Declarative memory

Explicit memory (or declarative memory) is one of the two main types of long-term human memory. It is the conscious, intentional recollection of factual information, previous experiences and concepts. Explicit memory can be divided into two categories: episodic memory, which stores specific personal experiences, and semantic memory, which stores factual information.

Declarative memory's counterpart is known as implicit memory or procedural memory, which refers to unconscious memories such as skills (e.g. learning to ride a bicycle).

People use explicit memory throughout the day, such as remembering the time of an appointment or recollecting an event from years ago. Explicit memory involves conscious recollection, compared with implicit memory which is an unconscious, unintentional form of memory. Remembering a specific driving lesson is an example of explicit memory, while improved driving skill as a result of the lesson is an example of implicit memory.

Sometimes, the distinction between explicit memory and declarative memory is made. In such cases, explicit memory relates to any kind of conscious memory, and declarative memory relates to any kind of memory that can be described in words; however, if we assume that a memory cannot be described without being conscious and vice versa, then the two concepts are identical.

Episodic memory consists of the storage and recollection of observational information attached to specific life-events. These can be memories that happened to the subject directly or just memories of events that happened around them. Episodic memory allows for mental time travel – recalling various contextual and situational details of one's previous experiences.

Some examples of episodic memory include the memory of entering a specific classroom for the first time, the memory of storing your carry-on baggage while boarding a plane headed to a specific destination on a specific day and time, the memory of being notified that you are being terminated from your job, or the memory of notifying a subordinate that they are being terminated from their job. The retrieval of these episodic memories can be thought of as the action of mentally reliving in detail the past events that they concern. Episodic memory is believed to be the system that provides the basic support for semantic memory.

Semantic memory refers to general world knowledge (facts, ideas, meaning and concepts) that can be articulated and is independent of personal experience. This includes world knowledge, object knowledge, language knowledge, and conceptual priming. Semantic memory is distinct from episodic memory, which is our memory of experiences and specific events that occur during our lives, from which we can recreate at any given point. For instance, semantic memory might contain information about what a cat is, whereas episodic memory might contain a specific memory of petting a particular cat. We can learn about new concepts by applying our knowledge learned from things in the past.

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