Erratum to: Testing the potential of a virtual reality neurorehabilitation system during performance of observation, imagery and imitation of motor actions recorded by wireless functional near-infrared spectroscopy (fNIRS)

Table 2 Bilateral group

Bilateral group [N = 8]	Observation right	Observation left	Imitation right	Imitation left
Left hemisphere (contralateral) (μmol/ l ± SD)
Mean ∆ [O₂Hb]	0.1231 ± 0.1506	0.1231 ± 0.1507	0.3941 ± 0.4598	0.3715 ± 0.4289
Mean ∆ [HHb]	−0.0056 ± 0.0676	−0.0408 ± 0.0915	0.0371 ± 0.1131	0.0474 ± 0.0665
Intra-condition, ANOVA, repeated measures
[O₂Hb] rest-stim	p = 0.044*	p = 0.047*	p = 0.025*	p = 0.038*
[HHb] rest-stim	p = 0.821	p = 0.247	p = 0.384	p = 0.084
Inter-condition, ANOVA, repeated measures, post-hoc-tests, Bonferroni 0.05		∆ [HHb]	∆ [O ₂ Hb]
	O_R – O_L	p = 1.000	p = 1.000
	O_R – IM_R	p = 1.000	p = 0.519
	O_R – IM_L	p = 1.000	p = 0.862
	OL_ – IM_R	p = 0.227	p = 0.486
	O_L – IM_L	p = 0.223	p = 0.777
	IM_R – IM_L	p = 1.000	p = 1.000
Main effect on condition		p = 0.072	p = 0.119
Right hemisphere (ipsilateral) (μmol/ l ± SD)
Mean ∆ [O₂Hb]	0.1541 ± 0.0735	0.1957 ± 0.1957	0.4036 ± 0.2097	1.3728 ± 1.6143
Mean ∆ [HHb]	−0.0113 ± 0.0334	0.0068 ± 0.0274	0.0235 ± 0.0402	0.7016 ± 1.9167
Intra-condition, ANOVA, repeated measures
[O₂Hb] rest-stim	p = 0.077	p = 0.080	p = 0.002*	p = 0.032*
[HHb] rest-stim	p = 0.367	p = 0.502	p = 0.142	p = 0.335
Inter-condition, ANOVA, repeated measures, post-hoc-tests, Bonferroni 0.05		∆ [HHb]	∆ [O₂Hb]
	O_R – O_L	p = 1.000	p = 1.000
	O_R – IM_R	p = 0.445	p = 0.014*
	O_R – IM_L	p = 1.000	p = 0.324
	OL_ – IM_R	p = 1.000	p = 0.015*
	O_L – IM_L	p = 1.000	p = 0.231
	IM_R – IM_L	p = 1.000	p = 0.710
Main effect on condition		p = 0.384	p = 0.008*

(Top) Mean signal amplitudes (μmol/l ± SD) of channels with significant concentration changes. Separate calculations for increases in [O₂Hb], decreases in [HHb] in response to the four conditions for each group. Numbers were rounded to four decimal places. (Middle) Intra-condition statistical significance of the mean change between [O₂Hb]_rest and [O₂Hb]_stim and [HHb]_rest and [HHb]_stim using repeated measures ANOVA. (Bottom) Inter-condition statistical significance of mean changes of ∆ [O₂Hb] and ∆ [HHb] between the four conditions using repeated measures ANOVA. Shown are post-hoc tests (with Bonferroni correction); significant values (p ≤ 0.05) are highlighted by * (observation left = O_L, observation right = O_R, imitation left = IM_L, imitation right = IM_R).

ISSN: 1743-0003