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The “10” and “20” refer to the fact that the actual distances between adjacent electrodes are either 10% or 20% of the total front–back or right–left distance of the skull. For example, a measurement is taken across the top of the head, from the nasion to inion.Click to see full answer. Considering this, what is the 10 20 electrode system in EEG recording?The 10-20 System of Electrode Placement is a method used to describe the location of scalp electrodes. These scalp electrodes are used to record the electroencephalogram (EEG) using a machine called an electroencephalograph. Each point on this figure to the left indicates a possible electrode position.Additionally, how many electrodes are used in EEG? In most clinical applications, 19 recording electrodes (plus ground and system reference) are used. A smaller number of electrodes are typically used when recording EEG from neonates. Similarly, how do you measure f3 and f4 EEG? Measure and mark 20% of the Nasion-Inion distance from FP1 to F3. At the intersection will be your true F3 mark. Measure and mark 20% of the Nasion-Inion distance from FP2 to F4. At the intersection will be your true F4 mark.What are the four basic EEG patterns?The amplitude of the EEG pattern is the strength of the pattern in terms of microvolts of electrical energy. There are four basic EEG frequency patterns as follows: Beta (14-30 Hz), Alpha (8-13 Hz), Theta (4-7 Hz), and Delta (1-3 Hz). In general, the amplitude of the EEG increases as the frequency decreases.

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