An Inexpensive Eye Movement Monitor Using the Scleral Search Coil Technique

1. Eye position in Sepia was measured in restrained animals, using a scleral search coil technique. 2. Optokinetic nystagmus was elicited by drum rotations from 0.035 up to 35°/sec. 3. Passive rotation of Sepia in darkness evoked a transient nystagmus, followed by after-nystagmus at arrest. 4. Combination of these two stimuli yielded the best results, but the ratio eye velocity/surroundings velocity was usually not better than 0.5. 5. Eye movements were conjugate and a closed eye could be driven by a seeing eye. Monocular reactions were smaller than binocular ones, but equal in both directions. 6. Fixation movements could not be demonstrated in the present conditions.

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A quantitative study of abnormal eye movements in Huntington's chorea using the scleral search coil technique

Neuro-Ophthalmology ◽

10.3109/01658108409019493 ◽

1984 ◽

Vol 4 (1) ◽

pp. 27-38 ◽

Cited By ~ 1

Author(s):

Trevor H. Kirkham ◽

Daniel Guitton

Keyword(s):

Eye Movements ◽

Quantitative Study ◽

Huntington's Chorea ◽

Search Coil ◽

Search Coil Technique

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99. Long-term eye movement recordings with a scleral search coil-eyelid protection device

Clinical Neurophysiology ◽

10.1016/j.clinph.2008.07.098 ◽

2009 ◽

Vol 120 (1) ◽

pp. e42-e43

Author(s):

A. Sprenger ◽

B. Neppert ◽

S. Köster ◽

S. Gais ◽

D. Kömpf ◽

...

Keyword(s):

Eye Movement ◽

Protection Device ◽

Search Coil

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Auditory localization in the northern saw-whet owl, Aegolius acadicus

Canadian Journal of Zoology ◽

10.1139/z89-279 ◽

1989 ◽

Vol 67 (8) ◽

pp. 1955-1959 ◽

Cited By ~ 8

Author(s):

B. J. Frost ◽

P. J. Baldwin ◽

M. Csizy

Keyword(s):

Great Accuracy ◽

Auditory Localization ◽

Head Orientation ◽

Sound Sources ◽

Slight Tendency ◽

Search Coil ◽

Aegolius Acadicus ◽

Localization Ability ◽

Search Coil Technique ◽

Vertical Localization

Although there are several anecdotal reports in the literature that northern saw-whet owls (Aegolius acadicus) have extremely accurate auditory localization abilities, there have been no attempts to quantify these observations. In this study we used the search coil technique to obtain precise measurements of the northern saw-whet owl's head orientation toward either cricket chirps or mouse squeaks presented through speakers at various azimuthal positions. The results indicate owls of this species can orient their heads toward sound sources with great accuracy in the azimuthal plane, yielding mean errors of <1.0°, but show a slight tendency to undershoot more peripherally located sounds. Vertical localization is somewhat less precise, but still very accurate. Subsequent studies will be aimed at elucidating the physiological and anatomical substrates of this extreme accuracy in auditory localization ability.

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