Information processing by parafoveal cells in the primate nucleus of the optic tract.

Information processing by parafoveal cells in the primate nucleus of the optic tract. Research Abstract Details 

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Information processing by parafoveal cells in the primate nucleus of the optic tract. Abstract Text:

V E Das,J R Economides,S Ono,M J Mustari,

We recorded from single units in the pretectal nucleus of the optic tract (NOT) of the nonhuman primate. Specifically, we examined units that are modulated during smooth tracking of a small laser spot against a dark background. We used a nonlinear optimization procedure to determine whether the unit responses of these parafoveal cells are better described by a model that incorporates retinal error motion parameters or by a model that incorporates eye motion parameters. Our main finding was that all the cells in our sample group were better fit with a three-component model that incorporated retinal error motion parameters of position, velocity and acceleration (average coefficient of determination = 0.84) than a model that used position, velocity and acceleration components of eye motion (average coefficient of determination = 0.68). Other analyses involved comparison of goodness of fit between the three-component retinal error model and two-component retinal error models that excluded position or acceleration related terms. We found that there was a statistically significant degradation in the fit when position and acceleration related terms were dropped from the retinal error based model (P<0.05). Unit data from experiments in which the laser spot was extinguished for a brief period of time during tracking showed that the unit response was decreased following the target blink. We conclude on the basis of this and previous experimental data and our dynamic modeling approach that the parafoveal cells in the NOT primarily encode retinal error motion. Further they encode position, velocity and acceleration components of retinal error that could be used by other downstream structures for synthesis of a smooth-pursuit eye movement.

Information processing by parafoveal cells in the primate nucleus of the optic tract. Publishing Authors By Initials

VE Das,JR Economides,S Ono,MJ Mustari,

For similar nervous system: neural pathways: afferent pathways: visual pathways research abstracts see: nervous system: neural pathways: afferent pathways: visual pathways research

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Information processing by parafoveal cells in the primate nucleus of the optic tract. Journal Published:

PUBLICATION TYPE: Research Support, U.S. Gov't,

Journal: Experimental brain research. Experimentelle Hirnfo

VOLUME: 140

Page Numbers: 301-10

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ISSN: 0014-4819

DAY: 15

MONTH: Oct

YEAR: 2001

Information processing by parafoveal cells in the primate nucleus of the optic tract. Information

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LANGUAGE: eng

NlmUniqueID: 43312

Information processing by parafoveal cells in the primate nucleus of the optic tract. Keywords Mesh Terms:

KEYWORDS: Visual Pathways

MESH TERMS: physiology

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Grant and Affiliation Information for Information processing by parafoveal cells in the primate nucleus of the optic tract.

AFFILIATION: Division of Visual Sciences, Yerkes Regional Primate Research Center, Emory University, Atlanta, GA 30322, USA. vdas@rmy.emory.edu

Country: Germany

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MEDLINETA: Exp Brain Res

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