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Optokinetic after-nystagmus under prolonged alteration in the direction of gravity
M Igarashi1, Y Watanabe, M Ikeda
1University Research Center, Nihon University, Tokyo, Japan.
Acta Oto-Laryngologica
|March 1, 1995
Abstract:
Optokinetic nystagmus (OKN) and after-nystagmus (OKAN) show different responses depending on the direction of gravity with respect to the head and body. In 13 normal healthy persons (10 experimental and 3 control subjects), we studied the OKAN evoked by horizontal and vertical stimuli, in upright, side-lateral, and repeated upright positions along a time course of more than 6 h. The results showed continuous modifications of OKAN, the degree increasing with time. Lateral tilt produced different effects on the intrinsic vertical and horizontal optokinetic oculomotor systems.