Memory can be classified into different types namely:
1. Sensory memory
2. Primary memory
3. Secondary memory.
1. Sensory memory
This is the ability to retain sensory signals in the sensory areas of brain.
The sensory signals are retained only for a short period after the actual
sensory experience i.e. few hundred milliseconds. But, the signals can be
replaced by new sensory signals in less than one second.
This is the initial stage of memory.
2. Primary memory
It is the memory of facts, words, numbers, letters or other information
received for a few seconds to few minutes at a time. For example, after
searching for a telephone number in the directory, we remember the number
for a short while. After appreciating a beautiful scenery, the details could be
recalled for sometime or days. Afterwards it disappears from the memory.
The characteristic feature of this type of memory is that the information is
available for recall easily from memory store itself. One need not search or
squeeze through the mind and, this memory can be easily replaced by new
bits of memory i.e.. by looking into another telephone number, the first one
might disappear.
3. Secondary Memory
This is the storage of information in the brain for a longer period. The
information could be recalled after hours, days, months or years. This is also
called fixed memory or permanent memory.
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