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Explanations for Forgetting

Forgetting refers to the loss or inability to access stored information in memory. Psychologists have proposed several core explanations, focusing mainly on the mechanisms of interference and retrieval failure. The following sections detail these theories and their empirical support.

The Forgetting Landscape

1

Interference Theory

Memory traces compete (Proactive & Retroactive effects).
2

Retrieval Failure

Stored memories are inaccessible due to lack of appropriate cues.
3

Empirical Evidence

Studies supporting cue-dependent forgetting (Godden & Baddeley).

Core Definition of Forgetting

Why we forget

Forgetting refers to the loss or inability to access stored information in memory. Psychologists focus mainly on interference and retrieval failure as the primary mechanisms.

Key Terminology

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Proactive Interference (PI)

Old memories interfere with new learning/retrieval.
👶

Retroactive Interference (RI)

New learning interferes with the recall of old information.
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Encoding Specificity

Cues at encoding must match those at retrieval for best access.
🚪

Retrieval Failure

Memories are stored but inaccessible due to lack of appropriate cues.

Interference & Similarity

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How do we know similarity increases interference?
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McGeoch and McDonald (1931) showed participants who learned lists similar to the original list experienced much more forgetting.
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Does the passage of time matter as much as interference?
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Baddeley and Hitch (1977) found rugby players' forgetting of team names was more affected by the number of intervening games (interference) than time elapsed.

Retrieval Principle (Tulving, 1973)

Retrieval Success ∝ (Cues at Encoding) ∩ (Cues at Retrieval)
This is the Encoding Specificity Principle, stating that retrieval is most effective when the cues present at encoding are also available at retrieval.

Cues: External vs. Internal

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Context-Dependent Forgetting Occurs when the external environment (e.g., location, room, smell) at recall differs from encoding. (Godden and Baddeley, 1975: Divers experiment).
❌
State-Dependent Forgetting Occurs when an individual’s internal state (e.g., mood, intoxication, arousal) differs during recall. (Goodwin et al., 1969: Sober/Drunk testing).

Limitation Warning: Interference

⚠️

The Flaw of Interference: Interference mainly explains forgetting where similarity of information exists but cannot explain all types of forgetting such as cue-dependent forgetting, which requires Retrieval Failure Theory.

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Forgetting Theory Deck
Q
What is forgetting?

What is forgetting?

A
Answer

The loss or inability to access stored information in memory.

Q
Interference Theory

What does the interference theory suggest about forgetting?

A
Answer

Forgetting occurs because one memory disrupts the recall of another, especially when memories are similar.

Q
Proactive Interference

What is proactive interference (PI)?

A
Answer

When old memories interfere with the learning or recall of new information.

Q
Retroactive Interference

What is retroactive interference (RI)?

A
Answer

When new learning interferes with the recall of old information.

Q
Effect of Similarity

How does similarity affect interference?

A
Answer

More similar memories cause greater interference, making retrieval harder.

Q
McGeoch and McDonald (1931)

What was the key finding of McGeoch and McDonald (1931)?

A
Answer

Similarity between learned lists increased forgetting due to interference.

Q
Baddeley and Hitch Rugby Study

What did Baddeley and Hitch's rugby study reveal about interference?

A
Answer

Forgetting was influenced more by interference from intervening games than by time.

Q
Retrieval Failure

What is retrieval failure?

A
Answer

When memories are stored but inaccessible due to missing retrieval cues.

Q
Encoding Specificity Principle

What is the encoding specificity principle?

A
Answer

Memory retrieval works best when cues present during learning are also present at recall.

Q
Context-dependent Forgetting

What is context-dependent forgetting?

A
Answer

Forgetting that occurs when the external environment at recall differs from learning.

Q
State-dependent Forgetting

What is state-dependent forgetting?

A
Answer

Forgetting caused by a difference in a person's internal state between learning and recall.

Q
Godden and Baddeley (1975)

What did Godden and Baddeley (1975) find about context-dependent forgetting?

A
Answer

Recall was better when learning and testing contexts matched (underwater or on land).

Q
Goodwin et al. (1969)

How did Goodwin et al. (1969) demonstrate state-dependent forgetting?

A
Answer

Participants recalled memories better when testing matched their sobriety or intoxication state during learning.

Q
Limitations of Interference Theory

What types of forgetting can interference theory not explain?

A
Answer

Cue-dependent forgetting like retrieval failure.

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🧠 Memory & Forgetting Quiz

1. What does proactive interference refer to?

Proactive interference describes old memories disrupting the learning or retrieval of new memories.

2. Which study demonstrated that forgetting increases when the learned and recalled materials are similar?

McGeoch and McDonald found similarity increased interference and forgetting.

3. According to the encoding specificity principle, memory retrieval is most effective when:

Tulving’s principle states that matching cues at learning and recall enhance retrieval.

4. State-dependent forgetting occurs when:

Differences in internal states impair retrieval.

5. Which explanation best accounts for forgetting names temporarily in daily life?

Retrieval failure from missing cues explains temporary forgetting.

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