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      Neural mechanisms of oculomotor abnormalities in the infantile strabismus syndrome

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          Abstract

          <p class="first" id="d9396762e249">Infantile strabismus is characterized by numerous visual and oculomotor abnormalities. Recently nonhuman primate models of infantile strabismus have been established, with characteristics that closely match those observed in human patients. This has made it possible to study the neural basis for visual and oculomotor symptoms in infantile strabismus. In this review, we consider the available evidence for neural abnormalities in structures related to oculomotor pathways ranging from visual cortex to oculomotor nuclei. These studies provide compelling evidence that a disturbance of binocular vision during a sensitive period early in life, whatever the cause, results in a cascade of abnormalities through numerous brain areas involved in visual functions and eye movements. </p>

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          Most cited references173

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          Eye movements evoked by collicular stimulation in the alert monkey.

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            The development of ocular dominance columns in normal and visually deprived monkeys.

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              Population coding of saccadic eye movements by neurons in the superior colliculus.

              The deeper layers of the superior colliculus are involved in the initiation and execution of saccadic (high velocity) eye movements. A large population of coarsely tuned collicular neurons is active before each saccade. The mechanisms by which the signals that precisely control the direction and amplitude of a saccade are extracted from the activity of the population are unknown. It has been assumed that the exact trajectory of a saccade is determined by the activity of the entire population and that information is not extracted from only the most active cells in the population at a subsequent stage of neural processing. The trajectory of a saccade could be based on vector summation of the movement tendencies provided by each member of the population of active neurons or be determined by a weighted average of the vector contributions of each neuron in the active population. Here we present the results of experiments in which a small subset of the active population was reversibly deactivated with lidocaine. These results are consistent with the predictions of the latter population-averaging hypothesis and support the general idea that the direction, amplitude and velocity of saccadic eye movements are based on the responses of the entire population of cells active before a saccadic eye movement.
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                Author and article information

                Journal
                Journal of Neurophysiology
                Journal of Neurophysiology
                American Physiological Society
                0022-3077
                1522-1598
                July 2017
                July 2017
                : 118
                : 1
                : 280-299
                Affiliations
                [1 ]Washington National Primate Research Center, University of Washington, Seattle, Washington;
                [2 ]Department of Ophthalmology, University of Washington, Seattle, Washington;
                [3 ]Department of Biological Structure, University of Washington, Seattle, Washington; and
                [4 ]Seattle Children’s Hospital, Seattle, Washington
                Article
                10.1152/jn.00934.2016
                5498729
                28404829
                9b541f87-c518-4f83-9629-347dd1453812
                © 2017
                History

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