People think or use their brain to support simple daily practical activities or complex future problems
they encounter in life. In performing these activities, people use and consider the information or
memories in the brain they have collected from the previous experience, the world around they sensed,
and what they read and learned. Therefore, human ability to absorb, retain and recall that information
becomes crucial for survival. Unfortunately, this does not always happen smoothly. In carrying out daily
activities, people often do a single task without complex cognitive processes like walking; sitting;
sleeping or bathing, and mostly, they would do it smoothly. However, when they have to perform a serial
task or even multi-task involving concentrating, thinking, remembering, writing, saying a word or