A material that does not easily transmit energy, such as electric current or heat. Materials such as wood, plastic, and ceramics are insulators. Fiberglass is an example of a heat insulator. (Compare conductor.)
An electroencephalogram (EEG) is a noninvasive test that records electrical patterns in your brain. The test is used to help diagnose conditions such as seizures, epilepsy, head injuries, dizziness, headaches, brain tumors and sleeping problems.
1 The electroencephalogram (EEG) is a medical test used to measure the electrical activity of the brain. 2  A number of electrodes are applied to your scalp. 3  EEG can help diagnose a number of conditions including epilepsy, sleep disorders and brain tumours. 4  Rate this website. 5  Your comments. 6  Questions.  Your details.