Quantitative analysis of pursuit eye movements by unidirectional target motion
The effects of a change in target speed (10°–100°/s) and amplitude (10°–80°) on smooth pursuit eye movements were analyzed in normal subjects by moving a target unidirectionally. The limit of pursuit speed adaptation changed according to changes in the target amplitude, being about 40°–50°/s at a target amplitude of 40°–80°. The minimum target amplitude needed to induce rhythmic pursuit eye movements markedly increased from 3.7° at 10°/s to 55.0° at 100°/s. The relationship between the gain (the ratio of eye speed to target speed) and the pursuit time suggested that pursuit eye speeds may depend on the pursuit time rather than absolute target speeds and that the gain might become unity even at fast target speeds, provided the critical pursuit time is given.
Key wordsEye-tracking test Smooth pursuit Gain Unidirectional target motion
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- 1.Baloh RW, Kumley WE, Sills AW, Honrubia V, Konrad HR (1976) Quantitative measurement of smooth pursuit eye movements. Ann Otol Rhinol Laryngol 85: 111–119Google Scholar
- 2.Benitez JT (1970) Eye-tracking and optokinetic tests: diagnostic significance in peripheral and central vestibular disorders. Laryngoscope 80: 834–848Google Scholar
- 3.Cohen B, Matsuo V, Raphan T (1977) Quantitative analysis of the velocity characteristics of optokinetic nystagmus and optokinetic after-nystagmus. J Physiol 270: 321–344Google Scholar
- 4.Corvera J, Torres-Courtney G, Lopez-Rios G (1972) The neurotological significance of alterations of pursuit eye movements and the pendular eye tracking test. Ann Otol Rhinol Laryngol 82: 855–867Google Scholar
- 5.Rashbass C (1961) The relationship between saccadic and smooth tracking eye movements. J Physiol 159: 326–338Google Scholar
- 6.Robinson DA (1965) The mechanics of human smooth pursuit eye movement. J Physiol 180: 569–591Google Scholar
- 7.Schalén L (1980) Quantification of tracking eye movements in normal subjects. Acta Otolaryngol (Stockh) 90: 404–413Google Scholar
- 8.Schalén L, Henriksson NG, Pyykko I (1982) Quantification of tracking eye movements in patients with neurological disorders. Acta Otolaryngol (Stockh) 93: 387–395Google Scholar
- 9.Takahashi M, Uemura T, Fujishiro T (1980) Studies of the vestibulo-ocular reflex and visual-vestibular interactions during active head movements. Acta Otolaryngol (Stockh) 90: 115–124Google Scholar
- 10.Troost BT, Daroff RB, Weber RB, Dell'Osso LF (1972) Hemispheric control of eye movements. Arch Neurol 27: 449–452Google Scholar
- 11.Umeda E (1980) The eye-tracking test. Ann Otol Rhinol Laryngol [Suppl 71] 89: 1–12Google Scholar