![]() If we were to record your EEG right now as you are reading this material we should detect beta waves. Based on the frequency and amplitude of the tracings, four EEG patterns can be discerned. Indeed, a flat EEG is a sign of clinical death. Although there is no regular, repeating pattern like might be seen in an electrocardiogram, the information from the EEG can be very useful in evaluating conditions in the brain. An electroencephalogram (EEG) is the tracing recorded by this instrument. These differences in charge on the outside of the neurons create electrical fields that can be detected my sensitive electrodes strategically placed on the skin of the scalp and recorded on an instrument known as an electroencephalograph. The other neuron is at rest and the outside is positive while the inside is negative. Imagine two neurons in close proximity, one has depolarized such that on the outside of the membrane there is a negative charge and on the inside of the membrane and a positive charge. ![]() The neurons of the brain are constantly generating these electrical signals. We have described these changes in earlier modules and given them the names of action potentials and local potentials. Higher Brain Functions: The EEG and SleepĪ characteristic of all excitable tissues (nervous and muscle tissue) is that they are capable of generating and propagating signals that involve changes in the electrical charge on the cell membrane. ![]()
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