Eyewitness memory feels reliable but is surprisingly error-prone: post-event information can overwrite original memories, confidence does not track accuracy, and even vivid "flashbulb" memories of shocking events degrade over time while confidence stays high. The same constructive and reconstructive processes from Part 1 explain false and recovered memories, the misinformation effect, and source-monitoring failures.
Difficulty: Intermediate | Prerequisites: Part 1 (Constructive Memory, Schemas, and Scripts)
This is the applied half of the everyday memory topic. It takes the constructive/reconstructive framework and schemas from Part 1 and shows what happens when those mechanisms operate in high-stakes situations: courtroom testimony, memories of national tragedies, and therapeutic recovery of childhood events. The recurring finding is that memory errors are far more common than people realise, even for emotionally significant events. You should already understand constructive vs. reconstructive memory and how schemas shape recall.
Eyewitness memory
A witness's recall of the details of an observed event, especially a crime. Extremely influential in obtaining convictions, yet research shows it is often inaccurate.
Loftus Eyewitness Memory Paradigm
An experimental method in which participants (1) view an event, (2) are given misleading information during questioning, and (3) are tested on the original event. Demonstrates how post-event suggestion distorts recall.
Source memory / source monitoring
Your ability to remember how you encountered a piece of information: did you experience it, read it, hear about it, or imagine it? Source-monitoring failures are at the heart of many memory distortions. The concept was developed by Marcia Johnson.
Flashbulb memory
A vivid, confident memory of the circumstances in which you learned about a shocking or emotionally significant event (e.g. "Where were you on 9/11?"). First described by Brown & Kulik (1977). Despite their vividness, flashbulb memories are often inaccurate.
Misinformation effect
The tendency for post-event information to interfere with the original memory of an event. Think of it as your memory getting contaminated by what you hear or read after the fact.
Repression
A theoretical mechanism by which a traumatic memory is "forgotten" because its access is blocked, not because the trace is lost. A form of retrieval failure. Controversial, especially in the context of recovered memories.
False memory
A memory of an event that did not happen, or a substantially distorted memory of one that did. Produced by the same constructive and reconstructive processes that operate in normal memory.
Guided imagery
Repeated questioning and imaginative rehearsal about an event, often used in therapy. Can contribute to the creation of false memories by providing source-monitoring confusion between imagined and experienced events.
Intrusive recollection
A hallmark symptom of PTSD in which the traumatic event forces its way back into consciousness through flashbacks, nightmares, or triggered emotional responses. Contrasts with the idea of repression.
Reminiscence bump
The observation that people's autobiographical memories are disproportionately rich for events from their late teens and early twenties. Think of it as a "peak memory window" for life events.
Overdetermined (errors)
When a real-world memory error has multiple contributing causes (attentional cueing, top-down perception, reconstruction) rather than a single explanation.
Why eyewitness memory matters
Eyewitness testimony is extremely influential in obtaining a conviction.
A witness's certainty is important to jurors.
Unfortunately, certainty is not strongly related to accuracy. Eyewitness memory has been completely wrong in a number of cases (the true number is unknown).
The errors can be explained by the same factors that cause forgetting in laboratory settings.
The Loftus Eyewitness Memory Paradigm
Three steps:
Participants view an event (e.g. a car accident on video).
They are given misleading information during questioning (e.g. "How fast were the cars going when they smashed into each other?" vs. "...when they hit each other?").
Memory is tested for the original event, including post-event suggestions.
The key finding is that misleading post-event information becomes incorporated into the memory of the original event. This is the misinformation effect.
Source memory (Marcia Johnson)
Source memory is your record of how you encountered a piece of information. Did you experience it directly? Read it? Hear someone tell you? Imagine it? When source monitoring fails, you may "remember" something you only imagined, or attribute a detail from one context to another.
In SAM (Search of Associative Memory) terms, each memory is linked both to its content and to its context (the source). When you retell an event and introduce an error, you now have two competing memory traces: Event 2 from the original experience and Event 2b from your retelling. These compete at recall, and the retelling version can win.
