EEG and Epilepsy Essay Example | Topics and Well Written Essays - 1500 words

EEG and Epilepsy - Essay Example In the brain, there is a three-dimensional volumes of cortex from which the electroencephalographic (EEG) signal is generated. Each dimension of the cortex produces unique signal and hence three different potential signals are are produced within the brain. Two of the signals are recorded from the surface of the scalp where they are recorded as two-dimensional fields against the voltage. This technique is accomplished by determining the physical and functional components of the EEG cortical generators. After determining the nature and the location of the EEG fields, the signal of the pd is characterized and graded according to inhibitory postsynaptic potentials (IPSPs) and excitatory postsynaptic potentials (EPSPs) According to the various tests that have been conducted on EEG fields, Epileptic spikes are negatively charged in nature. This is mainly caused by the depolarization of the superficial laminae. After the depolarization cycle, the subsequent repolarization cycle brings about the recurrent excitation and inhibition among laminae. This causes a sequence of negative spikes that normally translate to a negative wave detected by the electrodes. The Committee of the International Federation (CIF) of the body governing Electroencephalography and Clinical Neurophysiology (IFSECN) have made the recommendations that the placement of a specific system of electrode under standard conditions for use in all medical laboratories. The system, branded as the international 10-20 system, gives specific measurement parameters from bony landmarks and hence used to determine the nature of electrodes. Anatomical landmarks are useful in this technique as they give specific measurements made, and then approximately10% to 20% of a specified distance is useful in the electrode interval. The specific measurement enables the consistently in replication over time and between laboratories and hence the system is very reliable. However, a lot of vigilance