electrooculogram


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Related to electrooculogram: Electrooculography

e·lec·tro·oc·u·lo·gram

(ē-lek'trō-ok'yū-lō-gram),
A record of electric currents in electro-oculography.

e·lec·tro·oc·u·lo·gram

(ĕ-lek'trō-ok'yū-lō-gram)
A record of electric currents in electrooculography.

electrooculogram (EOG)

Recording of eye movements and eye position provided by the difference in electrical potential between two electrodes placed on the skin on either side of the eye. The EOG consists of two potentials: the standing potential (resting potential, dark phase, dark current) which is evoked by moving the eyes in the dark and originates from the retinal pigment epithelium and the light potential (light rise) which is evoked by moving the eyes in a lighted environment and originates from the photoreceptors. Clinically, the ratio between the light and dark potentials (sometimes also called the Arden index or Arden ratio) is assessed. If that ratio is less than 1.8 it indicates a malfunction of the structures from which the potential originates. The EOG is also used to monitor eye movements (Fig. E3). See Best's disease; fundus flavimaculatus; resting potential of the eye.
Fig. E3 Principle of electrooculography. The eye acts as a dipole in which the anterior pole is positive and the posterior pole is negative. 1. Left gaze; the cornea approaches the electrode near the outer canthus resulting in a positive-going change in the potential difference recorded from it. 2. Right gaze; the cornea approaches the electrode near the inner canthus resulting in a positive-going change in the potential difference recorded from it (A, an AC/DC amplifier)enlarge picture
Fig. E3 Principle of electrooculography. The eye acts as a dipole in which the anterior pole is positive and the posterior pole is negative.1.Left gaze; the cornea approaches the electrode near the outer canthus resulting in a positive-going change in the potential difference recorded from it. 2.Right gaze; the cornea approaches the electrode near the inner canthus resulting in a positive-going change in the potential difference recorded from it (A, an AC/DC amplifier)
References in periodicals archive ?
Babiloni, "On the Use of Electrooculogram for Efficient Human Computer Interfaces," Computational Intelligence and Neuroscience, vol.
[8] Additional channels (C3-A2, Fpz-A2, and O1-A2) were recommended to provide redundancy in case of electrode malfunction [9] Electrooculogram (EOG) derivations were E1 - Fpz and E2 - Fpz.
Bilateral eyes had normal function of electrooculogram (EOG), while flash electroretinogram (FERG) suggested a decrease of b wave in bright adaption.
All patients underwent a single-night full diagnostic PSG study (Alice 5, Diagnostics System, Respironics, USA) according to standard techniques, with monitoring of the electroencephalogram (EEG), electrooculogram (EOG), electromyogram (EMG), flow (by oronasal thermistor and nasal air pressure transducer), thoracic and abdominal respiratory effort (by respiratory induction plethysmography), oximetry, and body position.
The polysomnography recordings were conducted by Embla N7000 Recording System (Embla Systems Inc., Colorado, USA) and included four EEG leads (C3-M2, C4M1, O1-M2, and O2-M1), two electrooculogram leads, chin electromyogram, single-channel of electrocardiogram (ECG, sampling rate 200 Hz), respiratory inductance pattern from thoracic and abdominal plethysmography, nasal flow, snoring sound, and pulse oximetry placed at the index finger of the left hand (sampling rate 100 Hz).
Early on, there is characteristic attenuation of the b wave on electroretinogram with a normal electrooculogram. Later, there is widespread photoreceptor degeneration with bone spicules, vascular attenuation, salt and pepper macula, bull's eye lesion and optic atrophy.
[4.] Kim Y, Doh NL, Youm Y, Chung WK (2007) Robust discrimination method of the electrooculogram signals for human-computer interaction controlling mobile robot.
Four- channel electroencephalogram (EEG), electromyogram (EMG-submental and right-left tibialis), two-channel electrooculogram (EOG - right-left), electrocardiogram (ECG), nasal airflow, thorax and abdominal respiratory movements, pulse oximetry, blood oxygen saturation and body position data were recorded throughout the night during PSG.
While each participant watched 40 music video excerpts of one-minute duration each, 32-dimensional EEG signals using 10-20 international system [30] and various peripheral physiological signals--Galvanic skin response (GSR) [24], respiration amplitude, skin temperature, electrocardiogram (ECG) [37], blood volume by plethysmograph, electromyograms of Zygomaticus and Trapezius muscles (EMG) [37], and electrooculogram (EOG) [17], skin temperature and respiration--were collected.
Another electrode was placed above the right eye to record the electrooculogram. Signals were amplified, filtered (0.5-80 Hz), and stored in a biopotential analyzer (Micromed System Plus, Italy).
The evaluation of the electrooculogram as a psychophysiological measuring instrument in the driver study of driver behaviour.
The electrooculogram (EOG) was recorded with two electrodes located in a horizontal (right) and vertical (left) direction to record eye movement.