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  • Visual evoked potential recorders designed for detecting, amplifying and recording the transient change of the electrical potential on or near the surface of an animal\'s cornea following stimulation of the retina by external repetitive stimuli. The results may be displayed as a graphic of the measured voltages vs. time (an electroretinogram); the graph usually shows the a-wave is the first large negative component, followed by the b-wave which is corneal positive and usually larger in amplitude. These recorders typically consist of detachable electrodes; signal amplifiers; filters (to suppress interference); memory (e.g., electronic, optical/magnetic disc); and a display. The recorder may include capabilities to deliver external stimuli (e.g., reversible checkerboard patterns, flashlights) at an appropriate repetitive level to elicit the bioelectric response needed for recording.
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