electro-, electr-, electri-

A device that produces electric charges from the friction between a disk and a metal plate.

A colorimeter that uses a phototube or photocell, a set of color filters, an amplifier, and an indicating meter for quantitative determination of color.

Phototherapy (light treatment) in which the source of the rays is the electric light.

1. The branch of medicine or biology dealing with the study of electric activity in human or animal bodies.
2. The branch of physiology that studies the relationship between electric phenomena and bodily processes.
3. The electric activity associated with a bodily part or function.

The immediate effects produced by the passage of an electric current through any part of the body; such as, painful stimulation of nerves or tetanic contractions of muscles.

Tetanic contractions refers to the fusion of a number of simple spasms into an apparently smooth, continuous effort.

An electronic device manufactured by the Church of Scientology at their Gold Base production facility.

Known as an "E-meter", it measures changes in the electrical resistance of the human body by inducing a tiny electrical current through it.

The face of the electropsychometer has a galvanometer that indicates changes in the subject's resistance. According to Scientology doctrine, the resistance corresponds to the "mental mass and energy" of the subject's mind, which changes when the subject thinks of particular mental images or engrams (unconscious, painful memories).

These concepts have no recognition among scientists outside of Scientology; the action of the E-meter is more commonly attributed to galvanic skin response, an effect used in lie detectors.

Abbreviated ERG; a test in which the electrical potentials generated by the retina of the eye are measured when the retina is stimulated by light.

The instrument used to do electroretinography is known as an electroretinograph and the resultant recording is called an electroretinogram.

In an ERG, an electrode is placed on the cornea at the front of the eye. The electrode measures the electrical response of the rods and cones, the visual cells in the retina at the back of the eye. An ERG may be useful in the evaluation of hereditary and acquired disorders of the retina.

A normal ERG shows the appropriate responses with increased light intensity. An abnormal ERG is found in conditions; such as, arteriosclerosis of the retina, detachment of the retina, and temporal arteritis with eye involvement.

A graphic record or curve showing the action potential of the salivary glands, obtained with an electrically operated instrument.