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Optokinetic nystagmus (OKN)
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"stare" OKN vs. "look" OKN
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Resolution required to discriminate OKN direction?
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For OKN amplitude of 1 degree, an image plane rotation
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of 1 degree produces and endpoint shift of 1 arc min
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Resolution of 1990's ISCAN technology: ~10 arc min at best
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