Memory and Forgetting - Lecture 4

Lecture 4 worked through how memories are formed, held on to and recovered, and why the last of those is where most of it goes wrong. The notes below follow the lecture in order and close on what to revise for the exam.

Three stages of memory
- Encoding, storage and retrieval - most everyday failures happen at retrieval.
- The memory is usually still there; the right cue brings it back.
Working memory is the bottleneck
- Miller put the limit at seven items give or take two; newer estimates are nearer four.
- Chunking gets round it - which is why phone numbers are written in groups.
Context and revision
- Revising where you will sit the exam helps a little, but far less than people assume.
- How you space revision matters more than where you do it.
Exam pointers
- Know the spacing effect from the testing effect - they are easy to confuse and come up most years.

Read the transcript

Dr. Reid 0:00

Right, let's pick up where we left off. Last week was attention; today it's memory - how it gets in, how it stays, and why it comes out wrong.

Dr. Reid 0:09

Psychologists split it into three stages: encoding, storage and retrieval. Most everyday failures are retrieval failures, not lost memories.

Priya 0:18

So when a name is on the tip of your tongue, that's retrieval?

Dr. Reid 0:22

Exactly. A classic retrieval failure - the memory is there, you just can't reach it. Give yourself the first letter and it usually turns up.

Tom 0:31

Is that why people say to revise in the same room you'll sit the exam in?

Dr. Reid 0:36

That's context-dependent memory. The effect is real, but it is small - how you space your revision matters a great deal more.

Dr. Reid 0:46

Working memory is the bottleneck. Miller said seven items give or take two; more recent work puts it nearer four.

Priya 0:55

Is chunking why phone numbers are written in groups?

Dr. Reid 0:59

Precisely. And for the exam - know the spacing effect from the testing effect. They are easy to confuse and they come up most years.

Card 1 of 4

How well you knew it is asked after you reveal the answer.

Deck finished

Question 1 of 2

Three stages of memory

Where do most everyday memory failures happen?

Encoding

Encoding failures are real, but the lecture's point was that the material usually did go in - what fails is getting it back out.

Storage

This assumes the memory decayed away. The tip-of-the-tongue example shows it is still there, waiting for the right cue.

Retrieval

The memory is still there; the cue is missing. Being given the first letter of a name is usually enough to recover it.

Consolidation

Consolidation is how a memory stabilises after encoding - a real stage, but not the one identified as the common failure point.

Why not the others?

Context and revision

Which matters more for how well revision sticks?

Revising in the room you will sit the exam in

This is context-dependent memory. The effect is real but small next to spacing.

Spacing revision across separate sessions

The lecture's own comparison: how you space revision matters a great deal more than where you do it.

Revising at the same time of day each time

Time of day was not among the effects discussed - this borrows the form of the context argument without its evidence.

Revising with the same people each time

Social context can cue recall a little, but like physical context it is small next to spacing.

Why not the others?

Worth another look

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Memory and Forgetting - Lecture 4

Three stages of memory

Working memory is the bottleneck

Context and revision

Exam pointers

Deck finished