Functional correlates of optic flow motion processing in Parkinson's disease
Deepti Putcha1, Robert S Ross2, Maya L Rosen1
1Department of Psychology, Center for Memory and Brain, Boston University Boston, MA, USA ; Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital Boston, MA, USA.
Frontiers in Integrative Neuroscience
|July 30, 2014
Summary
Parkinson's disease (PD) impairs optic flow perception due to reduced neural activity in visual motion and visuo-vestibular areas. This neural deficit is linked to disease severity, affecting self-motion and spatial cognition.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Neuroimaging
Background:
- Optic flow, the visual motion perceived during self-movement, is crucial for self-motion sense, posture, gait, and visuospatial cognition.
- A specific neural network, including visual motion areas (V6, V3A, MT+) and visuo-vestibular areas (PIVC, CSv), processes optic flow for egomotion perception.
- Individuals with Parkinson's disease (PD) exhibit known deficits in optic flow perception and visuospatial cognition compared to healthy controls.
Purpose of the Study:
- To investigate the neural underpinnings of impaired optic flow perception in non-demented individuals with Parkinson's disease (PD) using functional magnetic resonance imaging (fMRI).
- To compare neural activity in the optic flow network between PD patients and age- and education-matched controls (MC) during optic flow perception tasks.
Main Methods:
- Functional magnetic resonance imaging (fMRI) was employed on 40 non-demented participants (23 PD, 17 MC).
- Participants passively viewed simulated optic flow motion and random motion stimuli during fMRI scanning.
- Neural activity was analyzed within the established optic flow network, focusing on visual motion and visuo-vestibular regions.
Main Results:
- Healthy controls (MC) demonstrated robust activation across the optic flow network, indicating intact neural processing in aging.
- Parkinson's disease (PD) participants showed significantly diminished neural activity compared to MC, particularly in the visual motion area MT+ and the visuo-vestibular region CSv.
- Reduced activation in the visuo-vestibular region CSv was correlated with the severity of Parkinson's disease.
Conclusions:
- Impaired optic flow perception and associated visuospatial deficits in PD likely stem from compromised neural processing within specific visual motion and visuo-vestibular brain regions.
- The findings highlight the role of the optic flow network in PD and suggest that neural alterations in areas like MT+ and CSv contribute to motor and cognitive symptoms.
- Abnormalities in visuo-vestibular processing, as indicated by CSv activity, may be a key neural correlate of optic flow deficits in Parkinson's disease.
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