Abstract
The author has studied on the changes of nystagmus caused by ultrasound-produced focal lesion in the MLF of the rabbit. Results obtained are summarized as follows:(1) A diminution of adducting movements on optokinetic and vesti-bular nystagmus was observed by destroying the MLF at the level of the rostral portion of IV ventricle, while a diminution of abducting movements on vestibular nystagmus, on the contrary, was observed by destroying the MLF below the level of the trochlear nuclei.(2) In one rabbit, in which MLF was transected just below the level of the trochlear nuclei, the so-called convergence nystagmus was transitorily observed.(3) In the author's opinion, the difference between author's result and that of Bender & Weinstein (1944) seems to be due to the difference in species of the animals used.
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