Human beings are proficient to do more than two things in same time. This can be known from the simple example such as we can walk by reading newspaper, watch television and talk in phone. These works can be done without any difficulties. But everyone cannot develop the ability to do works simultaneously as the other does. For example consider a man can play drums and trumpet but not on the same time. But there are some people who can make these things possible.

To achieve this level it needs continuous practice and determination. The level of skills always varies from person to person in all manners from conscious in competence t unconscious competence.The skills we have experienced for a long time will be internalized and can be performed right into old age.  Even if there is a stage of non practice, it will habitually take just a few minutes before the brain and the body “remembers” the skill. 

Just like any skill that we have learned the mastering of recollection training or recall techniques follow the same rule of proficiency.  It is no speculating that top practitioner of astounding memory feat practice their craft everyday.  Able to keep in mind long digits of numbers of hundreds or even thousands of digits long and to memories similar long list of dissimilar words.  The old tried and tested method of mastering any skill is put into practice.