Real-world case: the DC sniper attacks (October 2002)
During a series of random shootings in the Washington, DC area that killed 10 people and injured 3 over nearly three weeks, one witness reported seeing a white van or box truck near a shooting scene. That single report infiltrated other witnesses' memories: soon multiple people were "remembering" a white van, even though the actual vehicle was a dark sedan.
Why so many white vans?
Attentional cueing: after the first report, people started looking for white vans and paying less attention to dark sedans.
Top-down perception: expectations shaped what people thought they saw.
Memory biases and reconstruction: "Yeah, now that you mention it, there was a van of some kind there..."
These real-world errors are often overdetermined, meaning they have multiple contributing causes rather than a single explanation.
The concept (Brown & Kulik, 1977)
A flashbulb memory is a memory for the circumstances in which you experienced or heard about a shocking event ("Where were you when you heard that President Kennedy was assassinated?"). People could provide detailed accounts 10 years later, and early researchers assumed these memories were accurate. The idea was that emotion somehow fixes the circumstances permanently.
Neisser & Harsch (1992): challenging accuracy
This study tested whether flashbulb memories are as accurate as they feel.
Gave a questionnaire the day after the Challenger explosion (1986).
Repeated the same questionnaire 32 months later.
Recall score (out of 7): mean of 2.9.
Of 220 facts originally reported, 93 were completely wrong and 60 were partly wrong at the second testing.
Confidence was high (4.2 out of 5), even among participants whose recall was very poor.
Correlation between confidence and accuracy: r = .29 (weak).
A clear example of high confidence not indicating accuracy.
Phelps et al. (2015): 9/11 flashbulb memories over a decade
Four surveys: 1 to 2 weeks after the attack, 1 year later, 3 years later, 10 years later.
Measured consistency with the first report.
After one year, consistency dropped to about 65%, but confidence remained at roughly 4.5 out of 5.
Confidence stayed disproportionately high relative to what was actually remembered, though it did decline somewhat.
Errors introduced by the one-year survey tended to persist: only about 27% were corrected later. Errors that survived from Survey 2 into Survey 3 were very likely to be retained in Survey 4.
"Between the time of the attack and the first year, people appeared to have formed a memory of the circumstances in which they learned of the event, and this memory became their story, regardless of any errors it might include."
Many errors were confusions of different "time slices," similar to source memory errors and list interference.
The conclusion: flashbulb memories are not much of a photograph. They feel vivid and certain, but they degrade like other memories while confidence remains inflated.
Rimmels study: emotion inflates confidence, not accuracy
Participants saw emotional pictures (car accident) and neutral pictures (car), each framed in red or green. Later, they were asked which picture they remembered and what colour the frame was.
Memory for the frame colour was worse for emotional pictures.
But confidence was higher for emotional pictures.
This neatly demonstrates the dissociation between emotion, confidence, and accuracy that runs through the flashbulb memory literature.
False or recovered memories
People sometimes claim to have no memory of a childhood event (usually traumatic) and then, through therapy or some other intervention, recall it.
The central question is whether such recovered memories are accurate. This is distinct from never-forgotten cases of childhood abuse (which are the vast majority).
Possible explanation via repression
The memory was "forgotten" through repression: the trace is still there, but access to it is blocked (a form of retrieval failure).
However, in most cases of traumatic events the problem is the opposite: intrusive recollection, not forgetting. People cannot get the event out of their minds.
Post-traumatic Stress Disorder (PTSD)
The "B" criterion of PTSD (intrusive recollection) is one of its most distinctive features. The traumatic event remains a dominating psychological experience that can evoke panic, terror, dread, grief, or despair for decades. These intrusions manifest as daytime fantasies, traumatic nightmares, and flashbacks. This contrasts directly with the repression account.
Possible explanation via false memory
Many causes of memory error are known from experimental work:
Memory interference: real events are followed by questions, imaginings, and discussion of possible other events. The imagined events are similar enough to actual events that interference occurs. This is fundamentally a problem of source memory.
