Organization the memory processes in the brain based on fractal analysis

Learning and memory processes are two important cognitive functions that have no meaning without the other. The learning and memory mechanisms are faced with many challenges due to the complexity of many challenges, one of the powerful tools of self - organizing mental analysis during learning, EEG. The purpose of this study is to investigate the dynamics of learning and memory processes (coding, maintenance and retrieval) in the brain.
 Eighteen voluntary healthy subjects age range 18 – 23 assigned for evaluate auditory verbal learning test (AVLT). All of them are university students and right handed. EEG signals are recorded during five stages of AVLT and so before and after behavioral test. Simultaneous to estimate learning rate and memory process through behavioral assessment, the dynamics of these changes are investigated by Higuchi fractal dimension estimation EEG signals.
The results of this study showed that increasing the number of words recalled or increasing the learning rate of participants is inversely proportional to the highchi fractal dimensionality 
of the EEG signals. Power spectrum obtained show an increase in overall frequency spectrum of the EEG.
Approximation entropy confirm to reduce the chaotic behavior of signals due to decreasing the complexity   of signals in during memory process increases.
The fractal and oscillatory components behavior of the EEG signals present brain organization during learning and memory processes.