Welcome to the World of Memory!
Ever wondered why you can remember the lyrics to a song from five years ago but forget what you had for breakfast yesterday? Memory is one of the most fascinating parts of Psychology. In this chapter, we’ll explore how your brain takes in information, stores it, and sometimes lets it slip away. Don't worry if it seems like a lot to take in—we'll break it down into bite-sized chunks!
1. The Multi-Store Model (MSM)
Think of the Multi-Store Model (proposed by Atkinson and Shiffrin) as a "mail delivery system" for your brain. Information has to pass through different "offices" before it can be stored forever.
Three Key Features of Every Store:
1. Coding: The form in which the info is stored (e.g., sound or pictures).
2. Capacity: How much information the store can hold.
3. Duration: How long the information stays there.
The Three Stores:
A. The Sensory Register
This is the "waiting room." It takes in everything from your senses (eyes, ears, etc.).
Coding: Depends on the sense (e.g., iconic for visual, echoic for sound).
Capacity: Very high (it takes in everything!).
Duration: Very short (less than half a second).
B. Short-Term Memory (STM)
This is what you are thinking about right now. If you pay attention to something in the sensory register, it moves here.
Coding: Mainly acoustic (based on sound).
Capacity: Limited. Usually \( 7 \pm 2 \) items (between 5 and 9).
Duration: About 18 to 30 seconds (unless you rehearse it!).
C. Long-Term Memory (LTM)
This is the "permanent warehouse." If you rehearse (repeat) info enough, it moves here.
Coding: Mainly semantic (based on meaning).
Capacity: Unlimited.
Duration: Potentially a lifetime.
Quick Review Box:
- Attention moves info from Sensory to STM.
- Rehearsal moves info from STM to LTM.
- Tip: If you want to remember a phone number, you repeat it over and over—that is maintenance rehearsal!
Key Takeaway: The MSM sees memory as a linear flow. If you don't pay attention or rehearse, the information is lost!
2. Types of Long-Term Memory (LTM)
Psychologists discovered that we don't just have one big "bucket" for long-term memories. There are actually different types!
1. Episodic Memory
These are memories of "episodes" or events from your life.
Example: Your 10th birthday party or what you did last weekend.
Key Point: These are time-stamped (you remember when they happened) and require conscious effort to recall.
2. Semantic Memory
This is your "mental dictionary." It stores facts and knowledge.
Example: Knowing that Paris is the capital of France or that 2 + 2 = 4.
Key Point: These aren't usually time-stamped; you just "know" them.
3. Procedural Memory
These are memories of "how to do things" or skills.
Example: Riding a bike, tying your shoelaces, or typing on a keyboard.
Key Point: These are unconscious. You don't have to think hard about the steps once you've learned them.
Did you know? Some brain-damaged patients can forget their name (semantic/episodic) but can still play the piano perfectly (procedural)! This proves these memories are stored in different places.
3. The Working Memory Model (WMM)
While the MSM says Short-Term Memory is just one simple "store," the Working Memory Model (Baddeley and Hitch) says it’s much more active—like a mental workbench.
The Components:
1. Central Executive
The "Boss." It monitors incoming data and decides which "assistant" should handle it. It has a very limited capacity.
2. Phonological Loop
The "Inner Ear." It deals with spoken and written material.
- Phonological Store: Stores the words you hear.
- Articulatory Process: Your "Inner Voice" that repeats words to keep them in memory.
3. Visuo-Spatial Sketchpad
The "Inner Eye." It deals with visual and spatial info (e.g., picturing your house layout).
- Visual Cache: Stores visual data (shapes/colors).
- Inner Scribe: Records the arrangement of objects.
4. Episodic Buffer
The "Bridge." Added later by Baddeley. It brings together information from the other components and sends it to Long-Term Memory.
Memory Trick: Think of the Central Executive as a CEO and the others as different departments (Audio, Video, and Shipping). They all have to work together but can only do so much at once!
Key Takeaway: If you try to do two visual tasks at once (like texting while driving), you'll struggle because they use the same "department." But you can listen to music (audio) while cleaning (spatial) quite easily!
4. Why Do We Forget?
Forgetting isn't just "losing" a memory; usually, we just can't find it or it gets mixed up.
A. Interference
This happens when one memory gets in the way of another. This is most likely to happen with similar information (like two different phone numbers).
Proactive Interference: Old memories block new ones.
Example: You get a new phone number but keep telling people your old one.
Retroactive Interference: New memories block old ones.
Example: You learn a new dance routine and suddenly can't remember the one you learned last month.
B. Retrieval Failure (Cues)
The memory is there, but you're missing the "key" to unlock it. These keys are called cues.
Context-Dependent Forgetting: You forget because you are in a different place.
Example: Walking into a room and forgetting why you went there, only to remember when you go back to the original room!
State-Dependent Forgetting: You forget because you are in a different physical or emotional state.
Example: If you learn something while you are very happy, you might forget it when you are sad.
Summary: Forgetting is often about Interference (mixing up) or Retrieval Failure (missing cues).
5. Eyewitness Testimony (EWT)
How reliable are witnesses in court? Psychology says... not as reliable as we think!
Factors Affecting Accuracy:
1. Misleading Information
- Leading Questions: Questions that suggest a certain answer. In a famous study by Loftus and Palmer, participants watched a car crash. Those asked how fast the car was going when it "smashed" reported higher speeds than those asked how fast it was going when it "hit."
- Post-event Discussion: When witnesses talk to each other after an event, their memories can become contaminated or mixed together.
2. Anxiety
Does being scared help or hurt memory?
- The "Weapon Focus" Effect: If a person has a gun, you might focus so much on the weapon that you forget what the person’s face looked like.
- The Inverted-U: High anxiety helps memory up to a point, but if you get too stressed, your memory gets worse.
6. Improving Accuracy: The Cognitive Interview
Psychologists developed a special way for police to interview witnesses to get more accurate information.
The Four Techniques:
1. Report Everything: Tell even the tiny, "unimportant" details.
2. Reinstate the Context: Mentally put yourself back at the scene (picture the weather, your feelings).
3. Reverse the Order: Describe the event from the end to the beginning (this prevents people from using their expectations of what "usually" happens).
4. Change Perspective: Imagine the scene from the view of another witness.
Common Mistake to Avoid: Don't confuse the Cognitive Interview with a standard police interview! The Cognitive Interview is slower and gives the witness more control.
Key Takeaway: Memory is reconstructive—it’s like a puzzle we put back together every time we remember. The Cognitive Interview helps us find more puzzle pieces!