scholarly journals Narrowing wide-field optic flow affects treadmill gait in left-sided Parkinson's disease

2011 ◽  
Vol 27 (4) ◽  
pp. 580-581 ◽  
Author(s):  
Anouk van der Hoorn ◽  
At L. Hof ◽  
Klaus L. Leenders ◽  
Bauke M. de Jong
Keyword(s):  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Optic Flow ◽  
Wide Field

scholarly journals A Manipulation of Visual Feedback during Gait Training in Parkinson's Disease

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Quincy J. Almeida ◽  
Haseel Bhatt
Keyword(s):  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Optic Flow ◽  
Visual Cues ◽  
Step Length ◽  
Gait Training ◽  
Control Group ◽  
Training Interventions ◽  
Visual Cueing ◽  
Walking Velocity

Visual cues are known to improve gait in Parkinson's disease (PD); however, the contribution of optic flow continues to be disputed. This study manipulated transverse line cues during two gait training interventions (6 weeks). PD subjects (N=42) were assigned to one of three groups: treadmill (TG), overground (OG), or control group (CG). Participants walked across lines placed on either treadmills or 16-meter carpets, respectively. The treadmill (TG) offered a reduced dynamic flow from the environment, while lines presented on the ground (OG) emphasized optic flow related to the participant's own displacement. Both interventions significantly improved (and maintained through retention period) step length, thus improving walking velocity. Only the OG improved in the TUG test, while only the TG showed hints of improving (and maintaining) motor symptoms. Since gait improvements were found in both training groups, we conclude that by reducing optic flow, gait benefits associated with visual cueing training can still be achieved.

scholarly journals Effects of Parkinson’s disease on optic flow perception for heading direction during navigation

2014 ◽  
Vol 232 (4) ◽  
pp. 1343-1355 ◽  
Author(s):  
Cheng-Chieh Lin ◽  
Robert C. Wagenaar ◽  
Daniel Young ◽  
Elliot L. Saltzman ◽  
Xiaolin Ren ◽  
...  
Keyword(s):  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Optic Flow ◽  
Heading Direction

scholarly journals Wide-field mosaics of the corneal subbasal nerve plexus in Parkinson’s disease using in vivo confocal microscopy

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Reza A. Badian ◽  
Stephan Allgeier ◽  
Fabio Scarpa ◽  
Mattias Andréasson ◽  
Andreas Bartschat ◽  
...  
Keyword(s):  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Confocal Microscopy ◽  
Cellular Level ◽  
Nerve Plexus ◽  
Control Group ◽  
Wide Field ◽  
Image Size ◽  
Subbasal Nerve Plexus

AbstractIn vivo confocal microscopy (IVCM) is a non-invasive imaging technique facilitating real-time acquisition of images from the live cornea and its layers with high resolution (1–2 µm) and high magnification (600 to 800-fold). IVCM is extensively used to examine the cornea at a cellular level, including the subbasal nerve plexus (SBNP). IVCM of the cornea has thus gained intense interest for probing ophthalmic and systemic diseases affecting peripheral nerves. One of the main drawbacks, however, is the small field of view of IVCM, preventing an overview of SBNP architecture and necessitating subjective image sampling of small areas of the SBNP for analysis. Here, we provide a high-quality dataset of the corneal SBNP reconstructed by automated mosaicking, with an average mosaic image size corresponding to 48 individual IVCM fields of view. The mosaic dataset represents a group of 42 individuals with Parkinson’s disease (PD) with and without concurrent restless leg syndrome. Additionally, mosaics from a control group (n = 13) without PD are also provided, along with clinical data for all included participants.

The effects of visual rhythms and optic flow on stride patterns of patients with Parkinson's disease

2006 ◽  
Vol 12 (1) ◽  
pp. 21-27 ◽  
Author(s):  
E. van Wegen ◽  
I. Lim ◽  
C. de Goede ◽  
A. Nieuwboer ◽  
A. Willems ◽  
...  
Keyword(s):  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Optic Flow

scholarly journals Evaluating the Contributions of Dynamic Flow to Freezing of Gait in Parkinson's Disease

2010 ◽  
Vol 2010 ◽  
pp. 1-7 ◽  
Author(s):  
Chad A. Lebold ◽  
Q. J. Almeida
Keyword(s):  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Optic Flow ◽  
Visual Cues ◽  
Freezing Of Gait ◽  
Underlying Mechanism ◽  
Step Length ◽  
Double Support ◽  
Double Support Time ◽  
Conscious Control

Although visual cues can improve gait in Parkinson's disease (PD), their underlying mechanism is poorly understood. Previous research suggests that cues contribute optical flow that is essential to elicit gait improvement. The present study manipulated how optic flow was provided, and how this might influence freezing of gait (FOG) in PD. Therefore, three groups; 15 PD FOG, 16 PD non-FOG, and 16 healthy controls were tested in 3 narrow doorway conditions; baseline (Narrow), ground lines (Ground), and laser (Laser). Step length indicated that the PD FOG group was only able to improve with ground lines, while the laser increased gait variability and double support time. These results suggest that optic flow in itself is not enough to elicit gait improvement in PD. When PD patients use visual cues, gait becomes less automatically controlled and hence preplanned conscious control may be an important factor contributing to gait improvement.

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