Electroencephalography, or EEG for short, is used to measure and display potential fluctuations of nerve cells in the cerebrum. The basis for this is the change in electrolyte concentration (electrolytes = salts) of the intra- and extracellular space during excitation of the cell. It is important that the EEG does not record individual action potentials, … Electroencephalography
Evaluation Depending on the problem, different parameters are taken into account when evaluating the electroencephalogram. To characterize the EEG waves, first their frequency is determined. During periods of high stress on the neurons of the cerebrum, such as when solving a difficult mental exercise, the EEG can register waves with a frequency of 30-80 Hz … Evaluation | Electroencephalography
Electroencephalography and sleep It was only with the help of electroencephalography that researchers succeeded in defining the sleep stages known today. Above all, the different wave frequencies and other peculiarities such as sleep spindles or k-complexes help to differentiate. First, a normal sleep cycle is described. If you close your eyes, alpha waves with low … Electroencephalography and sleep | Electroencephalography
Clinical use Some pathological changes of the brain can be visualized by means of the EEG. For example, circulatory, attention and sleep disorders can be diagnosed with this method. A special example is the neurodegenerative disease multiple sclerosis. In the course of the disease, the insulating layer around the nerve cells breaks down, limiting their … Clinical use | Electroencephalography
