Vanishing Act Slides Classified
THE VANISHING
ACT
Case File: Memory Decay & Interference
Subject: Cognitive Psychology / Memory Reliability
The Memory Jam
Why did you forget the milk but remember the hammer?
"New information doesn't just fill space—it pushes old information out or gets tangled in it."
INTERFERENCE
The mental "gridlock" that occurs when competing memories battle for retrieval.
Evidence: The Forgetting Curve
Hermann Ebbinghaus (1885)
Rapid Loss at Start Slow Decay Later Time Since Learning % Retained
The 20-Minute Drop
Memory loss is exponential. We lose about 40% of new data in the first 20 minutes.
The Level Off
What remains after 24 hours tends to stay stable for much longer.
Types of Interference
Proactive
"The Old Blocks the New"
Old memories disrupt the learning of new information.
Example:
Trying to learn a new phone number but accidentally dialing your old one.
Retroactive
"The New Blocks the Old"
New memories disrupt the recall of older information.
Example:
Learning a second language makes it harder to remember vocabulary from the first one you learned.
Case Investigation
Open your Recall Disruptor files. We are about to test your brain's ability to resist interference.
1
Memory Phase
2
Disruption Phase
3
Retrieval Phase
Recall Disruptor Worksheet TOP SECRET
Recall Disruptor Activity
Investigative Evidence File #001-FORGET
AGENT NAME: ____________________________
DATE: _________________________________
1
Phase 1: Initial Encoding (The Grocery List)
Listen as your teacher reads List A . Once they finish, wait for the signal, then list as many items as you can recall in the space below.
2
Phase 2: The Disruptor (The Hardware List)
Now, listen to List B . Do not write anything during this phase. After listening, complete the mental math challenge below before proceeding.
Mental Math Speed Trial:
1. (14 x 3) + 7 = _____ 2. (100 - 15) / 5 = _____ 3. 24 + 12 = _____
3
Phase 3: Delayed Retrieval (Dual Recall)
Attempt to recall items from List A (left) and List B (right). Notice which list feels clearer and if items from one list are "intruding" on the other.
Recall: List A (Grocery)
Recall: List B (Hardware)
Investigative Debrief
1. Analyze your results. Which list was easier to recall? Why do you think that is?
2. In your own words, define "Retroactive Interference." How did Phase 2 specifically illustrate this concept relative to List A?
3. Ebbinghaus Forgetting Curve: If you were tested on these lists again in 24 hours without looking at them, what percentage of the data would you expect to retain? Explain why based on the curve's shape.
Case Hypothesis
Imagine you are a detective. A witness claims to remember the exact license plate of a car from a week ago, but they have seen hundreds of license plates since then.
Based on interference theory, is this witness likely to be 100% accurate? Why or why not?
Memory Mechanics Teacher Guide Teacher Facilitation Guide
Lesson 1: The Vanishing Act
Duration
60 MIN
Learning Objectives
Identify the exponential nature of memory decay using Ebbinghaus’s Forgetting Curve.
Distinguish between proactive and retroactive interference through experimental simulation.
Analyze how interference impacts the reliability of long-term memory recall.
Materials Needed
Vanishing Act Slides
Recall Disruptor Worksheet
Stopwatch/Timer
Interference Word Lists
1. The Hook: The Memory Jam (10 mins)
Read List A (Grocery List) to the class at a steady pace (1 word per 2 seconds). List A: Milk, Eggs, Bread, Spinach, Apples, Tuna, Butter, Cereal, Yogurt, Coffee.
Ask students to record their recall on the worksheet. Briefly discuss: "Who remembered the first word? The last? Why?"
2. Instruction: Decay & Ebbinghaus (15 mins)
Use the Vanishing Act Slides to introduce Ebbinghaus. Focus on the idea that memory loss is not linear but exponential. Highlight that "forgetting" isn't always losing information—it's often a failure of retrieval .
