Biomaterial Database

Vertical optokinetic nystagmus in normal individuals. 1996

S Ogino, and I Kato, and A Sakuma, and K Takahashi, and I Takeyama

Department of Otolaryngology, St. Marianna University School of Medicine, Kanagawa, Japan.

In this study, 20 subjects (5 women and 15 men, 22-28 years old) were tested for vertical optokinetic nystagmus (OKN) to establish the asymmetry between up and down OKN responses in humans. The subjects were exposed to both upward and downward OKN stimulus at constant velocities of 30, 40, 50, 60, 70, 80, 90 degrees/s in the upright position. Eye movements were recorded precisely using the magnetic search coil system in order to eliminate any methodological problem associated with the eye-lid artifact. Slow phase velocity during upward OKN stimulus was higher than that during downward OKN stimulus for each OKN velocity. It is likely that otolithic stimuli cause up and down asymmetry. Statistical significance in the gain between upward and downward OKN was noted for stimulus velocities of 30-60 degrees/s (p < 0.01), but not for higher velocities, because vertical OKN saturated around 40-50 degrees/s.

UI	MeSH Term	Description	Entries
D008297	Male		Males
D011897	Random Allocation	A process involving chance used in therapeutic trials or other research endeavor for allocating experimental subjects, human or animal, between treatment and control groups, or among treatment groups. It may also apply to experiments on inanimate objects.	Randomization,Allocation, Random
D005260	Female		Females
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000328	Adult	A person having attained full growth or maturity. Adults are of 19 through 44 years of age. For a person between 19 and 24 years of age, YOUNG ADULT is available.	Adults
D014716	Vertical Dimension	The length of the face determined by the distance of separation of jaws. Occlusal vertical dimension (OVD or VDO) or contact vertical dimension is the lower face height with the teeth in centric occlusion. Rest vertical dimension (VDR) is the lower face height measured from a chin point to a point just below the nose, with the mandible in rest position. (From Jablonski, Dictionary of Dentistry, 1992, p250)	Mandibular Rest Position,Rest Vertical Dimension,Vertical Dimension at Rest,Vertical Dimension of Occlusion,Dimension, Rest Vertical,Dimension, Vertical,Dimensions, Rest Vertical,Dimensions, Vertical,Mandibular Rest Positions,Occlusion Vertical Dimension,Occlusion Vertical Dimensions,Position, Mandibular Rest,Positions, Mandibular Rest,Rest Position, Mandibular,Rest Positions, Mandibular,Rest Vertical Dimensions,Vertical Dimension, Rest,Vertical Dimensions,Vertical Dimensions, Rest
D017120	Nystagmus, Optokinetic	Normal nystagmus produced by looking at objects moving across the field of vision.	Optokinetic Nystagmus