What is stimulus generation in electronystagmography (ENG)?

Updated: Aug 06, 2019
  • Author: Angela G Shoup, PhD; Chief Editor: Arlen D Meyers, MD, MBA  more...
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Oculomotor stimulus generation was initially accomplished with manually controlled objects. Gaze and saccadic testing used dots placed on the wall and/or ceiling at specified places (eg, 10 degrees, 20 degrees, and 30 degrees in each direction), optokinetic testing was conducted with a rotating drum with stripes of contrasting colors, and smooth pursuit testing was conducted with a swinging pendulum or metronome.

Although these systems could provide gross evaluation of the various oculomotor subsystems, fine analysis of latency and accuracy of eye movements in response to the stimulus was not possible. Systems with computer-generated stimuli locked to the acquisition of the responses allow for more sophisticated analysis (eg, latency, amplitude). Computerized systems may use light-emitting diodes on a light bar anchored to the wall or in a self-contained oculomotor stimulator or computer-generated stimuli projected on a screen or video monitor.

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