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One group took part in online games aimed at improving skills linked to general intelligence, such as reasoning, problem-solving and planning. A second test group did exercises to boost short-term memory, attention and mathematical and visual-spatial skills-functions typically targeted by commercial brain-training programs. The conclusion: Those who did the brain-training exercises improved in the specific tasks that they practiced. However, their improvement was generally no greater than the gains made by the control group surfing the Internet. And none of the groups showed evidence of improvement in cognitive skills that weren't specifically used in their tasks. (11).
The outcome of this test shows how memory cannot be gained even when they have the resources to prove how the brain can only contain and uphold information learned to a certain extent. Because of this conclusion, the results from this test show that yes, intelligence and memory can be strengthened and gained however there is a set limit on what the mind can truly remember. Likewise, The Human Memory explains short and long term memory telling, .
The short-term memory has a limited capacity, which can be readily illustrated by the simple expedient of trying to remember a list of random items (without allowing repetition or reinforcement) and seeing when errors begin to creep in. The often-cited experiments by George Miller in 1956 suggest that the number of objects an average human can hold in working memory (known as memory span) is between 5 and 9 (7 ± 2, which Miller described as the "magical number", and which is sometimes referred to as Miller's Law).
Millers law states how observation of an individual normally can retain or process items of information in their correct serial order in his or her short term or working memory. Tests have shown how the brain can only hold so much at a time, whether it's at its limited capacity over time or not.