The importance of the brain in our everyday lives can never be underestimated. The brain has physical properties that are in a constant state of flux. The brain never rests totally but is always teeming with electrochemical activity. All cognitive functions such as consciousness, attention, memory, thinking, the use of language and many more are reflection of the modulated pattern of chemical activity among specialised cells i.e. neuron , that are mostly concentrated in the brain's cerebral cortex. We owe our entire cognitive universe to the functioning of these neurons which transmits information in the form of electrical waves.