Assessing alpha activity in attention and relaxed state: An EEG analysis

An electroencephalogram is a recording of brains spontaneous electrical activity. This is controlled by billions of neurons. These neurons continually send messages to each other which can be picked up as electrical impulses from the scalp. The process of picking up and recording the impulses is known as EEG. An EEG can be divided into four basic frequency bands namely delta, theta, alpha and beta. This paper shows changes in the power of alpha frequency band on performing attention tasks. It is observed that mean alpha power decreased while performing attention task as compared to mean alpha power in relaxed state in the frontal and occipital region of the brain. No statistically significant changes in alpha power are found in prefrontal region of the brain during attention tasks.