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Research Projects
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Electrical stimulation of the Nucleus Reticularis Gigantocellularis
Electrical stimulation of the Nucleus Reticularis Gigantocellularis was used to test the predictions of a gaze model. On the left simulations of eye (A), gaze (B) and head (C) velocity are shown during "control" movements (orange) and during simulated NRG stimulation (blue). On the right, mean (+/- SD) eye (D), gaze (E), and head (F) velocity are plotted as functions of time for two sets of movements: Control gaze shifts to briefly flashed visual targets (orange), and similar trials during which the right NRG was electrically stimulated. Data were consistent with the predictions of the model. More info...
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Modeling the Gaze Control System
Using control systems modeling techniques, the following hypothesis has been developed into a gaze system model (Freedman, 2001). Hypothesis: a vectorial signal of desired gaze displacement is derived from the location of the active population in the deeper layers of the superior colliculus. This signal is subsequently decomposed into eye and head desired displacement signals which are used as input to separate controllers. A dynamic signal of horizontal head velocity inhibits the gain of the exponential function describing the horizontal eye burst generator. More info...
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Neural Control of Eye-head Movements
Maintaining our sense of the world around us and being able to interact with our environment depends in large part on the nervous system’s ability to perform a few basic functions. We must be able to gather accurate sensory information about our surroundings, distinguish our movements from the movements of objects in the world, and coordinate our own movements in order to orient, and navigate smoothly through a complex setting. More info...