3. Activity: The Interference Challenge (20 mins)
Read List B (Hardware List) . Tell students NOT to write it down. List B: Hammer, Nails, Screws, Plywood, Drill, Level, Wrench, Paint, Sandpaper, Shovel.
Immediately have them do the mental math on the worksheet. This prevents "rehearsal" and creates a cognitive load.
Finally, ask them to recall BOTH lists. They will likely find that List B (new info) makes List A (old info) harder to remember—this is Retroactive Interference .
4. Synthesis & Discussion (15 mins)
Review the types of interference. Ask: "If you studied for your Psych test then immediately played a video game with complex mechanics, what kind of interference might occur?" (Retroactive).
Interference Concept Check (Key)
Proactive:
Old blocks New. (Example: Writing '2025' when it's already '2026').
Retroactive:
New blocks Old. (Example: Our Hardware list blocking the Grocery list).
Architect Brain Slides EXHIBIT B
THE ARCHITECT
BRAIN
Case File: Reconstruction & Schema Theory
Focus: How the brain builds memories instead of recording them.
The Memory Myth
Reproduction
The belief that memory works like a video camera—recording exactly what happened for later playback.
Reconstruction
The reality that the brain acts like an architect—assembling pieces of information and filling in gaps with logic.
Schema: The Mental Blueprint
A SCHEMA is a mental framework or "shortcut" that helps us organize and interpret information.
Office Schema
You expect to see a desk, computer, and chair. If they are missing, your brain might "remember" them anyway.
Restaurant Schema
You know to wait for a host, look at a menu, and pay at the end. You fill in gaps based on this script.
Social Schema
Stereotypes or expectations about how people behave in certain situations.
Case Study: War of the Ghosts
Frederic Bartlett (1932)
Bartlett had British participants read a Native American folk tale with unfamiliar cultural concepts.
Shortening: The story got shorter as details were dropped.
Rationalization: "Canoes" became "boats". "Hunting seals" became "fishing".
The Discovery
"Memory is an imaginative reconstruction... not a reproduction of past experience."
Key Finding
Coherence > Accuracy
Your brain hates gaps. It would rather tell a logical story that makes sense than report an accurate story that is confusing.
Prepare for the Telephone Experiment
Schema Blueprint Worksheet Schema Blueprint
Cognitive Architecture Log: Subject #002-ARCH
Confidential: Internal Use Only
ARCHITECT (Name): ________________________________ DATE: ______________
Trial 1: The Expectation Gap
Look at the image provided by your teacher (or the mental image of a "High School Classroom"). Without looking at a real room, list 6 items your Schema tells you must be there.
1. __________________
2. __________________
3. __________________
4. __________________
5. __________________
6. __________________
Analysis:
If you walked into a classroom and saw a coffee maker but no desks, why would you be more likely to "remember" the desks later and forget the coffee maker?
Trial 2: "War of the Ghosts" Reconstruction
Listen to the story read aloud. After the "Telephone" chain, record the final version of the story below as it was heard by the last person.
Final Transcript Area
Identify One "Rationalization":
(Where did the brain change a weird detail to make it "logical"?)
Identify One "Leveling":
(Which details were dropped entirely because they didn't fit a schema?)
Architectural Conclusion
1. Describe how your personal schemas (cultural, social, or academic) might act as "filters" for new experiences. Provide a concrete example.
The Reliability Verdict
If memory is reconstructive (built from pieces) rather than reproductive (a exact copy), can we ever truly trust a "vivid" memory? How does Bartlett’s experiment challenge the idea of an "unbiased" witness?
Ghost Story Teacher Guide Teacher Facilitation Guide
Lesson 2: The Architect Brain
Exhibit
B
Learning Objectives
Define "Schema Theory" and explain its role in memory organization.
Analyze Bartlett's "War of the Ghosts" experiment to identify reconstructive errors.
