Position of onset of fast phase in optokinetic nystagmus.
D000818:Animals; D003445:Crustacea; D004594:Electrophysiology; D005133:Eye Movements / Q000502:physiology*; D009759:Nystagmus, Pathologic; D009801:Oculomotor Muscles / Q000502:physiology; D011984:Sensory Receptor Cells