Experimental Brain Research

, Volume 234, Issue 10, pp 2957–2965 | Cite as

Constraining eye movement in individuals with Parkinson’s disease during walking turns

  • V. N. Pradeep Ambati
  • Fabricio Saucedo
  • Nicholas G. Murray
  • Douglas W. Powell
  • Rebecca J. Reed-JonesEmail author
Research Article


Walking and turning is a movement that places individuals with Parkinson’s disease (PD) at increased risk for fall-related injury. However, turning is an essential movement in activities of daily living, making up to 45 % of the total steps taken in a given day. Hypotheses regarding how turning is controlled suggest an essential role of anticipatory eye movements to provide feedforward information for body coordination. However, little research has investigated control of turning in individuals with PD with specific consideration for eye movements. The purpose of this study was to examine eye movement behavior and body segment coordination in individuals with PD during walking turns. Three experimental groups, a group of individuals with PD, a group of healthy young adults (YAC), and a group of healthy older adults (OAC), performed walking and turning tasks under two visual conditions: free gaze and fixed gaze. Whole-body motion capture and eye tracking characterized body segment coordination and eye movement behavior during walking trials. Statistical analysis revealed significant main effects of group (PD, YAC, and OAC) and visual condition (free and fixed gaze) on timing of segment rotation and horizontal eye movement. Within group comparisons, revealed timing of eye and head movement was significantly different between the free and fixed gaze conditions for YAC (p < 0.001) and OAC (p < 0.05), but not for the PD group (p > 0.05). In addition, while intersegment timings (reflecting segment coordination) were significantly different for YAC and OAC during free gaze (p < 0.05), they were not significantly different in PD. These results suggest individuals with PD do not make anticipatory eye and head movements ahead of turning and that this may result in altered segment coordination during turning. As such, eye movements may be an important addition to training programs for those with PD, possibly promoting better coordination during turning and potentially reducing the risk of falls.


Parkinson’s disease Turning Coordination Gait Eye tracking Gaze fixation 



The authors are thankful to the participants who volunteered for the study and the undergraduate students who assisted in data collection.

Author’s contribution

All authors contributed substantially to the project. V. Ambati and R. Reed-Jones developed and executed the project, analyzed the data and wrote the manuscript. N. Murray and F. Saucedo contributed to the design, execution, collection, and analysis of the data. D. Powell contributed to the analysis of the data and writing and reviewing of the manuscript.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • V. N. Pradeep Ambati
    • 1
  • Fabricio Saucedo
    • 2
  • Nicholas G. Murray
    • 3
  • Douglas W. Powell
    • 4
  • Rebecca J. Reed-Jones
    • 5
    Email author
  1. 1.Department of KinesiologySouthern Illinois UniversityCarbondaleUSA
  2. 2.Department of KinesiologyUniversity of Texas at El PasoEl PasoUSA
  3. 3.School of Health and KinesiologyGeorgia Southern UniversityStatesboroUSA
  4. 4.Department of Exercise ScienceUniversity of MemphisMemphisUSA
  5. 5.Department of Applied Human SciencesUniversity of Prince Edward IslandCharlottetownCanada

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