The electrical activity is a superposition of the huge number of electrical charges arising from multiple sources likewise brain cells i.e. Moreover, EEG directly measures the brain’s electrical activity, whilst other methods such as SPECT, fMRI record changes in blood flow, or PET record changes in metabolic activity, which are indirect markers of electrical activity belonging to the brain. Whereas, other methods likewise fMRI and PET has time resolution in terms of seconds and minutes and makes these methods less efficient. Depending upon the type of neuron, an action potential takes 0.5–130 milliseconds approximately to propagate across a single neuron. As this communication passes current (electrical potential) using neurotransmitter, a chemical messenger, it can be considered as communication is a process that is electrical and chemical both.Īs shown in Figure 1, the neurons are activated using an electrochemical concentration gradient, local current flows are produced.ĮEG works as a good tool to explore brain activity and can detect changes within milliseconds. This chemical messenger (neurotransmitters) then activates receptors corresponding to it in the postsynaptic neuron, this action generates postsynaptic currents this process keeps going on for the next synapse. Since neurons are not connected physically, it uses a chemical messenger entitled neurotransmitters, which crosses the synaptic gap to carry-forward messages to the next neuron. These neurons communicate with each other by sending an electrical potential (charge) down the axon and across the synapse to the very next neuron. It controls one’s whole human body and consists of approximately 100 billion cells, known as a neuron, a part of the human nervous system. The human brain is so much sophisticated that it has given so many brilliant research works which seem superficial at first look likewise ultra-modern supercomputer, aircraft and one of the missile technologies LGM-30G Minuteman-III, etc. One of the most complex structures on this earth is the human brain with an estimated approximately weight of 3lbs.
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