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Gravity perception in cerebellar patients.

A A Tarnutzer¹, S Marti, D Straumann

¹Department of Neurology, Zurich University Hospital, Zurich, Switzerland. alexander.tarnutzer@access.unizh.ch

Progress in Brain Research

|August 23, 2008

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Patients with midline cerebellar atrophy showed no significant difference in subjective visual vertical perception compared to healthy controls. This suggests postural balance deficits may not stem from early-stage visual vertical perception issues.

Area of Science:

Neuroscience
Human Physiology

Background:

Midline cerebellar atrophy often leads to impaired postural balance.
The role of gravity perception in this balance deficit is not fully understood.

Purpose of the Study:

To investigate if midline cerebellar atrophy affects the perception of verticality relative to gravity.
To measure the subjective visual vertical (SVV) in patients with cerebellar degeneration.

Main Methods:

Compared SVV in 11 patients with midline cerebellar atrophy and 9 age-matched controls.
Subjects adjusted a luminous arrow to perceived earth-vertical on a motorized turntable at various roll positions (0, 75° RED, 75° LED).

Main Results:

No significant differences were found in SVV deviations between patients and controls.

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Intra-individual standard deviation of SVV adjustments also showed no significant difference.

Conclusions:

Perception of verticality may remain intact in early stages of cerebellar ataxia.
Further research is needed to clarify the impact of vestibular impairment on perceived verticality in these patients.