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Role of Cerebellar Nodulus and Uvula on the Vestibular Quick Phase Spatial Constancy.

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Title: Role of Cerebellar Nodulus and Uvula on the Vestibular Quick Phase Spatial Constancy.
Authors: Pettorossi, V. E., Grassi, S., Errico, P., Barmack, N. H.
Source: Acta Oto-Laryngologica (Supplement). Sep2001 Supplement 545, Vol. 121, p155-159. 5p. 3 Graphs.
Subjects: Vestibular apparatus, Cerebellum, Uvula
Abstract: We investigated the orientation of quick phases (QPs) of vestibularly-induced eye movements in rabbits in response to ''off-vertical'' sinusoidal vestibular stimulation. We also examined the possible role of the cerebellar nodulus and ventral uvula in controlling QP spatial orientation and modification. During ''off-vertical'' vestibular stimulation QPs remained aligned with the earth's horizontal plane, while the slow phases (SPs) were aligned with the plane of vestibular stimulation. This suggests that QPs are coded in gravito-inertial coordinates and SPs in head coordinates. When rabbits were oscillated in the light (20° peak-to-peak; 0.2 Hz) about an ''off-vertical'' axis for 2 h, the QPs changed their trajectory, abandoning the earth's horizontal plane to approach the plane of the stimulus. By contrast, in the absence of conjunctive optokinetic stimulation, QPs remained fixed in the earth's horizontal plane even after 2 h of ''off-vertical'' stimulation. The conjunctive combination of optokinetic and vestibular stimulation caused QPs to change their plane of rotation. After lesion of the nodulus-uvula the ability of rabbits to reorient QPs during conjoint vestibular-optokinetic stimulation was maintained. We conclude that the space orientation and adaptation of QPs do not require cerebellar control. [ABSTRACT FROM AUTHOR]
Copyright of Acta Oto-Laryngologica (Supplement) is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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  Data: Role of Cerebellar Nodulus and Uvula on the Vestibular Quick Phase Spatial Constancy.
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  Data: <searchLink fieldCode="JN" term="%22Acta+Oto-Laryngologica+%28Supplement%29%22">Acta Oto-Laryngologica (Supplement)</searchLink>. Sep2001 Supplement 545, Vol. 121, p155-159. 5p. 3 Graphs.
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  Data: <searchLink fieldCode="DE" term="%22Vestibular+apparatus%22">Vestibular apparatus</searchLink><br /><searchLink fieldCode="DE" term="%22Cerebellum%22">Cerebellum</searchLink><br /><searchLink fieldCode="DE" term="%22Uvula%22">Uvula</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: We investigated the orientation of quick phases (QPs) of vestibularly-induced eye movements in rabbits in response to ''off-vertical'' sinusoidal vestibular stimulation. We also examined the possible role of the cerebellar nodulus and ventral uvula in controlling QP spatial orientation and modification. During ''off-vertical'' vestibular stimulation QPs remained aligned with the earth's horizontal plane, while the slow phases (SPs) were aligned with the plane of vestibular stimulation. This suggests that QPs are coded in gravito-inertial coordinates and SPs in head coordinates. When rabbits were oscillated in the light (20° peak-to-peak; 0.2 Hz) about an ''off-vertical'' axis for 2 h, the QPs changed their trajectory, abandoning the earth's horizontal plane to approach the plane of the stimulus. By contrast, in the absence of conjunctive optokinetic stimulation, QPs remained fixed in the earth's horizontal plane even after 2 h of ''off-vertical'' stimulation. The conjunctive combination of optokinetic and vestibular stimulation caused QPs to change their plane of rotation. After lesion of the nodulus-uvula the ability of rabbits to reorient QPs during conjoint vestibular-optokinetic stimulation was maintained. We conclude that the space orientation and adaptation of QPs do not require cerebellar control. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Acta Oto-Laryngologica (Supplement) is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1080/000164801750388342
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      – Code: eng
        Text: English
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        PageCount: 5
        StartPage: 155
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      – SubjectFull: Vestibular apparatus
        Type: general
      – SubjectFull: Cerebellum
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      – SubjectFull: Uvula
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              M: 09
              Text: Sep2001 Supplement 545
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              Y: 2001
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