scholarly journals Flexibility of foveal attention during ocular pursuit

2011 ◽  
Vol 11 (2) ◽  
pp. 9-9 ◽  
Author(s):  
S. J. Heinen ◽  
Z. Jin ◽  
S. N. J. Watamaniuk
Keyword(s):  
Ocular Pursuit

Ocular pursuit of a target moving in an apparent circular path.

1956 ◽  
Author(s):  
Earl F., Ii Miller
Keyword(s):  
Circular Path ◽  
Ocular Pursuit

scholarly journals Adaptation in motion perception: Alteration of motion evoked by ocular pursuit

1982 ◽  
Vol 31 (3) ◽  
pp. 251-255 ◽  
Author(s):  
Joshua Bacon ◽  
Hans Wallach
Keyword(s):  
Motion Perception ◽  
Ocular Pursuit

Ocular pursuit of predicted motion trajectories

2001 ◽  
Vol 138 (3) ◽  
pp. 393-397 ◽  
Author(s):  
Kestutis Kveraga ◽  
Robert Fendrich ◽  
Howard Hughes
Keyword(s):  
Ocular Pursuit ◽  
Motion Trajectories

scholarly journals Vertical object motion during horizontal ocular pursuit: compensation for eye movements increases with presentation duration

2005 ◽  
Vol 45 (7) ◽  
pp. 845-853 ◽  
Author(s):  
Jan L. Souman ◽  
Ignace Th.C. Hooge ◽  
Alexander H. Wertheim
Keyword(s):  
Eye Movements ◽  
Object Motion ◽  
Presentation Duration ◽  
Ocular Pursuit

Volitional Versus Reflex Control in Ocular Pursuit

1995 ◽  
pp. 121-129
Author(s):  
G. R. Barnes
Keyword(s):  
Ocular Pursuit ◽  
Reflex Control

Contribution of the Cerebellar Flocculus to Gaze Control during Active Head Movements

1999 ◽  
Vol 81 (6) ◽  
pp. 3105-3109 ◽  
Author(s):  
T. Belton ◽  
R. A. McCrea
Keyword(s):  
Eye Movements ◽  
Cerebellar Cortex ◽  
Smooth Pursuit ◽  
Head Movements ◽  
Gaze Control ◽  
Smooth Pursuit Eye Movements ◽  
Ocular Pursuit ◽  
Pursuit Eye Movements ◽  
Cerebellar Flocculus ◽  
Visual Targets

Contribution of the cerebellar flocculus to gaze control during active head movements. The flocculus and ventral paraflocculus are adjacent regions of the cerebellar cortex that are essential for controlling smooth pursuit eye movements and for altering the performance of the vestibulo-ocular reflex (VOR). The question addressed in this study is whether these regions of the cerebellum are more globally involved in controlling gaze, regardless of whether eye or active head movements are used to pursue moving visual targets. Single-unit recordings were obtained from Purkinje (Pk) cells in the floccular region of squirrel monkeys that were trained to fixate and pursue small visual targets. Cell firing rate was recorded during smooth pursuit eye movements, cancellation of the VOR, combined eye-head pursuit, and spontaneous gaze shifts in the absence of targets. Pk cells were found to be much less sensitive to gaze velocity during combined eye–head pursuit than during ocular pursuit. They were not sensitive to gaze or head velocity during gaze saccades. Temporary inactivation of the floccular region by muscimol injection compromised ocular pursuit but had little effect on the ability of monkeys to pursue visual targets with head movements or to cancel the VOR during active head movements. Thus the signals produced by Pk cells in the floccular region are necessary for controlling smooth pursuit eye movements but not for coordinating gaze during active head movements. The results imply that individual functional modules in the cerebellar cortex are less involved in the global organization and coordination of movements than with parametric control of movements produced by a specific part of the body.

A Comparison of Predictive and Nonpredictive Ocular Pursuit Under Active and Passive Stimulation Conditions in Humans

1996 ◽  
Vol 6 (4) ◽  
pp. 261-276
Author(s):  
Naoki Ohashi ◽  
Graham Barnes
Keyword(s):  
Ocular Pursuit

Ocular pursuit of objects which temporarily disappear.

1930 ◽  
Vol 13 (1) ◽  
pp. 98-112 ◽  
Author(s):  
Roland C. Travis ◽  
Raymond Dodge
Keyword(s):  
Ocular Pursuit

scholarly journals The Syndrome of Infantile-Onset Saccade Initiation Delay

2013 ◽  
Vol 40 (2) ◽  
pp. 235-240 ◽  
Author(s):  
Michael S. Salman ◽  
Kristin M. Ikeda
Keyword(s):  
Developmental Delay ◽  
Medical Literature ◽  
Joubert Syndrome ◽  
Global Developmental Delay ◽  
Optokinetic Response ◽  
Motor Delay ◽  
Ocular Pursuit ◽  
English Medical Literature ◽  
Vestibulo Ocular Reflex ◽  
Motor Apraxia

Introduction:Infantile-onset saccade initiation delay (ISID), also known as congenital ocular motor apraxia, is characterized by the inability to initiate volitional horizontal saccades. Other abnormalities including developmental delay and ataxia have been reported. The frequency of these abnormalities is unknown. We performed a detailed review of the medical literature to quantify features of ISID.Methods:We searched the English medical literature for articles related to ISID from 1952 to 2010. Whenever possible, patients were excluded if they had acquired SID, Joubert syndrome or neurodegenerative conditions. The minimum prevalence was calculated for each abnormality.Results:Sixty-six articles with information on 288 patients were included in the analysis. Head thrusts were reported in 84.7%. Blinks without head thrusts were used to initiate saccades in 41%. The fast phases of the optokinetic response and vestibulo-ocular reflex were impaired in 69.8% and 34.4% respectively. Smooth ocular pursuit was abnormal in 33%. Global developmental delay occurred in 41.3%, speech or language delay in 36.5%, cognitive delay in 17%, hypotonia in 35.8%, motor delay in 48.6%, and ataxia/clumsiness in 49.3% of patients. Neuroimaging was performed on 197 patients and was normal in 39.1%. Abnormalities involved the cerebellum (24.9%), cerebrum (15.7%), other infratentorial structures (11.7%), and corpus callosum (6.1%).Conclusions:Infantile-onset saccade initiation delay is frequently associated with deficits in reflexive saccades and less frequently with impaired smooth ocular pursuit. Developmental delay, hypotonia, and ataxia occur frequently in ISID, suggesting more global brain impairment and not just a saccadic disorder.

Sign in / Sign up

Export Citation Format

Share Document