Evaluate how cultural and social schemas distort details to achieve "coherence."
Prep Checklist
Architect Brain Slides
"War of the Ghosts" Text
Schema Blueprint Worksheet
1. The Hook: Complex Telephone (15 mins)
Select 5 students. Read a short, detail-heavy story to the first student (outside the room or whispered).
Sample Hook Story: "The red truck sped past the library at 3:15 PM, carrying three crates of organic apples and a small tabby cat named Barnaby. It swerved to avoid a cyclist in a blue jersey who was eating a sandwich near the fountain."
As the story passes through the 5 students, have the rest of the class track what stays and what goes. Usually, the "tabby cat" becomes just a "cat," and the "blue jersey" is lost entirely.
2. Instruction: The Mental Blueprint (15 mins)
Introduce Schema Theory using the slides. Use the "High School Classroom" example. Ask students why they don't have to "learn" what a desk is every time they enter a room—their schema does the work for them.
Critical Point: Schemas save energy but sacrifice accuracy.
3. Activity: War of the Ghosts (20 mins)
Read the War of the Ghosts (Bartlett, 1932) summary. It’s a Native American tale about a man who joins a ghost hunting party.
Ask students to identify Rationalization : British participants in 1932 often changed "hunting seals" to "fishing" or "canoes" to "boats" because those fit their schema better.
Discussion Prompt: "If we change a story to make it make sense to US, are we lying? Or is our brain just trying to be helpful?"
4. Synthesis (10 mins)
Link this back to the "Vanishing Act." While Ebbinghaus showed we lose data, Bartlett shows we replace or reshape data.
Memory Glitch Slides Data Corrupted
THE MEMORY
GLITCH
Case File: Misinformation & False Memories
Lead Investigator: Dr. Elizabeth Loftus
Did You See It?
Think back to the "intruder" who entered our classroom 10 minutes ago.
Did they have a green backpack?
...What if they weren't wearing a backpack at all?
Misinformation Effect
Incorporating misleading information into one's memory of an event after the event has occurred.
Experiment: Car Crash Velocity
Elizabeth Loftus & John Palmer (1974)
Participants watched a video of a car accident and were asked:
"How fast were the cars going when they [verb] each other?"
"Smashed"
"Hit"
"Bumped"
"Contacted"
The Result:
"Smashed" led to higher speed estimates (40.5 mph).
"Hit" led to lower speed estimates (34.0 mph).
One week later, "Smashed" participants were 2x more likely to recall seeing broken glass (even though there was none).
The Power of Suggestion
Leading Questions
Questions that imply a specific answer can alter how we retrieve a memory.
Social Pressure
Hearing others describe an event differently can cause us to "fix" our own memories.
Visual Imagery
Repeatedly imagining an event can eventually make it feel like a real memory.
Tampering with Evidence
"If our memories can be rewritten by a single word... what does that mean for the justice system?"
Debrief Impending
Implanted Memory Worksheet Witness Statement #LOFTUS-74
VERSION 1.0 - POST-MISINFO
The Memory Glitch Log
Analysis of Post-Event Misinformation Influence
WITNESS NAME: ____________________________________ STATION: _________________
Phase 1: Initial Recall
Write down everything you remember about the individual who entered the room earlier. Focus on physical traits , clothing , and actions . Do not speak to your neighbors.
Phase 2: Questioning
Answer the following questions based on your memory. If you did not see an item, write "N/A."
1. What color was the strap on the intruder's backpack?
Response: __________________________________________________
2. Approximately how many seconds did they stand near the window?
Response: __________________________________________________
3. What was the specific brand logo on their blue shirt?
Response: __________________________________________________
The Investigator's Reveal
Wait for the teacher to reveal the actual details of the event.
My Memory Glitches:
Actual Truth:
Scientific Debrief
1. The "Yielding" Phenomenon: Why do people often answer a leading question (like #1 or #3 above) even if they never saw the item in the first place?
