Intermediate memory covers the time span beginning within a few seconds past and extending backward for 24 to 48 hours. It is much easier to recall what we had for dinner yesterday and the day before, but the memory of what we ate for dinner 3 weeks ago is gone. These are memories already in our brains that need to be reactivated. However, over time long term memories begin to fade. Successful memory retrieval relies on a combination of all three-memory storage systems at any given time.
Memory depends on the survival and healthy functioning of the neurons.
Loss of memory function is related to an interruption of normal neuron function. The interruption can take place at many different stages such as communication between neurons, nourishment and metabolism within the neuron and the repair of injured neurons. Studies suggest that memory peaks between the ages of 20 to 30 followed by a subtle decline. After the age of 60 the memory capacity declines and memory loss becomes more pronounced at the ages of 70 and 80 when a definite decline is noticeable. The pattern of memory loss can be divided into 5 groups.