We have a ready schema for child abuse that can drive memory reconstruction.
Lying is not the issue. False memories reflect a genuine inability to represent reality accurately, not intentional fabrication.
The basic debate
Therapists argue that their clinical experience provides good evidence for repressed abuse.
Memory researchers argue that their experiments provide good evidence for memory errors.
But: therapists cannot independently verify that recovered memories are true, and memory researchers struggle to generalise from lab experiments with harmless materials to cases of actual traumatic abuse.
Questioning techniques that increase errors in children (Bruck & Ceci, 1997)
Seeking confirmatory information only, ignoring disconfirmatory evidence.
Asking specific or true/false questions instead of open-ended ones ("What happened?").
Creating an atmosphere of accusation ("You'll feel better if you tell me what happened").
Using guided imagery: repeated questioning and imagining of the event.
Children are more susceptible because they do not have well-developed schemas to resist suggestion.
Thomas & Loftus (2002): imagination inflation
Session 1: participants either performed or imagined actions, which were either familiar (look through a magnifying glass, roll the dice) or bizarre (kiss the magnifying glass, sit on the dice).
Session 2: participants imagined the actions 0, 1, or 5 additional times.
Two weeks later, asked whether they had performed the actions in Session 1.
Results: imagining actions in Session 2 increased false memories of having performed them, from a baseline of 4% up to 24% (familiar actions) or 14% (bizarre actions).
Even bizarre actions generated false memories.
Results were nearly identical for actions that were only imagined in Session 1, meaning imagining something made people believe they had done it.
Imagining also increased false alarms on recognition tests: although it slightly improved correct recognition, it greatly increased false recognition of events that never happened.
Limitations to keep in mind
These studies did not involve traumatic or strongly emotional events.
Participants were college students in controlled experiments.
Consistent finding across this entire topic: memory errors are much more common than people realise, even for important or salient events.
The reminiscence bump is the observation that people's autobiographical memories are richest for events from their late teens and early twenties.
Cognitive hypothesis: a period of significant change (leaving home, starting university, forming adult relationships), followed by a period of relative stability, may lead to stronger encoding. The change itself creates distinctive, well-encoded memories, and the subsequent stability reduces interference. This is similar to the role of sleep in memory consolidation.
Supporting evidence: people who emigrate later in life show a bump in memory around the time of emigration, not around their twenties. Change matters more than age.
"Confident witnesses are accurate witnesses." Confidence and accuracy are only weakly correlated (r = .29 in Neisser & Harsch). A witness can be completely wrong and completely certain at the same time.
"Flashbulb memories are like photographs." They feel that way, but they degrade over time like other memories. The emotional intensity inflates confidence without protecting accuracy.
"Recovered memories must be true because they are so vivid and emotional." Vividness and emotion are features of false memories as well. Thomas & Loftus showed that simply imagining an action can make you believe you performed it.
"Children are more reliable witnesses because they are more honest." Children are more susceptible to leading questions and guided imagery precisely because they lack the well-developed schemas that help adults resist suggestion.
⚠️ The Loftus paradigm (view event, misleading info, test) is a staple exam question. Know the three steps and what they demonstrate.
⚠️ Source memory is a recurring explanation across multiple topics: misinformation, flashbulb errors, false memories. Be able to define it and apply it.
⚠️ Neisser & Harsch (1992) is the go-to study for showing that flashbulb memories are inaccurate. Know the Challenger study, the recall score (2.9 out of 7), and the confidence-accuracy dissociation (r = .29).
⚠️ Phelps et al. (2015) extends this to 9/11 memories over a decade. The key numbers: 65% consistency at one year, only 27% of errors corrected, and errors that persist across surveys tend to become permanent.
⚠️ Thomas & Loftus (2002) is the key study for imagination inflation. False memories of familiar actions jumped from 4% to 24% with repeated imagining.