2. Loftus Car Crash Connection: Explain how the use of the word "smashed" vs. "hit" in the car crash experiment acted as a "Memory Glitch." What specific part of the participants' memory changed?
Ethical Forensic Challenge
Elizabeth Loftus once said, "Just because a memory is described in great detail and with a lot of emotion doesn't mean it's true."
Based on today's simulation, should eyewitness testimony be the primary evidence used to convict someone of a crime? Justify your stance using the Misinformation Effect.
Loftus Experiment Teacher Guide Teacher Investigation Protocol
Lesson 3: The Memory Glitch
Security Clearance
LEVEL 3
Mission Objectives
Demonstrate the Misinformation Effect through a staged classroom intrusion.
Analyze how leading questions implant false data into eyewitness recall.
Apply Loftus and Palmer’s (1974) findings to the reliability of car accident reports.
Required Assets
One "Intruder" (a colleague or student from another class)
Memory Glitch Slides
Implanted Memory Worksheet
1. The Hook: Staged Intrusion (10 mins)
Setup: Arrange for an "intruder" to enter the room 5 minutes after class begins. They should perform a specific set of actions (e.g., walk to your desk, pick up a stapler, look at it, put it back, check the window, and leave).
Crucial: The intruder should NOT be wearing a backpack and should wear a shirt of a neutral color (e.g., grey or black).
After they leave, continue teaching for 5 minutes. Then, hand out the worksheet and tell them to complete Phase 1 silently.
2. Phase 2: Leading Questions (15 mins)
Instruct students to answer the three questions in Phase 2.
Q1 (Backpack): Misleading. Implies they HAD a backpack.Q3 (Blue Shirt): Misleading. Implies the shirt was blue (when it was grey/black).
Watch for students "yielding"—writing down colors for the backpack strap even though there was no backpack.
3. Instruction: Loftus & Palmer (15 mins)
Use the Memory Glitch Slides to explain the car crash experiment. Emphasize that "smashed" changed the mental representation of the memory to include broken glass.
4. Ethical Debrief (10 mins)
Reveal the truth of the intrusion. Ask students who "hallucinated" a blue shirt or a backpack strap how they feel.
// KEY TAKEAWAY: Confidence != Accuracy. Many students will be 100% sure they saw the blue shirt.
Teacher Ethics Note:
Always ensure the "intruder" is someone known to you and that the actions are non-threatening. Avoid staging "crimes" as this can cause genuine distress. The goal is a neutral observation task.
Faulty Eyewitnesses Slides FAULTY
EYEWITNESSES
The High Stakes of Memory Reliability
Unit IV:
Memory in the Justice System
The Impact: The Innocence Project
69%
Of Overturned Convictions
Involved at least one mistaken eyewitness identification.
Cross-Racial Bias
People are significantly less accurate at identifying individuals of a different race than their own.
Confidence != Accuracy
Juries find confident witnesses persuasive, even though research shows confidence does not correlate with truth.
The "Relative Judgment" Error
In a simultaneous lineup (all 6 photos at once), witnesses often pick the person who looks most like the perpetrator compared to the others, rather than comparing each photo to their memory.
The Solution: Sequential Lineups
Showing photos one at a time forces an absolute judgment (Yes/No) for each individual.
Wrongfully Convicted
Photo: Ronald Cotton served 10.5 years for a crime he didn't commit.
Jennifer Thompson
"I was 100% sure. I would have bet my life on it."
Jennifer was the victim of a brutal assault. She spent years trying to memorize the attacker's face. DNA later proved she had identified the wrong man.
Psychological Takeaway:
Reinforcement from police (e.g., "Good, you picked the guy we thought it was") can inflate witness confidence and solidify a false memory.
Case File Review
You are now the Post-Conviction Investigators. Open your files and find the glitches in the original testimony.
