Importance of optic flow for postural stability of male and female young adults

Raffi, Milena; Piras, Alessandro; Persiani, Michela; Squatrito, Salvatore

doi:10.1007/s00421-013-2750-4

Cited by 34 publications

(26 citation statements)

References 47 publications

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“…Research exploring the relationship between visual field and postural control has also demonstrated that the retinal periphery plays the dominant role in stabilizing posture, particularly in the anterior-posterior (AP) direction [12,[21][22][23][24][25][26] (see [27] for review). In these studies, body sway was less with peripheral stimulation than with central stimulation [22,23,28].…”

Section: Introductionmentioning

confidence: 88%

The Effect of Retinal Eccentricity on Visually Induced Motion Sickness and Postural Control

Kim

2019

Applied Sciences

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The present study investigated the effect of retinal eccentricity on visually induced motion sickness (VIMS) and postural control. Participants wore a head-mounted display masked for the central 10° (peripheral vision), the peripheral except for the central 10° (central vision), or unmasked (control) to watch a highly immersive 3D virtual reality (VR) ride along China’s Great Wall. The Simulator Sickness Questionnaire was administered to assess VIMS symptoms before and after the VR exposure. In addition, postural sway data were collected via sensors attached to each participant’s head, torso, and hip. Results demonstrated that peripheral vision triggered the most severe symptoms of motion sickness, whereas full vision most perturbed posture. The latter finding contradicts previous research findings demonstrating the peripheral advantage of postural control. Although the source of compromised postural control under peripheral stimulation is not clear, the provocative nature of visual stimulation depicting a roller-coaster ride along a rugged path likely contributed to the contradictory findings. In contrast, motion sickness symptoms were least severe, and posture was most stable, under central vision. These findings provide empirical support for the tactic assumed by VR engineers who reduce the size of the field of view to ameliorate the symptoms of motion sickness.

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Section: Introductionmentioning

confidence: 88%

The Effect of Retinal Eccentricity on Visually Induced Motion Sickness and Postural Control

Kim

2019

Applied Sciences

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“…Females were not considered in this study to remove potential bias due to: (i) known influence of anthropometric factors and gender on postural balance in adults (Chiari et al, 2002; Farenc et al, 2003; Alonso et al, 2012); but also because (ii) mechanical, and skeletal differences known to produce different neuromuscular control of the knee joint (Shultz and Perrin, 1999) on body sway resulting in a different postural response (Schmitz et al, 2007; Ku et al, 2012) to sensory alteration (Raffi et al, 2014); and (iii) sensory integration difference with men favoring visual dependency (Raffi et al, 2014; Persiani et al, 2015). Since our findings may originate simply from the practice of sports in general, gymnasts’ performance was compared to the performance of a control group composed of 10 NG males who were also experts in sport (soccer, handball, or tennis).…”

Section: Methodsmentioning

confidence: 99%

Regularity of Center of Pressure Trajectories in Expert Gymnasts during Bipedal Closed-Eyes Quiet Standing

Isableu

Hlavackova

Diot

et al. 2017

Front. Hum. Neurosci.

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We compared postural control of expert gymnasts (G) to that of non-gymnasts (NG) during bipedal closed-eyes quiet standing using conventional and nonlinear dynamical measures of center of foot pressure (COP) trajectories. Earlier findings based on COP classical variables showed that gymnasts exhibited a better control of postural balance but only in demanding stances. We examined whether the effect of expertise in Gymnastic can be uncovered in less demanding stances, from the analysis of the dynamic patterns of COP trajectories. Three dependent variables were computed to describe the subject’s postural behavior: the variability of COP displacements (ACoP), the variability of the COP velocities (VCoP) and the sample entropy of COP (SEnCoP) to quantify COP regularity (i.e., predictability). Conventional analysis of COP trajectories showed that NG and G exhibited similar amount and control of postural sway, as indicated by similar ACoP and VCoP values observed in NG and G, respectively. These results suggest that the specialized balance training received by G may not transfer to less challenging balance conditions such as the bipedal eyes-closed stance condition used in the present experiment. Interestingly, nonlinear dynamical analysis of COP trajectories regarding COP regularity showed that G exhibited more irregular COP fluctuations relative to NG, as indicated by the higher SEnCoP values observed for the G than for the NG. The present results showed that a finer-grained analysis of the dynamic patterns of the COP displacements is required to uncover an effect of gymnastic expertise on postural control in nondemanding postural stance. The present findings shed light on the surplus value in the nonlinear dynamical analysis of COP trajectories to gain further insight into the mechanisms involved in the control of bipedal posture.

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“…As dedicated ecological psychologists, we hope that the answer may be found to some interesting degree in the contextual structure surrounding the organism during the task. Optic flow can influence both head sway (Sparto, Furman, & Redfern, 2006) and full-body posture (Raffi, Piras, Persiani, & Squatrito, 2014), although further work remains to specify the likely taskdependent alignment between the two. In the short term, we sought to experimentally subvert the multifractal structure of head sway by manipulating the nesting of visual textures in what was available to participants during a motor task requiring visual perception.…”

Section: Aligning Multifractal Cascades With Gibsonian Emphasis On Nementioning

confidence: 98%

Nesting of Focal Within Peripheral Vision Promotes Interactions Across Nested Time Scales in Head Sway: Multifractal Evidence From Accelerometry During Manual and Walking-Based Fitts Tasks

Eddy

Kelty-Stephen

2015

Ecological Psychology

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Nesting is a major cornerstone in ecological theorizing about visual perception, through both nesting of surface layout in locomotory movements and nesting of visually available surfaces within each other, from focal to peripheral vision. This work sought to probe these nesting relationships by examining the effects of the visual periphery on the strength of interactions among nested time scales in head sway. That is, we tested whether spatial nesting of the focal within peripheral visual fields stimulated nonlinear interactions amid temporal nesting. We examined head sway during 2 variants of the Fitts task, one involving manual pointing by seated participants and another involving walking comfortably with upright standing posture. All participants completed both tasks but were randomly assigned to experience these tasks with or without the visual periphery available. Multifractal analysis of head sway revealed that visual availability of the periphery promoted nonlinear interactions across nested time scales, but this effect depended on how much head sway extended across a plane than more ballistically along a single axis of variability.

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Importance of optic flow for postural stability of male and female young adults

Cited by 34 publications

References 47 publications

The Effect of Retinal Eccentricity on Visually Induced Motion Sickness and Postural Control

The Effect of Retinal Eccentricity on Visually Induced Motion Sickness and Postural Control

Regularity of Center of Pressure Trajectories in Expert Gymnasts during Bipedal Closed-Eyes Quiet Standing

Nesting of Focal Within Peripheral Vision Promotes Interactions Across Nested Time Scales in Head Sway: Multifractal Evidence From Accelerometry During Manual and Walking-Based Fitts Tasks

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