The learning and experiences that each of us acquires throughout life makes the nervous system "store" information. Memory is the storage and / or retrieval of this information. When memory problems appear, we then speak of amnesia (partial or total).

There are three temporal categories of memory

There are three different types of memory depending on their ability to keep the new information: sensory memory, short-term memory and long-term memory. These three types of memory collaborate with each other for the memorization process.

The sensory memory very briefly preserves the information provided by the senses (sight, smell, touch ...). Its duration is of the order of a few hundred milliseconds to one or two seconds. Sensory memory is essential for the installation of short-term memory.

The short-term memory lasts a few tens of seconds. During this short period, it allows you to register a new face or a phone number. Short-term memory will allow access to a more advanced stage of storage: long-term memory. This process of passage would be facilitated by a conscious work of repetition of the new information. Thus, the term "working memory" is also used to qualify this short-term memory.

Long-term memory can last for months, years, and even all of life. However, it declines with age.
Long-term memory is also divided into two major types that are not located in the same brain regions: implicit memory and explicit memory.

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