I dont think storage space is a problem for the brain. People tend to forget if the dont use the information regularly which is why revising is helpful for exams.
Depends if you are talking about short or long-term memory. Most people have trouble remembering more than seven numbers in the short term, but with training people can get much much better. Some people teach themselves to remember hundreds of numbers by linking each number to a visual image. This helps as visual memory is better than verbal. We find it easier to remember things we repeat often, so we remember phone numbers we use a lot and not those we do not. Long-term memory is not as reliable as people think, experiments show that though people think they remember their childhood accurately, actually they remember it slightly differently in each decade as they get older. Memory is not a photographic record of events.
Current estimates suggest that the brain can hold between 1 and 1000 terabytes (that is up to 1000 trillion bytes) of information – this estimate is based on numbers of neurons and on the capacity of each neuron. The processing power of the brain is better than that of most supercomputers. Our brains can probably hold much more memory than we realise – there are some people known as savants who can remember incredible amounts (such as whole telephone directories)
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