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.