Drift in ocular counterrolling during static head tilt.
A decreasing drift of the counter-rolled eye position (OCR) during head tilt was recently described. The underlying mechanism is not known. OCR in eleven healthy subjects was recorded (Search coil, Skalar) during a head tilt paradigm in two test conditions. The head was tilted with a velocity below (test 1) and above (test 2) detection threshold for the semicircular canals (SC) and held static for eight minutes. A significant drift of OCR was revealed in test 2 (P = .0006, ANOVA) and close to significant in test 1 (P = .07). No statistical difference was found between the two test conditions. The results suggest that the OCR drift was not caused by the SC complex merely.
Pansell
Tony
T
Karolinska Institutet, Stockholm, Sweden. tony.pansell@ste.ki.se
Tribukait
Arne
A
Bolzani
Roberto
R
Schworm
Hermann D
HD
Ygge
Jan
J
D000222:Adaptation, Physiological; D000328:Adult; D005133:Eye Movements / Q000502:physiology*; D018475:Head-Down Tilt / Q000502:physiology*; D006801:Humans; D012016:Reference Values; D012665:Semicircular Canals / Q000502:physiology; D014102:Torsion Abnormality; D015348:Vision, Binocular