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Open Access Correction

Correction: 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)

Lisa Holper12*, Thomas Muehlemann13, Felix Scholkmann1, Kynan Eng2, Daniel Kiper2 and Martin Wolf1

Author Affiliations

1 Biomedical Optics Research Laboratory (BORL), Division of Neonatology, Department of Obstetrics and Gynecology, University Hospital Zurich, Frauenklinikstrasse 10, 8091, Zurich, Switzerland

2 Institute of Neuroinformatics (INI), University of Zurich and ETH Zurich, Winterthurerstrasse 190, 8057, Zurich, Switzerland

3 Molecular Imaging and Functional Pharmacology, Institute for Biomedical Engineering, ETH and University of Zurich, Wolfgang-Pauli-Strasse 27, 8093, Zurich, Switzerland

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Journal of NeuroEngineering and Rehabilitation 2013, 10:16  doi:10.1186/1743-0003-10-16

The electronic version of this article is the complete one and can be found online at: http://www.jneuroengrehab.com/content/10/1/16


Received:1 February 2013
Accepted:1 February 2013
Published:8 February 2013

© 2013 Holper et al; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Correction

Following publication of our article [1], we realised that some of the statistical tests used were not appropriate. We have now conducted the appropriate statistical tests, and updated the relevant tables, figures five and six (Figures 1 and 2 here, respectively) and conclusions accordingly.

thumbnailFigure 1. Unilateral group recorded over contralateral hemisphere: shown are the Δ[O2Hb] amplitude changes with standard error of the mean (SEM) and statistical significances of repeated measures ANOVA.

thumbnailFigure 2. Bilateral group recorded over contra- (dark gray) and ipsilateral (light gray) hemisphere: shown are the Δ[O2Hb] amplitude changes with standard error of the mean (SEM) and statistical significances of repeated measures ANOVA.

For both the unilateral and the bilateral groups, analyses were recalculated.

Intra-condition differences:

• original publication [1]: paired t-test using means per trial for unilateral and bilateral group

• update: one-way repeated measures ANOVA using means per subject for unilateral and bilateral group

Inter-condition differences:

• original publication [1]: one-way ANOVA using means per trial for unilateral and bilateral group

• update: one-way repeated measures ANOVA using means per subject for unilateral and bilateral group

Conclusions

For the unilateral group (Table 1 and Figure 1), no changes in significance levels were found in Δ[O2Hb] signals. For the bilateral group (Table 2 and Figure 2), the main differences compared to the original publication are that the intra-condition differences ([O2Hb]rest versus [O2Hb]stim) for the two conditions ‘Observation Right’ (O_R, p = 0.077) and ‘Observation Left’ (O_L, p = 0.080) recorded over the ipsilateral hemisphere do not reach significant level any more. Hence, the paragraphs discussing the intra-condition significances in those two conditions (sections Observation, imagery and imitation and Bilateral oxygenation of the Discussion) are only applicable for the contralateral hemisphere. Further, in both groups changes in significance levels were found for Δ[HHb]. However, since the Discussion and Conclusion of the originally published article only focuses on the concentration changes found in Δ[O2Hb], this aspect does not change these sections.

Table 1. Unilateral group

Table 2. Bilateral group

References

  1. Holper L, et al.: 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).

    J Neuroeng Rehabil 2012, 7:57. OpenURL