Abstract
One of the most important investigation procedures in the clinical neurootological examination is the search for positional or positioning nystagmus. Positioning nystagmus in contrary to positional nystagmus in its various forms is commonly looked upon as being of peripheral origin whereas the latter usually is regarded to be of central origin. Animal experiments as well as clinical observations however revealed, that this classification does not hold true in every case. Both types of nystagmus can either occur in pure central or peripheral vestibular lesions. Furthermore it could clearly be shown that positional nystagmus always must be due to disturbed integration of semicircular canal and otolithic impulses. The occurence of positioning nystagmus however can not be explained on the basis of our knowledge about vestibular function at present.
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