Visual thresholds to low‐contrast pattern displacement, color contrast, and luminance contrast stimuli in Parkinson's disease
Identifieur interne : 005A63 ( Main/Exploration ); précédent : 005A62; suivant : 005A64Visual thresholds to low‐contrast pattern displacement, color contrast, and luminance contrast stimuli in Parkinson's disease
Auteurs : Haug [Allemagne] ; Claudia Trenkwalder [Allemagne] ; Geoffrey B. Arden [Royaume-Uni] ; Wolfgang H. Oertel [Allemagne] ; Walter Paulus [Allemagne]Source :
- Movement Disorders [ 0885-3185 ] ; 1994.
English descriptors
- KwdEn :
- Aged, Color Perception (physiology), Color contrast, Contrast Sensitivity (physiology), Displacement stimuli, Dopamine (physiology), Female, Humans, Luminance contrast, Male, Middle Aged, Motion Perception (physiology), Parkinson Disease (physiopathology), Parkinson's disease, Pattern Recognition, Visual (physiology), Psychophysics, Retina (physiopathology), Sensory Thresholds (physiology), Visual Cortex (physiopathology), Visual Perception (physiology), Visual thresholds.
- MESH :
- chemical , physiology : Dopamine.
- physiology : Color Perception, Contrast Sensitivity, Motion Perception, Pattern Recognition, Visual, Sensory Thresholds, Visual Perception.
- physiopathology : Parkinson Disease, Retina, Visual Cortex.
- Aged, Female, Humans, Male, Middle Aged, Psychophysics.
Abstract
We used the computerized Moorfield Vision System to demonstrate specific increases in various perceptual visual thresholds in idiopathic Parkinson's syndrome. Fifteen patients were compared to 13 age‐matched normals. Motion detection was impaired maximally (2p < 0.01 and better in two‐tailed t test) at luminance contrasts of 3–7%. Stimulus was an achromatic vertical 4 cycles/°sine wave grating subtending 3° × 2°, centered 5° in the nasal field and oscillating at 5 Hz. In addition, stationary color and luminance contrast thresholds were tested with flashed display of 5° × 6° random letters, which were presented for 200 ms (color) and 50 ms (achromatic). Color discrimination was impaired in the tritan axis only (2p < 0.05 in two‐tailed t test). All achromatic stimuli–luminance increments, decrements, and phase reversing stimuli–were equally well seen by patients and controls. We conclude that the dopaminergic deficit of retinal amacrine cells in Parkinson patients can be monitored by combined low‐contrast and motion (displacement) stimuli. Future studies will determine if moving colored targets are more effective in discriminating patients from controls than are the achromatic gratings used in this work.
Url:
DOI: 10.1002/mds.870090510
Affiliations:
- Allemagne, Royaume-Uni
- Angleterre, Basse-Saxe, Bavière, District de Haute-Bavière, Grand Londres
- Göttingen, Londres, Munich
- Université Louis-et-Maximilien de Munich
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Le document en format XML
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<front><div type="abstract" xml:lang="en">We used the computerized Moorfield Vision System to demonstrate specific increases in various perceptual visual thresholds in idiopathic Parkinson's syndrome. Fifteen patients were compared to 13 age‐matched normals. Motion detection was impaired maximally (2p < 0.01 and better in two‐tailed t test) at luminance contrasts of 3–7%. Stimulus was an achromatic vertical 4 cycles/°sine wave grating subtending 3° × 2°, centered 5° in the nasal field and oscillating at 5 Hz. In addition, stationary color and luminance contrast thresholds were tested with flashed display of 5° × 6° random letters, which were presented for 200 ms (color) and 50 ms (achromatic). Color discrimination was impaired in the tritan axis only (2p < 0.05 in two‐tailed t test). All achromatic stimuli–luminance increments, decrements, and phase reversing stimuli–were equally well seen by patients and controls. We conclude that the dopaminergic deficit of retinal amacrine cells in Parkinson patients can be monitored by combined low‐contrast and motion (displacement) stimuli. Future studies will determine if moving colored targets are more effective in discriminating patients from controls than are the achromatic gratings used in this work.</div>
</front>
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<name sortKey="Trenkwalder, Claudia" sort="Trenkwalder, Claudia" uniqKey="Trenkwalder C" first="Claudia" last="Trenkwalder">Claudia Trenkwalder</name>
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<country name="Royaume-Uni"><region name="Angleterre"><name sortKey="Arden, Geoffrey B" sort="Arden, Geoffrey B" uniqKey="Arden G" first="Geoffrey B." last="Arden">Geoffrey B. Arden</name>
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