论文信息 - Gravity perception in cerebellar patients.

Gravity perception in cerebellar patients.

Patients with midline cerebellar atrophy typically suffer from impaired postural balance. We asked whether this deficit is, in part, caused by a deficient perception of body position relative to gravity, and therefore measured the subjective visual vertical (SVV) in patients with degeneration predominantly of the midline cerebellar structures (n=11) and age-matched healthy human subjects (n=9). On a motorized turntable, subjects were placed in different roll positions [0, 75 degrees right ear down (RED), 75 degrees left ear down (LED)] and had to align a luminous arrow with the perceived earth-vertical. Both SVV deviations and intra-individual SD of SVV adjustments were not significantly different between patients and age-matched controls. Our findings suggest that the perception of verticality in patients with cerebellar ataxia may only deteriorate in a more advanced stage of the disease. To which degree the deterioration of perceived vertical is caused by a collateral vestibular impairment, awaits further clarification.

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