SPINAL COMPENSATION FOR POSTURAL DEFICITS AFTER HEMILABYRINTHECTOMY

REMOVAL of the labyrinthine organs on one side results in static and d ynamic disturbances. Some functional recovery occurs over time and is paralleled in frogs by an increase in the efficacy of central vestibul ar pathways. Here, we report concomitant increases in dorsal root evok ed ventral root responses in the brachial spinal cord and compare the time courses of neural changes in the brain stem and in the spinal cor d with the progress of postural recovery in frogs. From this compariso n we conclude that postural deficits are compensated by a spinal subst itution process on the operated side.