Table 2. Relative number of slow waves.

	Cue	Cue from ‘cued+feedback'	t	P-Value	Feedback from ‘cued+feedback'	t	P-Value
Sleep group I+II
Gains	45.16±3.02	33.06±2.18	3.41	0.003**	39.84±2.16	2.41	0.049*
Losses	32.85±3.21	24.53±2.19	2.39	0.027*	27.84±81	1.39	0.183
	Cue from ‘cued+late feedback'	Cue from ‘cued+tone'	t	P-Value	Feedback from ‘cued+late feedback'	t	P-Value
Control group
Gains	49.80±4.78	32.82±5.07	3.97	0.003**	39.44±3.92	2.25	0.048*
Losses	34.85±3.95	28.24±3.58	1.89	0.087	29.74±3.61	1.58	0.144

Data are means±s.e.m.; relative numbers of slow waves following word onset of cues (the percentage of word presentations, which were followed by slow waves) and separately for the cues and the feedback of the ‘cue+feedback' category. For sleep groups I+II (that is, false- and correct-feedback groups), first columns including t-and P-values correspond to differences in the appearance of slow waves between ‘cue' versus cue from ‘cued+feedback'. t- and P-values on the right side depict differences between ‘cue' and feedback from ‘cued and feedback'. For the control group, first columns including t-and P-values correspond to differences in the appearance of slow waves between cue from ‘cued+late feedback' versus cue from ‘cued+tone'. t- and P-values on the right side depict differences between cue ‘cued+late feedback' and Feedback from ‘cued and late feedback'. *P<0.05; **P<0.01.