theanine	594 ± 135	542 ± 101	535 ± 84
	Incorrect responses	Placebo	0.15 ± 0.61	0.19 ± 0.40	0.04 ± 0.20
		Theanine	0.27 ± 1.2	0.00 ± 0.00	0.08 ± 0.27
	Average incorrect response time	Placebo	66.6 ± 236	172 ± 433	32.5 ± 159
		Theanine	38.0 ± 136	0.0 ± 0.0	127 ± 564
	Omission errors	Placebo	1.12 ± 2.0	0.77 ± 1.2	0.42 ± 0.58
		Theanine	1.15 ± 2.3	0.12 ± 0.33	0.27 ± 0.83
(Part 4)	Correct responses	Placebo	12.0 ± 2.3	12.1 ± 2.2	12.5 ± 2.6	0.2 ± 2.3	0.8 ± 2.7
		Theanine	11.8 ± 3.4	13.4 ± 2.8*	13.3 ± 2.0	1.6 ± 2.5	1.5 ± 3.4
	Average correct response time	Placebo	698 ± 117	691 ± 129	659 ± 111
		Theanine	704 ± 173	676 ± 162	625 ± 98
	Incorrect responses	Placebo	1.6 ± 1.6	1.6 ± 1.2	1.7 ± 1.7
		Theanine	1.6 ± 1.9	1.4 ± 1.6	1.5 ± 1.4
	Average incorrect response time	Placebo	581 ± 431	769 ± 448	467 ± 428	188 ± 497	−91.0 ± 448
		Theanine	742 ± 511	584 ± 504	653 ± 415	−158 ± 590*	−88.8 ± 756
	Omission errors	Placebo	4.0 ± 2.3	3.9 ± 2.2	3.5 ± 2.6	−0.2 ± 2.3	−0.8 ± 2.7
		Theanine	4.2 ± 3.4	2.6 ± 2.8*	2.7 ± 2.0	−1.6 ± 2.5	−1.5 ± 3.4

Values are presented as mean ± SD.

^*P < .05/3 = 0.017 versus placebo group. P values were calculated using the Mann–Whitney U test and Bonferroni correction.