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Your brain waves were measured over a long period of time. A video recording was made of you at the same time.

The brain is located inside the head. It receives, processes and stores sensory impressions. The brain controls movements and various physical functions.

Many of the brain’s processes involve mild electrical currents flowing to the nerve cells. Some of these currents can then be measured in the brain. To do the measuring, sensors are introduced onto or into the brain. This is done via surgery under general anesthetic. Sensors like these may be metal plates that are placed on the surface of the brain. Metal wires may also be used, being pushed more deeply into the brain tissue. The various sensors enable different areas of the brain to be examined.

The brain waves are represented as lines or waves on a screen or on paper. When seizures occur, the lines or waves change. The measurements enable the seizure triggers to be assigned to an area in the brain. A video recording was made of you while the measurements were being taken. In this way, when certain changes occur in the brain waves, for example, it can show whether you have just had a seizure.

Testing like this is carried out over a long period of time. This may take several days.