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What does RPN stand for?

RPN stands for reversed postoptokinetic nystagmus


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According to Cohen et al. (6), activation of this system takes about 5 to 10 s in the monkey. Its manifestation is the so-called positive opto- kinetic af ternystagmus (OKAN), observed when optokineti'c istimulation is suddenly terminated by darkness. L n spite of the absence of visual sti- muli, nystagmus continues to be driven by the inner integrator, the activity of which decays during 20-60 s (6). The positive OKAN is follo- wed after a brief interval by a negative OKAN (22), more appropriately called reversed postoptokinetic nystagmus.
Unit activity changes accompanying the optokinetic nystagmus (OKN) and reversed postoptokinetic nystagmus (RPN) in the rabbit were examined in 180 vestibular and floccular neurons. After initial charging of the RPN generator by 60-min optokinetic stimulation, a sequence of 1-min optokinetic stimulation (OKN) followed by 1-min darkness (RPN) and 1-min illumination of the stationary optokinetic drum (L), was cycled while corresponding unit activity changes were recorded during 3--5 cycles and evaluated with a computer.