Visual Exploration While Walking With and Without Visual Cues in Parkinson's Disease: Freezer Versus Non-Freezer.
Lisa Graham, Jordan Armitage, Rodrigo Vitorio and 8 others
PMID 37772512WHAT IT FOUND
Visual cues like floor lines improved gait in people with Parkinson's, regardless of whether they had freezing of gait.
Eye-tracking showed cues made people look more frequently but with slower, shorter eye movements, suggesting the brain works harder to focus on the cue.
Key findings
01Visual cues significantly increased stride length and improved foot strike angle and stride time in all groups, including those with and without freezing of gait.
02Cues changed how people looked at the environment, increasing how often they moved their eyes while reducing the speed and distance of those movements.
03Changes in eye movement patterns were linked to gait improvements in people with Parkinson's, but not in healthy controls, suggesting different underlying mechanisms.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTs
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What it does not show
The study only looked at the immediate effect of cues in a laboratory setting, so it is unknown if these benefits last when patients use cues at home over time. The eye-tracker recorded where people looked but not what they were actually seeing or processing in their brains, so the exact cognitive mechanism remains unclear. Participants had mild to moderate Parkinson's (Hoehn and Yahr stage II-III) and could walk unaided, so results may not apply to those with more advanced disease. The study did not measure turning, only straight-line walking, so the effect of cues on turning—which is a common trigger for freezing—was not assessed.
Declared interests
The authors declared no conflicts of interest. The study was funded by the Parkinson's Foundation and the National Institutes of Health. Some authors were supported by studentships involving Northumbria University and private companies (Head Diagnostics, Senaptec Inc.).
The easy way to misread this
Do not assume that because eye movement patterns changed, the cues worked by improving vision or attention in a general sense. The changes were specific to the task of walking with cues, and the study did not prove that training eye movements separately would improve gait.