Table 2.

Group differences during forced-choice recognition (FC) and Matrix Reasoning (MR) task

Variable	Sham	nVNS	F-Stat	P-value
True negative, mean (SD)	22.7 (2.0)	23.9 (1.3)	3.735	0.064
True positive, mean (SD)	23.5 (3.9)	23.2 (2.7)	0.058	0.812
FC false negative, mean (SD)	7.3 (2.0)	6.0 (1.3)	4.318	0.047
FC false positive, mean (SD)	6.5 (4.0)	6.6 (2.7)	0.006	0.937
MR items correct, mean (SD)	23.1 (3.9)	26.4 (1.3)	10.763	0.015
MR easy accuracy, % mean (SD)	88.3 (8.3)	94.6 (3.7)	6.569	0.017
MR hard accuracy, % mean (SD)	54.2 (25.7)	74.3 (10.2)	7.270	0.013
MR easy reaction time in sec., mean (SD)	7.1 (0.7)	7.62 (0.7)	4.191	0.052
MR hard reaction time in sec., mean (SD)	7.9 (1.9)	9.8 (1.9)	6.987	0.014

Notes. Recall errors during forced-choice recognition and accuracy and reaction times during MR task performance. nVNS = noninvasive vagal nerve stimulation.