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Abstract
Sixteen spinalized adult cats were stimulated through galvanic polarization monaurally. Depolarization produced a horizontal ipsilateral nystagmus, and hyperpolarization a horizontal contralateral nystagmus in the intact animals. Thereafter the contralateral labyrinth was destroyed, and the remaining intact labyrinth was stimulated. Depolarization increased the destruction nystagmus, and hyperpolarization decreased the nystagmus to zero, but it was impossible to reverse its direction. It was concluded that it is not possible to cause a nystagmus in both directions from only one semicircular canal.