⚠️ The false/recovered memory debate is frequently tested as a short-answer or essay question. Be ready to present both sides and identify the limitations of each position.
⚠️ The reminiscence bump and the cognitive hypothesis (change followed by stability) are commonly tested in multiple-choice format.
True or false: A witness's confidence in their memory is a strong predictor of accuracy. Answer: False. Confidence and accuracy are only weakly correlated.
Fill in the blank: The ______ effect is the tendency for post-event information to distort memory for the original event. Answer: misinformation.
In the Neisser & Harsch (1992) Challenger study, what was the mean recall score out of 7? Answer: 2.9.
True or false: In Thomas & Loftus (2002), imagining bizarre actions did not produce false memories. Answer: False. Even bizarre actions generated false memories (from 4% to 14%).
What is the reminiscence bump? Answer: The observation that autobiographical memories are disproportionately rich for events from the late teens and early twenties.
Q: Describe the Loftus Eyewitness Memory Paradigm and explain what it demonstrates about memory.
A: Participants view an event, are then given misleading information during questioning, and are finally tested on their memory of the original event. The paradigm demonstrates the misinformation effect: post-event suggestions become incorporated into the original memory trace, leading participants to report details that were never present. This occurs because of source-monitoring failures, where participants cannot distinguish between what they actually saw and what they were told afterwards.
Q: What did Neisser & Harsch (1992) find about flashbulb memories for the Challenger explosion?
A: Participants filled out a questionnaire the day after the explosion and again 32 months later. Recall was poor (mean score 2.9 out of 7), with 93 of 220 facts completely wrong and 60 partly wrong. Despite this, confidence was high (4.2 out of 5), and the correlation between confidence and accuracy was weak (r = .29). The study showed that flashbulb memories degrade substantially while subjective confidence remains inflated.
Q: In Phelps et al. (2015), what happened to errors in 9/11 flashbulb memories over time?
A: Errors introduced by the one-year survey were sticky: only about 27% were later corrected. Errors that persisted from Survey 2 into Survey 3 were very likely to be retained in Survey 4 (ten years later). People appeared to form a narrative of how they learned about the attack within the first year, and that narrative, errors included, became their permanent story.
Q: How does the Thomas & Loftus (2002) study demonstrate the imagination inflation effect?
A: Participants who imagined performing actions (0, 1, or 5 times in Session 2) were later more likely to falsely believe they had actually performed those actions in Session 1. False memories jumped from a 4% baseline to 24% for familiar actions and 14% for bizarre actions. This shows that the act of imagining can create a memory trace that is later confused with a trace of genuine experience, a source-monitoring failure.
Q: Explain both sides of the false/recovered memory debate and identify one limitation of each position.
A: Therapists argue that their clinical experience provides evidence for memories repressed after traumatic abuse. Memory researchers argue that experimental evidence shows how easily false memories can be created through suggestion, guided imagery, and schema-driven reconstruction. A limitation of the therapist position is that recovered memories cannot be independently verified as true. A limitation of the research position is that lab experiments use harmless materials with college students, making it difficult to generalise to real cases of severe childhood trauma.
This material builds directly on Part 1's concepts of constructive/reconstructive memory and schemas. Source memory ties back to encoding specificity and context-dependent retrieval from earlier in the course. The false memory debate connects to broader questions in clinical psychology about the reliability of therapeutic techniques. PTSD and intrusive recollection link to the neuroscience of emotional memory (amygdala involvement in memory consolidation). The reminiscence bump connects to the self-reference effect and identity formation in developmental psychology.
Eyewitness memory, eyewitness testimony, Loftus misinformation paradigm, misinformation effect, post-event suggestion, source memory, source monitoring, Marcia Johnson, flashbulb memory, Brown and Kulik 1977, Neisser and Harsch 1992, Challenger explosion memory, Phelps et al 2015, 9/11 memory, confidence-accuracy dissociation, false memory, recovered memory, repression, PTSD, intrusive recollection, guided imagery, imagination inflation, