Results 241 to 250 of about 14,972 (291)
Trochlear unit activity during ocular convergence
Journal of Neurophysiology, 1991 1. Ocular convergence is usually accompanied by excyclotorsion of the eyes. Furthermore, the magnitude of cyclotorsion is dependent on the elevation of the eyes. The reason for this excyclotorsion during convergence is not understood. 2. Excyclotorsion could be produced by either increased activity in the inferior oblique muscle or decreased activity ...
L E, Mays +3 more
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Abducens internuclear neurons carry an inappropriate signal for ocular convergence
Journal of Neurophysiology, 1989 1. Single-unit recording studies in alert Rhesus monkeys characterized the vergence signal carried by abducens internuclear neurons. These cells were identified by antidromic activation and the collision of spontaneous with antidromic action potentials.
P D, Gamlin, J W, Gnadt, L E, Mays
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Role of ocular convergence in the Romberg quotient
Gait & Posture, 2008The Romberg test generally shows that postural stability is better with eyes open than eyes closed; the Romberg quotient (RQ) is generally 2.5. This study examines the possible role of vergence angle on the RQ. Eighteen young (25.3+/-2.7 years) and 17 old (61.6+/-4.4 years) subjects were required to fixate a target at 40 cm or at 200 cm inducing ...
Thanh-Thuan, Lê, Zoï, Kapoula
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Relationship between mandibular deviation and ocular convergence
Journal of Clinical Pediatric Dentistry, 2005Recent studies have confirmed the relationship between head posture, mandibular position and visual focusing. A case-controlled study was conducted to assess the occurrence of ocular convergence defects between subjects with functional mandibular latero-deviation and healthy subjects in pediatric age.
MONACO, ANNALISA +5 more
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Changes in corneal curvature following ocular convergence
Vision Research, 1965Abstract A method is described for the measurement of the radii of corneal curvature in the vertical and horizontal meridians. It was applied to the study of the change in curvature during the convergence of the ocular axes from an approximately primary position to a binocular fixation spot situated at some 5 metre-angles: (a) the eye under test ...
B, Löpping, R A, Weale
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Labyrinthine And Somatosensory Convergence Upon Vestibulo-Ocular Units
Acta Oto-Laryngologica, 1978The vestibular nuclei were investigated in 18 adult cats. Vestibulo-oculo-motor neurons were identified by antidromic stimulation of the ascending medial longitudinal fasciculus (MLF). The neurons were subjected to various stimuli: vestibular, neck, forelimb and hindlimb nerve stimulation on both sides.
A M, Rubin +4 more
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Extrastriate cortical neurons correlated with ocular convergence in the cat
Neuroscience Research, 1993Responses of neurons in the lateral suprasylvian area to visual stimulation in association with ocular convergence were studied in eight alert cats trained to track a visual target moving in depth. Activities of 18 (3%) of 659 cells were related to ocular convergence.
M, Takagi, H, Toda, T, Bando
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Canal-Otolith Convergence on Cat Ocular Motoneurons
1979Publisher Summary This chapter demonstrates the central processing of otolithic information, by comparing motoneuron output with primary otolith input. It focuses on the importance of canal-otolith convergence for extending the frequency response characteristics of motoneurons involved primarily, but not exclusively, in vertical/rotatory eye ...
W, Precht, J H, Anderson, R H, Blanks
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Cortical Indices of Impaired Ocular Accommodation and Associated Convergence Mechanisms
American journal of optometry and physiological optic, 1984ABSTRACT The accommodative and fusional vergence mechanisms were examined electrophysiologically in a juvenile suffering from a severe reduction in focusing ability. We used the visually evoked response (VER) to diagnose the accommodation‐vergence insufficiency.
J V, Lovasik, R, Wiggins
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The effect of convergence on the vestibulo-ocular reflex and implications for perceived movement
Vision Research, 1982The apparent motion of a fixated stimulus during head translation in the dark was found to depend on the magnitude of the vestibulo-ocular reflex (VOR). Absolute convergence level determines VOR magnitude and thereby influences apparent motion during head movement by determining the magnitude and direction of the pursuit effort required to maintain ...
R B, Post, H W, Leibowitz
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