Machine Learning on the Video Basis of Slow Pursuit Eye Movements Can Predict Symptom Development in Parkinson’s Patients

2015 ◽  
pp. 268-276 ◽  
Author(s):  
Andrzej W. Przybyszewski ◽  
Stanislaw Szlufik ◽  
Justyna Dutkiewicz ◽  
Piotr Habela ◽  
Dariusz M. Koziorowski
Keyword(s):  
Machine Learning ◽  
Eye Movements ◽  
Symptom Development ◽  
Pursuit Eye Movements

scholarly journals Role of Primate Cerebellar Hemisphere in Voluntary Eye Movement Control Revealed by Lesion Effects

2009 ◽  
Vol 101 (2) ◽  
pp. 934-947 ◽  
Author(s):  
Masafumi Ohki ◽  
Hiromasa Kitazawa ◽  
Takahito Hiramatsu ◽  
Kimitake Kaga ◽  
Taiko Kitamura ◽  
...  
Keyword(s):  
Eye Movements ◽  
Eye Movement ◽  
Smooth Pursuit ◽  
Movement Control ◽  
Cerebellar Hemisphere ◽  
Target Velocity ◽  
Eye Movement Control ◽  
Pursuit Eye Movements ◽  
Catch Up

The anatomical connection between the frontal eye field and the cerebellar hemispheric lobule VII (H-VII) suggests a potential role of the hemisphere in voluntary eye movement control. To reveal the involvement of the hemisphere in smooth pursuit and saccade control, we made a unilateral lesion around H-VII and examined its effects in three Macaca fuscata that were trained to pursue visually a small target. To the step (3°)-ramp (5–20°/s) target motion, the monkeys usually showed an initial pursuit eye movement at a latency of 80–140 ms and a small catch-up saccade at 140–220 ms that was followed by a postsaccadic pursuit eye movement that roughly matched the ramp target velocity. After unilateral cerebellar hemispheric lesioning, the initial pursuit eye movements were impaired, and the velocities of the postsaccadic pursuit eye movements decreased. The onsets of 5° visually guided saccades to the stationary target were delayed, and their amplitudes showed a tendency of increased trial-to-trial variability but never became hypo- or hypermetric. Similar tendencies were observed in the onsets and amplitudes of catch-up saccades. The adaptation of open-loop smooth pursuit velocity, tested by a step increase in target velocity for a brief period, was impaired. These lesion effects were recognized in all directions, particularly in the ipsiversive direction. A recovery was observed at 4 wk postlesion for some of these lesion effects. These results suggest that the cerebellar hemispheric region around lobule VII is involved in the control of smooth pursuit and saccadic eye movements.

scholarly journals The Impact of Neonatal Morbidities on Smooth Pursuit Eye Movements in Very Preterm Infants

2011 ◽  
Vol 70 ◽  
pp. 352-352 ◽  
Author(s):  
K Strand Brodd ◽  
K Rosander ◽  
H Grönqvist ◽  
G Holmström ◽  
B Strömberg ◽  
...  
Keyword(s):  
Eye Movements ◽  
Preterm Infants ◽  
Smooth Pursuit ◽  
Smooth Pursuit Eye Movements ◽  
Very Preterm Infants ◽  
Very Preterm ◽  
Pursuit Eye Movements ◽  
The Impact

Schizotypy and smooth pursuit eye movements as potential endophenotypes of obsessive-compulsive disorder

2018 ◽  
Vol 269 (2) ◽  
pp. 235-243 ◽  
Author(s):  
Katharina Bey ◽  
Inga Meyhöfer ◽  
Leonhard Lennertz ◽  
Rosa Grützmann ◽  
Stephan Heinzel ◽  
...  
Keyword(s):  
Eye Movements ◽  
Obsessive Compulsive Disorder ◽  
Smooth Pursuit ◽  
Smooth Pursuit Eye Movements ◽  
Obsessive Compulsive ◽  
Compulsive Disorder ◽  
Pursuit Eye Movements

Vision without Contours: Study of Visual Information from Ordinal Stimulation

1968 ◽  
Vol 26 (2) ◽  
pp. 335-351 ◽  
Author(s):  
Gunnar Johansson
Keyword(s):  
Eye Movements ◽  
Visual Information ◽  
Sensitivity Threshold ◽  
Continuous Change ◽  
Stimulus Motion ◽  
Pursuit Eye Movements ◽  
Illuminance Level ◽  
Sinusoidal Pattern ◽  
Moving Pattern ◽  
Sinusoidal Function

Continuous change of illuminance over retinal area in accordance with the sinusoidal function was studied as a stimulus for the human visual system. Its efficiency in controlling pursuit eye movements was compared with that of a stepwise luminance function (square wave). Such distributions of luminance were generated on a cathode ray screen (wavelength at the eye 9° and 3°) and were given a small translatory motion (2° – 12′). Ss were instructed to follow the moving pattern with pursuit eye movements. There is no difference in performance between the two types of brightness distributions. A stimulus motion of 24′ was sufficient to produce full evidence of eye tracking in all Ss also from the contour-free sinusoidal pattern. This means that the brightness change in every point of the CRT screen was far below the retinal sensitivity threshold at the illuminance level used. Thus a summation effect occurs. This was taken as a support for an hypothesis about “ordinal” stimulation. Arguments from modern neurophysiology are introduced and yield further support for the conclusion.

Effect of amphetamine on saccadic and smooth pursuit eye movements

1983 ◽  
Vol 79 (2-3) ◽  
pp. 190-192 ◽  
Author(s):  
G. Tedeschi ◽  
P. R. M. Bittencourt ◽  
A. T. Smith ◽  
A. Richens
Keyword(s):  
Eye Movements ◽  
Smooth Pursuit ◽  
Smooth Pursuit Eye Movements ◽  
Pursuit Eye Movements

Smooth-pursuit eye movements, and diazepam, CPZ, and secobarbital

1975 ◽  
Vol 44 (2) ◽  
pp. 111-115 ◽  
Author(s):  
Philip S. Holzman ◽  
Deborah L. Levy ◽  
Eberhard H. Uhlenhuth ◽  
Leonard R. Proctor ◽  
Daniel X. Freedman
Keyword(s):  
Eye Movements ◽  
Smooth Pursuit ◽  
Smooth Pursuit Eye Movements ◽  
Pursuit Eye Movements
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