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Improve fluid intelligence and crystallized intelligence
Over the ages scientists have explained the level of intelligence based on different criteria. Some of them explained it according to the level of education, while some others relate it to the job position that been achieved. Other scientists went with the measurement of wealth or the ability to create relationship with different people. However, despite the intelligence measurement method, is it possible to improve the level of the intelligence??

Fortunately, it is possible to improve the intelligence level for different people, which already had been proved by many studies and surveys. Below are two studies in which it had been proved that there is an ability to improve the "Fluid Intelligence" "crystallized Intelligence.

According to Jaeggi et al, 2008. In his study, “Improving fluid intelligence with training on working memory “. The fluid intelligence (GF) has closely linked with success in science and learning. As it is one of the most learning factors; though, it is possible to improve the performance of the examinee if it is been repeated several times. Results of this study confirmed that all four groups had improved their working memories, which indirectly improved fluid in intelligence. Moreover, the study showed an improvement in the trained groups' results of GF test. Specifically, all the groups who have achieved the average level in the beginning, they have been got increase of the performance by repeating the test. Also, the study mentioned that the level of performance improvement depends on the participants varying abilities. It can conclude with that the fluid intelligence is improved indirectly by improving working memory. In addition, the test resulted to in improvement in the observers working memory, too, due to their attention during the test observation.

According to Stankov, Lazar, (1988) ; this concerned the aging, attention, and intelligence of the people. The experiment had been conducted on a group of 100 people with age’s variation between 20 and 70 years. One of the experiment results that had been observed was that the attention of the people is considered as a branched part of the intelligence. In addition, the study shows that the changes in fluid intelligence and crystallized intelligence, which are associated with age growth, are dependent of variation of the people's attention, which explains the individual differences between people. Moreover, it was proved that there is no decline in the attention with age. Finally, the study indicates that there are three main factors that help to increase the attention, that are namely research, focus and focus at the primary stage which positively affect to increase the crystallized intelligence. It is worth mentioning that search is the more effective factor to improve the crystallized intelligence. In summary, the aging is not the cause of the attention drop; also, there are three factors affect the attention improvement, which are search, focus and focus at primary stage.