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To the Editor.
—In connection with the paper Dissociated Nystagmus with Lesions in the Posterior Fossa (Cogan, D. G.: Arch Ophthal 70:361, 1963), it may be of note that we found an area in the brain stem of a macaque, which, when stimulated with four volts, a duration of one millisecond, and a frequency of 100 cycles per second, produced homolateral monocular nystagmus. This nystagmus was of high frequency and low amplitude. Moving the monopolar electrode one millimeter to either side of the stimulated area in a dorsal-ventral direction eliminated the response.In brief, we were able to obtain monocular nystagmus from brain-stem stimulation. The exact locus is not known.
Jampel RS. EXPERIMENTAL MONOCULAR NYSTAGMUS IN THE MONKEY. Arch Ophthalmol. 1963;70(4):587. doi:10.1001/archopht.1963.00960050589030