Evoked Potentials (EPs)

Evoked potentials measure the electrical activity in certain areas of the brain and spinal cord. The most common test is the Visual Evoked Potentials (VEP) test, measures how long it takes the brain to respond to messages sent by the eyes. The patient’s electrical response is measured with three electrodes, placed:

  1. Over the primary visual cortex
  2. Slightly above the projecting part of the occipital bone at the base of the skull (opinion)
  3. On the forehead or the top of the head

During the test, a Neurophysiologist observes patients as they sleep and move between light (non-REM) and deep (REM) sleep phases. The sleep pattern data is recorded, allowing us to identify any sleep disorders that are present. These could include chronic insomnia, narcolepsy, REM sleep behaviour disorder, restless legs syndrome, sleep apnea, or sleep-related seizure disorders.

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