نتایج جستجو برای: smooth pursuit

تعداد نتایج: 133351  

Journal: :Vision Research 2014
Mark S. Bolding Adrienne C. Lahti David White Claire Moore Demet Gurler Timothy J. Gawne Paul D. Gamlin

Previous studies have shown that smooth pursuit eye movements are impaired in patients with schizophrenia. However, under normal viewing conditions, targets move not only in the frontoparallel plane but also in depth, and tracking them requires both smooth pursuit and vergence eye movements. Although previous studies in humans and non-human primates suggest that these two eye movement subsystem...

Journal: :The American journal of psychiatry 2004
Jason R Tregellas Jody L Tanabe David E Miller Randal G Ross Ann Olincy Robert Freedman

OBJECTIVE Smooth pursuit eye movements are abnormal in patients with schizophrenia. The investigators used functional magnetic resonance imaging (fMRI) to compare brain hemodynamic response during a smooth pursuit eye movement task in patients with schizophrenia and healthy comparison subjects. METHOD Fourteen patients with schizophrenia and 14 healthy comparison subjects performed a smooth p...

Journal: :Journal of neurophysiology 1988
M J Mustari A F Fuchs J Wallman

1. The anatomical connections of the dorsolateral pontine nucleus (DLPN) implicate it in the production of smooth-pursuit eye movements. It receives inputs from cortical structures believed to be involved in visual motion processing (middle temporal cortex) or motion execution (posterior parietal cortex) and projects to the flocculus of the cerebellum, which is involved in smooth pursuit. To de...

Journal: :Journal of neurophysiology 2005
Gunnar Blohm Marcus Missal Philippe Lefèvre

When objects move in our environment, the orientation of the visual axis in space requires the coordination of two types of eye movements: saccades and smooth pursuit. The principal input to the saccadic system is position error, whereas it is velocity error for the smooth pursuit system. Recently, it has been shown that catch-up saccades to moving targets are triggered and programmed by using ...

2010
Gunnar Blohm Philippe Lefèvre

6 7 Gunnar Blohm, Philippe Lefèvre 8 9 Centre for Neuroscience Studies, Department of Physiology and Faculty of Arts & 10 Science, Queen’s University, Kingston, Ontario, Canada 11 Centre for Systems Engineering and Applied Mechanics (CESAME) and Institute of 12 Neuroscience (IoNS), Université catholique de Louvain, Louvain-la-Neuve, 13 Belgium 14 15 16 17 Corresponding author: Dr. Gunnar Blohm ...

Journal: :Vision Research 1998
Stephen J Heinen Scott N.J Watamaniuk

When viewing a moving object, details may appear blurred if the object's motion is not compensated for by the eyes. Smooth pursuit is a voluntary eye movement that is used to stabilize a moving object. Most studies of smooth pursuit have used small, foveal targets as stimuli (e.g. Lisberger SG and Westbrook LE. J Neurosci 1985;5:1662-1673.). However, in the laboratory, smooth pursuit is poorer ...

Journal: :Journal of neurology, neurosurgery, and psychiatry 1995
K Vahedi S Rivaud P Amarenco C Pierrot-Deseilligny

The horizontal saccade, smooth pursuit, and vestibulo-ocular reflex gains were recorded in 19 patients with cerebellar infarction documented with MRI, and in a group of control subjects. Bilateral saccade hypometria and a decrease in ipsilateral smooth pursuit gain were found only in patients with a lesion affecting the posterior vermis. These results in humans support experimental findings sug...

2016
Nathaniel Lizak Meaghan Clough Lynette Millist Tomas Kalincik Owen B. White Joanne Fielding

BACKGROUND Multiple sclerosis (MS) is a diffuse disease that disrupts wide-ranging cerebral networks. The control of saccades and smooth pursuit are similarly dependent upon widespread networks, with the assessment of pursuit offering an opportunity to examine feedback regulation. We sought to characterize pursuit deficits in MS and to examine their relationship with disease duration. METHODS...

Journal: :Neuron 2005
Julio C. Martinez-Trujillo

In order to produce kinematically efficient behavior when dealing with the noncommutativity of rotations, the oculomotor system has developed strategies such as the half-angle rule. In this issue of Neuron, Ghasia and Angelaki demonstrate that during smooth pursuit eye movements the half-angle rule is implemented by the mechanical properties of the eye plant.

Journal: :Journal of neurophysiology 1999
K C Engel J H Anderson J F Soechting

Results from studies of oculomotor tracking in one dimension have indicated that saccades are driven primarily by errors in position, whereas smooth pursuit movements are driven primarily by errors in velocity. To test whether this result generalizes to two-dimensional tracking, we asked subjects to track a target that moved initially in a straight line then changed direction. We found that the...

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