Begin Review
Exoneration File Worksheet Exoneration Audit
Case File: Innocence Project Investigation #404-COTTON
LEGAL ANALYST: ____________________________________ FILING DATE: ______________
Exhibit A: Original Identification Transcript
Detective: "Look at these six photos. Take your time. Is the man who attacked you in this group?"
Witness: "I... I think it might be #4. Or maybe #5. They both look similar."
Detective: "You have to be sure. Look closer at #5."
Witness: "Yes. It's #5. I'm positive now."
Task: Identify the "Procedural Error" in the transcript above. How did the Detective influence the witness's choice?
Exhibit B: Post-Identification Feedback
Research shows that when a witness picks a suspect and the officer says "Good job, you picked the primary suspect," the witness's confidence jumps from 50% to 100%. Explain why this is dangerous for a jury to hear 2 years later during a trial.
Systemic Reforms Audit
Reform Suggestion: Double-Blind Lineups
In a double-blind lineup, neither the witness nor the officer administering the test knows who the suspect is.
How would this reform prevent the "Memory Glitches" we studied in Lesson 3 (Misinformation)?
Case Synthesis: The Cross-Racial Effect
Witnesses often describe a perpetrator of another race as "having very generic features" or "looking like everyone else." Based on Schema Theory (Lesson 2) , why do we struggle to identify faces outside of our own racial group?
Recommendation
The Jury Instruction Challenge
Some states now require judges to read a "Memory Instruction" to juries, warning them that memory is reconstructive and eyewitnesses can be mistaken.
Draft a one-paragraph "Warning Label" that you believe should be read to every jury before they hear from an eyewitness.
Legal Impact Teacher Guide Legal Briefing Guide
Lesson 4: Faulty Eyewitnesses
Case Folder
INNOCENCE
Objectives
Evaluate the statistics of wrongful convictions via The Innocence Project.
Identify specific cognitive biases (Cross-Racial, Confidence Inflation) in legal contexts.
Propose and defend procedural reforms for police lineups.
Materials
Ronald Cotton Video (YouTube)
Faulty Eyewitnesses Slides
Exoneration File Worksheet
1. The Hook: The Cotton Case (15 mins)
Show a clip of Jennifer Thompson and Ronald Cotton (available on YouTube from 60 Minutes or PBS).
Key Discussion Point: Jennifer was 100% confident. Ronald was 100% innocent. Ask: "If Jennifer wasn't lying, how did her brain create such a vivid false memory?"
2. Instruction: Lineups & Bias (20 mins)
Use the Faulty Eyewitnesses Slides . Focus on:
Simultaneous vs. Sequential: Explain that "Relative Judgment" is why simultaneous lineups fail.The Cross-Racial Identification Effect: Discuss "Own-Race Bias" and how it contributes to errors.Officer Reinforcement: How "Good, you got him" seals the memory in place (Confidence Inflation).
3. Activity: Exoneration Audit (20 mins)
Students work through the worksheet. For Part 1, the "Procedural Error" is the detective's suggestion to "Look closer at #5." This is a leading directive that signals to the witness which person they "should" pick.
4. Synthesis: The Jury Charge (5 mins)
Have students share their "Jury Warning Labels."Sample: "Members of the jury, research shows that a witness's confidence can be influenced by police feedback. You should weigh a witness's memory not by how sure they seem, but by the circumstances under which they first identified the suspect."
Hidden Bias Slides THE HIDDEN
BIAS
Closing the Case on Memory Failure
Final Briefing:
Source Amnesia & Hindsight Bias
Who Said That?
Source Amnesia
The inability to remember where, when, or how previously learned information has been acquired, while retaining the factual knowledge.
"I know this is true, but I can't remember if I read it in a textbook or a TikTok comment."
The Danger:
We tend to believe information more as it becomes "familiar," regardless of the credibility of the source.
Movie Memory:
Many people "remember" historical events based on Hollywood movies rather than history books.
