🧠 Why Do We Have Problems Remembering?
Most people experience memory problems sometimes.
Examples:
- Forgetting someone's name
- Forgetting where you put your keys
- Remembering an event differently from someone else
- Being certain about something that did not actually happen
Memory is not like a video recording. Instead, the brain reconstructs memories each time we remember something. This means memories can change over time.
1. Amnesia
🧠 What Is Amnesia?
Amnesia is a loss of long-term memory caused by:
- Brain injury
- Disease
- Physical trauma
- Psychological trauma
People with amnesia may lose memories from their past, or they may struggle to create new memories.
A famous case was K.C., studied by psychologist Endel Tulving.
After a motorcycle accident, K.C. could not remember events from his own life. He could remember facts and skills but could not remember personal experiences.
The Two Types of Amnesia
There are two main types:
| Type | What Happens? | Example |
|---|---|---|
| Anterograde amnesia | Cannot form new memories after the injury | Cannot remember meeting someone new |
| Retrograde amnesia | Loses memories from before the injury | Cannot remember childhood or past events |
2. Anterograde Amnesia
🧠 What Is It?
Anterograde amnesia means a person cannot create new long-term memories after an injury.
The person may remember their past but struggles with new information.
It is often linked to damage in the:
🧠 Hippocampus
The hippocampus helps transfer information from:
Short-term memory → Long-term memory
This process is called:
Consolidation
Example: Henry Molaison
H.M. had brain surgery to treat epilepsy.
After surgery:
- He could remember things from before the operation.
- He could not remember new people he met.
- He repeatedly read the same magazine because he forgot reading it.
However, he could still learn some skills.
Example:
He became better at solving a puzzle each day even though he did not remember practicing it.
This showed that:
- Procedural memory (skills) can work.
- Episodic memory (personal experiences) can be damaged.
3. Retrograde Amnesia
🧠 What Is It?
Retrograde amnesia is the loss of memories from before the injury.
A person may forget:
- Personal history
- Family memories
- Important life events
Example:
Someone wakes up after a head injury and does not recognise their family.
Example: Scott Bolzan
After hitting his head, Scott Bolzan lost many years of personal memories.
He could not remember important parts of his previous life.
4. Memory Construction and Reconstruction
🧩 Memories Change Over Time
When we create memories, this is called:
Construction
When we remember something, this is called:
Reconstruction
However, memories can change when we recall them.
The brain may:
- Add new information
- Remove details
- Mix memories together
- Fill in missing information
People are not always trying to lie.
The brain can naturally change memories.
5. Suggestibility
🧠 What Is Suggestibility?
Suggestibility happens when outside information changes someone's memory.
A person may remember something because:
- Someone suggested it
- They saw it on the news
- Someone asked leading questions
This can create:
False memories
A false memory is when someone remembers something that did not actually happen.
Example: The White Van Case
During the Washington, D.C. sniper attacks:
- Police mentioned a white van connected to the crime.
- Many people then reported seeing a white van.
- People focused on white vans because of the suggestion.
Later, the suspects were found in a:
🚗 Blue sedan
The suggestion changed what people believed they remembered.
6. Eyewitness Testimony Problems
👁️ What Is Eyewitness Testimony?
Eyewitness testimony is when someone describes what they saw during a crime.
Courts often use eyewitness accounts.
However, memory can be unreliable.
A person may:
- Forget details
- Misidentify someone
- Become more confident over time
- Be influenced by suggestions
Eyewitness Misidentification
Wrong identification can lead to:
❌ Wrongful convictions
❌ Innocent people going to prison
Research from the Innocence Project found that eyewitness mistakes are one of the leading causes of wrongful convictions involving DNA evidence.
Example: Jennifer Thompson and Ronald Cotton
In 1984:
- Jennifer Thompson was attacked and tried to remember the attacker’s face.
- She identified Ronald Cotton as the attacker.
- Cotton was convicted and imprisoned.
However:
DNA evidence later proved:
✅ Ronald Cotton was innocent.
He spent more than 10 years in prison for a crime he did not commit.
Why Did the Mistake Happen?
Research suggests memory can be affected by:
1. Police suggestions
Example:
- "Are you sure?"
- "You picked the right person."
2. Lineup problems
Example:
- Making one person stand out.
3. Confidence changes
A witness may become more confident after receiving confirmation.
7. Memory Errors Summary
| Memory Problem | Meaning |
|---|---|
| Amnesia | Loss of memory |
| Anterograde amnesia | Cannot create new memories |
| Retrograde amnesia | Loss of memories from the past |
| Suggestibility | Outside information changes memory |
| False memory | Remembering something that did not happen |
| Eyewitness misidentification | Incorrectly identifying someone |
Key Psychology Idea ⭐
Memory is not a perfect recording of the past. It is an active process where the brain rebuilds information.
This helps us adapt and learn, but it also means memories can sometimes become inaccurate.
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