Types of Long-Term Memory

Types of Long-Term Memory

Research has shown that long-term memory (LTM) is not a single store — it consists of at least three distinct types. Tulving (1985) proposed this distinction based on the kind of information stored.

The Three Types of LTM

Type	What It Stores	Example	Conscious?
Episodic memory	Personal experiences and events — time-stamped, like a diary	Your last birthday party, your first day at secondary school	Yes — requires conscious, deliberate recall
Semantic memory	Facts, knowledge and meaning — like an encyclopedia	London is the capital of England, 2 + 2 = 4	Yes — requires conscious recall, but feels effortless
Procedural memory	Skills and actions — "how to" knowledge	Riding a bike, tying shoelaces, typing on a keyboard	No — automatic, does not require conscious thought

Episodic Memory in Detail

• Stores autobiographical events — things that happened to you personally
• Includes the context: when it happened, where you were, who was there, how you felt
• Must be consciously recalled — you actively think back to the event
• Memories can be unreliable — they may be distorted over time or by suggestion
• Example: remembering what you had for dinner last night

Semantic Memory in Detail

• Stores general knowledge and facts — not tied to personal experience
• Includes concepts, language, rules and categories
• Does not require you to remember when or where you learned the information
• Less vulnerable to forgetting than episodic memory — facts tend to be more stable
• Example: knowing that Paris is in France (you may not remember when you learned this)

Procedural Memory in Detail

• Stores motor skills and learned procedures — actions you perform without thinking
• Implicit (unconscious) — you do not need to deliberately recall how to do it
• Very resistant to forgetting — once learned, skills are rarely lost ("it's like riding a bike")
• Difficult to explain verbally — try describing exactly how you tie your shoes
• Example: playing a musical instrument, driving a car

Evidence for Different Types of LTM

Case study of Clive Wearing:

• Clive suffered brain damage from a viral infection (herpes encephalitis) that destroyed parts of his hippocampus
• He lost his episodic memory — he cannot remember events from his past or form new episodic memories
• His procedural memory is intact — he can still play the piano expertly
• Some semantic memory is preserved — he knows facts and can speak fluently
• This shows that the three types of LTM are stored in different brain areas and can be independently damaged

Brain scan studies:

• Episodic memory is associated with the hippocampus and prefrontal cortex
• Semantic memory is associated with the temporal lobe
• Procedural memory is associated with the cerebellum and basal ganglia
• Different brain areas being active for different memory types supports them being separate systems

Strengths of the Types of LTM Model

• Clinical evidence — case studies like Clive Wearing show that one type of LTM can be damaged while others remain intact
• Brain scan support — neuroimaging shows different brain regions are active for each type
• Practical applications — understanding procedural memory helps in rehabilitation (patients who cannot form new episodic memories can still learn new skills)
• Improves on the MSM — provides a more detailed and accurate picture of LTM than treating it as a single store

Weaknesses

• Case studies — single cases (like Clive Wearing) may not be generalisable to the whole population
• Overlapping types — the distinction between episodic and semantic memory is not always clear (e.g. remembering a fact might trigger a personal memory of learning it)
• Reductionist — there may be even more types of LTM that have not yet been identified

Exam Tips

• Learn the three types with clear definitions and examples
• Use the Clive Wearing case study as key evidence — it shows types are separate
• For AO3: the model is well-supported but case studies have limitations (small sample, unique circumstances)
• Common question: "Explain the difference between episodic, semantic and procedural memory" — use the table format for clarity