Psychology is known as the science of behavior and mental process. In Greek psychology has been define as a study that will talk about the soul where, the psyche and logos is both an academic and applied discipline that involving the scientific study of mental process and behavior. In other terms, psychologies also know as a study of the thought processes and behavior of humans and other animals in their interaction with the environment. Psychologists study processes such as perception, cognition, emotion and motivations, personality, abnormal behavior, and interpersonal relationships. Its also refers to the application of knowledge to various spheres of human activity, including issues related to daily life, such as family, education, work, and the treatment of mental health problem.
Memory of human was a part of the psychology study, Memory refers to the process that are used acquire, store, retain, and letter retrieve information. There are three major process involve in memory; encoding, storage and retrieval. In order to form new memories, information must be changed to usable form, which occurs through the process know as encoding. Once information has been successfully encoded, it must be stored in memory for later use. Much of this stored memory lies outside of our awareness most of the time, except when we actually need to use it. The retrieval process allows us to bring stored memories into conscious awareness. The interest of psychologists in how human memory works and how human brains can be improve have give the psychologists an inspirations to develop theories of memory using the computer as a model. These information processing theories of memory are just based on similarity of human brain operation and the computer. According to the stage theory of memory based on Atkinson & Shiffrin.1968; Baddeley, 1999, assume that humans have a three-stage memory that meets our need to store information for different lengths of time. The three