Besides, both forming and operation of STM are connected with momentum. We keep in STM some piece of information, some reaction, emotion, etc., which we have learnt or experiences recently, right at the moment. That is why in many situations information in STM is clearer and more detailed, than the one we can recall from LTM, which was recorded and stored long ago.

But, of course, STM and LTM are closely related between each other; because both of them (operating together) form our memory and allow us enjoy all its advantages. First of all, all the received information, which is kept in STM and used by our working memory for some urgent needs, sooner or later is transferred to LTM and gets stored there in order to be recalled in the future when necessary.

Besides, in many cases we find the information to keep in our mind for some urgent use (STM) in our old memories (LTM). In other words, sometimes necessary information for STM is recalled from our LTM. For example, a person can restore some vocabulary and knowledge of foreign language, which were obtained much earlier, and start practicing the language again, if required.

It is a known fact that there are long term memory (LTM) and short term memory (STM). Short term memory (sometimes is also called primary, acting or working memory) is a complex system, which serves for short-term storage and fast recalling of the information. In other words, STM helps to save some limited amount of information for some short time (usually, from 30-40 seconds up to a few minutes).

Long term memory helps to keep and store information for much longer time, even for all of our life. Our LTM stores the information, which we received years ago, and helps to recall it when it is required. If by some reasons our LTM can not reach necessary information, it is supposed to be lost and can be only re-obtained. Biologically, LTM is connected with some transformations in the structure of neurons in our brain.

At the first time the category of LTM was introduced by psychologist William James in his work Principles of Psychology, published in 1890. He discovered that human memory consists of two components: primary memory (STM) and secondary memory (LTM). Within the time, studying and analyzing the issues, connected with the properties of human memory, were among the most interesting and topical for biologists and medical scientists througout the world.