"I Knew It All Along!"
Hindsight Bias
The tendency to believe, after learning an outcome, that one would have foreseen it.
A
A witness hears the suspect was caught with the stolen goods.
B
"I knew it was him! I could tell by the way he was acting in the lineup."
How to Protect the Record
Minimizing Contamination in Investigations
Immediate Statements
Take statements before any news reports or social media posts can influence the witness.
Blind Administration
The officer should not know the suspect to avoid unintentional leading cues.
No Feedback
Officers must stay neutral after an ID to prevent confidence inflation.
Confidence Log
Ask the witness "How sure are you?" immediately after the ID, before they have time to rethink.
CASE CLOSED
"Memory is not a museum. It is a workspace."
Prepare for the Final Seminar
Investigative Protocol Worksheet Unit Synthesis Protocol
Subject: Source Misattribution & Investigative Reform
LEAD INVESTIGATOR: ____________________________________ DATE: ______________
1
Phase 1: The Fact Trace (Source Amnesia)
Consider three things you "know" to be true (facts about history, science, or a celebrity). Now, try to trace the Source. Was it a teacher? A book? A social media post? A fictional movie?
Fact #1
Original Source: ____________________________________
Fact #2
Original Source: ____________________________________
Critical Inquiry: Why is it easier for the brain to store a fact than to store the origin of that fact?
2
Phase 2: Hindsight Bias Audit
Recall a recent sports game, election, or test result. Did you find yourself saying "I knew that was going to happen" after the result was revealed?
How does Hindsight Bias make us overconfident in our own predictive abilities?
Investigative Reform Protocol
Based on the five lessons of this unit, develop a set of 3 mandatory guidelines for detectives to use when interviewing witnesses to minimize memory contamination.
1
Guideline: __________________________________________________
Rationale (Connect to a Memory Concept):
2
Guideline: __________________________________________________
Rationale (Connect to a Memory Concept):
3
Guideline: __________________________________________________
Rationale (Connect to a Memory Concept):
Seminar Synthesis Question
"If we know that memory is reconstructive, prone to interference, and easily glitched by misinformation, can any single memory ever be used as 'proof' in a court of law?"
Record your initial argument below to prepare for our final seminar.
Hidden Bias Teacher Guide Seminar Facilitation Guide
Lesson 5: The Hidden Bias
Case Status
CLOSED
Seminar Goals
Define Source Amnesia and Hindsight Bias with personal examples.
Synthesize knowledge from the entire unit to create investigative reform policies.
Engage in a Socratic Seminar regarding the ethical use of eyewitness testimony.
Final Assessment
Deliverables:
Completed Protocol Worksheet
Seminar Participation
3 Investigative Guidelines
1. Activity: The Fact Trace (15 mins)
Challenge students to find the source of a common "fact" (e.g., "We only use 10% of our brains").
Teacher Tip: Most students won't be able to recall the source. This is Source Amnesia . Explain that this is how "Fake News" or rumors spread—we remember the content, not the unreliable origin.
2. Instruction: Hindsight Bias (15 mins)
Discuss how "knowing" an outcome rewrites our memory of our original predictions.
Connection: How does Hindsight Bias make a jury treat an eyewitness identification more seriously if they already know the person was "caught"?
3. Socratic Seminar: The Final Verdict (25 mins)
Arrange the room in a circle. Use the Synthesis Question from the worksheet as the starting point.
Prompt A:
"If memory is so fallible, should we throw out eyewitness testimony entirely?"
Prompt B:
"Which reform from this unit (sequential lineups, double-blind, jury warnings) is most essential?"
Seminar Grading Rubric
Evidence (40%)
References at least 2 specific concepts (e.g. Loftus, Bartlett, Ebbinghaus).
Synthesis (30%)
Links memory mechanics to legal or real-world consequences.
Discourse (30%)
Respectfully builds on or challenges a peer's argument.
