Linked Life Data

3971155

Source:http://linkedlifedata.com/resource/pubmed/id/3971155

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
1985-4-8
pubmed:abstractText
The contribution from different pairs of semicircular canals to the generation of horizontal vestibular nystagmus was examined in monkeys. Animals with different pairs of semicircular canals surgically plugged were accelerated sinusoidally at 1 Hz (a predictive stimulus) or with steps of angular velocity (a non-predictive stimulus) about an earth vertical axis while the head was placed in various static pitch positions. In normal animals, and in animals with only the lateral canals intact, horizontal nystagmus elicited with angular velocity steps is maximal at a static pitch angle of 15 degrees nose-down (relative to the horizontal stereotaxic plane). The response follows a cosine function of the pitch angle, approaches zero at an angle of 90 degrees to the optimal orientation, and finally reverses. In animals with only the vertical canals operating, direction specific horizontal nystagmus can still be elicited. Using velocity steps, a null plane at which nystagmus reverses can be determined. It is found at about 32 degrees nose-down and thus is different from the optimal plane of the lateral canals. Consequently, it is not possible to stimulate the lateral canals maximally without stimulating the vertical canals simultaneously. Using sinusoidal rotation, nystagmus is attenuated at the static pitch position of 32 degrees nose-down, but does not reverse direction with further pitching.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
0006-8993
pubmed:author
pubmed:issnType
Print
pubmed:day
11
pubmed:volume
326
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
291-8
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed:year
1985
pubmed:articleTitle
Vestibulo-ocular reflexes after selective plugging of the semicircular canals in the monkey--response plane determinations.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't