Estelle Blons

Laurent M. Arsac

Pierre Gilfriche

Véronique Deschodt-Arsac

Frontiers in Physiology

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Corrigendum: Frequency-Specific Fractal Analysis of Postural Control Accounts for Control Strategies

Gilfriche, Pierre

Deschodt-Arsac, Veronique

Blons, Estelle

Arsac, Laurent,

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CORRECTIONpublished: 02 November 2018doi: 10.3389/fphys.2018.01566Frontiers in Physiology | www.frontiersin.org 1 November 2018 | Volume 9 | Article 1566Edited and reviewed by:Zbigniew R. Struzik,The University of Tokyo, Japan*Correspondence:Pierre Gilfrichepierre.gilfriche@u-bordeaux.frSpecialty section:This article was submitted toFractal Physiology,a section of the journalFrontiers in PhysiologyReceived: 14 August 2018Accepted: 18 October 2018Published: 02 November 2018Citation:Gilfriche P, Deschodt-Arsac V, Blons Eand Arsac LM (2018) Corrigendum:Frequency-Specific Fractal Analysis ofPostural Control Accounts for ControlStrategies. Front. Physiol. 9:1566.doi: 10.3389/fphys.2018.01566Corrigendum: Frequency-SpecificFractal Analysis of Postural ControlAccounts for Control StrategiesPierre Gilfriche 1,2*, Véronique Deschodt-Arsac 2, Estelle Blons 2 and Laurent M. Arsac 21CATIE - Centre Aquitain des Technologies de l’Information et Electroniques, Talence, France, 2Univ. Bordeaux, CNRS,Laboratoire IMS, UMR 5218, Talence, FranceKeywords: postural control, center-of-pressure, fractal physiology, DFA, FsFA, 1/f scalingA Corrigendum onFrequency-Specific Fractal Analysis of Postural Control Accounts for Control Strategiesby Gilfriche, P., Deschodt-Arsac, V., Blons, E., and Arsac, L. M. (2018) Front. Physiol. 9:293.doi: 10.3389/fphys.2018.00293In the original article, there was an error. In the Discussion, we analyze how the scaling exponentscomputed on the differentiated signal and the original signal can be used to describe the frequencycontent of the signal in a global model. When differentiating the signal, we supposed that the valueof β increased by 2, however, as β is the opposite of the slope in the power spectral density, thevalue of β decreased by 2 when the signal is differentiated. Thus, the equations β1 = 2×α1 +1 andβ1 =(2×α1−1)+2 are incorrect and should be replaced by: β1 =2×α1 − 3 and β1 =(2×α1 − 1)−2.A correction has been made to Discussion, Interpretations and confrontation with othertheories, paragraph two:Indeed, Figure 7 shows that the whole frequency content of the CoP velocity signal could thenbe described by four parameters:• Pf0 (or AAMV)• β1, the opposite of the slope of the low-frequency antipersistent range, withβ1 = 2× α1 − 3• α1 being here the frequency-specific fractal exponent associated with visuo-vestibular loops(low-frequencies) in CoP position. This result is obtained by the fact that β1 is computedfrom the CoP velocity while α1 is computed from CoP position, its integral, so more precisely:β1 = (2× α1 − 1) − 2.• β2, the opposite of the slope of the high-frequency persistent range, withβ2 = 2× α2 − 1• α2 being here the frequency-specific fractal exponent associated with proprioceptive loops(high-frequencies) in CoP velocity.• f0, the crossover frequency, which might be variable from one individual to another but is likelybetween 0.5 and 2Hz according to the literature.Gilfriche et al. Corrigendum: FsFA for Postural ControlThe authors apologize for this error and state that this doesnot change the scientific conclusions of the article in any way.The original article has been updated.Conflict of Interest Statement: The authors declare that the research wasconducted in the absence of any commercial or financial relationships that couldbe construed as a potential conflict of interest.Copyright © 2018 Gilfriche, Deschodt-Arsac, Blons and Arsac. This is an open-accessarticle distributed under the terms of the Creative Commons Attribution License (CCBY). The use, distribution or reproduction in other forums is permitted, providedthe original author(s) and the copyright owner(s) are credited and that the originalpublication in this journal is cited, in accordance with accepted academic practice.No use, distribution or reproduction is permitted which does not comply with theseterms.Frontiers in Physiology | www.frontiersin.org 2 November 2018 | Volume 9 | Article 1566

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Corrigendum: Frequency-Specific Fractal Analysis of Postural Control Accounts for Control Strategies

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