Unit 8: Memory
How an experience becomes a memory, why some memories fade or distort while others fossilize, and what actually strengthens recall.
11 topics · 41 questions
Each topic is a path, not a menu: work down it in order and every question builds on the one above. Click any of them to watch the answer draw itself.
8.1 Encoding and the Memory Stores Model
- How it worksHow does information flow from sensory memory into short-term memory and then into long-term memory?
- How it worksWalk me through how deep, meaningful encoding creates a stronger memory than shallow, surface encoding.
- Going furtherWhat happens to information sitting in short-term memory if it never gets rehearsed?
Your turn1 of 2
One student studies a vocabulary list by simply reading each word's spelling over and over. Another studies by thinking carefully about each word's meaning and connecting it to something personally familiar. On a later test, the second student remembers far more words. What explains the difference?8.1 Working Memory and Chunking
- How it worksHow does chunking group individual pieces of information into fewer, larger units to fit into working memory?
- Worked exampleFind how chunking turns the twelve digits 1 9 4 1 1 9 6 3 2 0 2 0 into three memorable chunks.
- Going furtherWhat happens to working memory capacity when a person is asked to do two demanding mental tasks at once?
- Common mistakeWhy isn't working memory just a smaller version of long-term memory that holds less information?
Your turn1 of 2
A memory strategy groups a long string of digits into 4 chunks of 4 digits each. How many total digits does that represent?8.1 The Serial Position Effect
- How it worksHow does the primacy effect explain better recall for a list's earliest items?
- How it worksHow does the recency effect explain better recall for a list's most recent items?
- Worked exampleFind how a serial position curve would look for a list of twenty words recalled immediately after hearing them.
- Going furtherWhat happens to the recency effect specifically when recall is delayed by even a short distraction?
Your turn1 of 2
On a twenty-item grocery list read aloud once, a person recalls the first few items and the last few items far better than the items from the middle of the list. What two effects, respectively, best explain the strong recall of the earliest and the most recent items?8.1 Retrieval Cues and the Tip-of-the-Tongue State
- How it worksHow does a retrieval cue reactivate a memory that context helped originally encode?
- Common mistakeWhy doesn't the tip-of-the-tongue state mean the memory itself is actually lost?
- Going furtherWhat happens to recall when you're tested in the same room where you originally studied?
Your turn1 of 2
A student studies for an exam sitting at their kitchen table, but takes the actual exam in a different, unfamiliar classroom, and struggles more than expected to recall the material. What does research on retrieval cues suggest might have helped?8.2 The Hippocampus and Forming New Memories
- How it worksHow does the hippocampus convert short-term memories into stable long-term storage in the cortex?
- Common mistakeWhy isn't the hippocampus itself where old long-term memories are permanently stored?
- Going furtherWhat happens to procedural memories, like riding a bike, in a patient whose hippocampus is destroyed?
- Worked exampleFind which type of memory, a fact or a motor skill, a patient with hippocampal damage can still learn despite their amnesia.
Your turn1 of 2
A famous patient with hippocampal damage could no longer form new declarative memories, like remembering facts or meeting new people, yet when taught a new motor skill through repeated practice over several days, his performance on that skill steadily improved, even though each practice session felt completely unfamiliar to him. What does this pattern reveal?8.2 The Amygdala and Emotional Memory
- How it worksHow does the amygdala tag an emotional experience so the hippocampus encodes it more strongly?
- Going furtherWhat happens to the vividness, but not necessarily the accuracy, of a flashbulb memory over the years?
- Worked exampleFind why a witness to a robbery vividly remembers the gun but can barely describe the robber's face.
Your turn1 of 2
A witness to an armed robbery can describe the gun in extraordinarily vivid detail, down to its exact color and shape, but can barely describe the robber's face at all. What does this pattern illustrate about emotional memory and attention?8.3 The Forgetting Curve
- How it worksHow does Ebbinghaus's forgetting curve drop steeply at first and then level off over time?
- Worked exampleFind roughly how much of a list of nonsense syllables is forgotten within the first hour according to Ebbinghaus's original curve.
- Going furtherWhat happens to the forgetting curve when the same material is reviewed multiple times instead of studied once?
- Worked exampleFind how spaced review sessions flatten Ebbinghaus's forgetting curve compared to a single study session.
Your turn1 of 2
Immediately after learning a list of nonsense syllables, retention is essentially 100 percent. According to a forgetting curve, only 52 percent is still retained after the first hour. How many percentage points of retention were lost in that first hour?8.3 Encoding Failure, Decay, and Interference
- How it worksHow does encoding failure explain forgetting something that was never stored in memory at all?
- How it worksWalk me through how proactive and retroactive interference each disrupt memory in opposite directions.
- Going furtherWhat happens to an old memory when very similar new information is learned right afterward?
- Worked exampleFind why studying French right before a Spanish exam can hurt your Spanish recall through interference.
Your turn1 of 2
A person who used the same email password for ten years now has a new password, but keeps typing the old password by mistake. Separately, after memorizing a new phone number, that same person suddenly has trouble recalling their old, long-familiar phone number. Which type of interference does each situation illustrate, respectively?8.3 Why Memory Isn't a Video Recording
- How it worksHow does reconstructive memory rebuild a past event each time it's recalled, instead of replaying a fixed recording?
- Common mistakeWhy doesn't memory work like a video camera that stores an exact, unedited copy of events?
- Going furtherWhat happens to a memory's details each time it gets reconstructed and re-stored?
- Worked exampleFind why two eyewitnesses to the same robbery can each confidently recall a different color getaway car.
Your turn1 of 2
Someone insists their memory of a childhood birthday party is completely accurate in every detail, comparing it to a video recording that captured the event exactly as it happened. What does memory research say about this comparison?8.3 Eyewitness Testimony and the Misinformation Effect
- How it worksHow does the misinformation effect plant a false detail into an existing memory of an event?
- Worked exampleFind how asking witnesses how fast cars smashed versus how fast they hit changed their estimated speed in Loftus's classic study.
- Going furtherWhat happens to a lineup identification's accuracy when the lineup is run poorly instead of double-blind?
- Common mistakeWhy doesn't a witness's confidence in their memory reliably predict how accurate that memory actually is?
Your turn1 of 2
In a classic study, witnesses asked how fast two cars were going when they 'smashed' into each other estimated an average speed of 43 miles per hour, while witnesses asked the same question using the word 'hit' instead estimated an average of 33 miles per hour. How many more miles per hour did the 'smashed' wording add to the average estimate?8.4 Mnemonic Devices and Elevated Encoding
- How it worksHow does the method of loci use a familiar space to store and retrieve a long list of items?
- How it worksWalk me through why self-referencing information to your own life makes it easier to remember later.
- Going furtherWhat happens to long-term retention when studying is spread out over several days instead of crammed into one?
- Worked exampleFind how the method of loci could turn a grocery list of milk, bread, eggs, and apples into stops along a familiar walk through your house.
Your turn1 of 2
To memorize a grocery list of milk, bread, eggs, and apples, someone mentally places milk at their front door, bread in the hallway, eggs in the kitchen, and apples on the dining table, then imagines walking through this familiar route to recall the items in order. What memory technique is being used?