6.4.3. Long-term Memory

Long-term memory (abbreviated as LTM) is a permanent storehouse of all information that may be as recent as what you ate for breakfast yesterday to as distant as how you celebrated your sixth birthday. It has been shown that once any information enters the long-term memory store it is never forgotten because it gets encoded semantically, i.e., in terms of the meaning that any information carries.

Long-term memory is where we store information for an extended period, sometimes for a lifetime. It can hold a vast array of memories, from recent events like what we had for breakfast to distant memories from childhood, like birthday celebrations. The essential point about long-term memory is that when information is properly encoded, it can remain accessible indefinitely. This encoding typically focuses on the meaning of the information rather than just how it sounds or looks. As a result, many people think they might have forgotten something when, in fact, they just can't retrieve it, which is known as retrieval failure.

Imagine trying to recall the lyrics of a song you loved as a child. While you may struggle to remember the words on the spot, you might be able to sing along perfectly if the song starts playing. This illustrates how long-term memory retains the information though it feels temporarily inaccessible when you need it.

From the STM, information enters the long-term memory through elaborative rehearsals. As against maintenance rehearsals, which are carried through silent or vocal repetition, this rehearsal attempts to connect the ‘to be retained information’ to the already existing information in long-term memory.

To move information from short-term memory (STM) to long-term memory (LTM), we need a process called elaborative rehearsal. Unlike maintenance rehearsal, which focuses on repeating information to keep it active in STM, elaborative rehearsal helps us understand and connect new information with what we already know. For example, if you learn a new term in a subject, associating it with similar terms or concepts helps in its better retention because it creates a web of understanding around that term, making it easier to retrieve later.

Think of learning a new concept in math, like fractions. Instead of just repeating that 1/2 means half, you relate it to real-life experiences, like sharing a pizza. By understanding that splitting a pizza into two equal parts gives each person half, you can remember the concept of 1/2 much more easily.

Contemporary formulations envisage long-term memory as consisting of various types. For instance, one major classification within the LTM is that of Declarative and Procedural memories.

Long-term memory is not a single entity but can be distinguished into different types based on the nature of the information stored. Declarative memory includes facts and knowledge (like recalling a historical date), while procedural memory relates to skills and actions (like riding a bike or typing). Declarative memory can be further broken down into episodic memory (personal experiences) and semantic memory (general knowledge). This classification highlights that different memories depend on various cognitive processes and retrieval methods.

Consider how you know how to ride a bike (procedural memory) versus how you can tell someone about your first bike ride (episodic memory). The ability to ride is a skill you've developed and stored in procedural memory, while the story of that experience involves episodic memory, showcasing how different types of memories serve unique purposes in our lives.

Forgetting can occur not only because the memory traces have decayed over time or because independent sets of stored associations compete at the time of recall but also because at the time of recall, either the retrieval cues are absent or they are inappropriate.

Forgetting isn't just about losing memories over time. Sometimes, we fail to remember things not because we didn't learn them well, but because we don't have the right retrieval cues to access that information. Retrieval cues are hints or prompts that help us find the information stored in our long-term memory. If these cues are missing or not suitable, recalling a memory can be quite challenging. Effective studying involves creating strong connections that can later serve as retrieval cues.

Imagine you're trying to find a book in a library, but you don't remember the title—only where it was shelved. If someone gives you clues about the section or the author's first name, it could prompt the right memory, helping you locate the book. Similarly, in learning, effective cues help trigger memories when you need them, just like a friend’s hint can guide you back to what you previously learned.

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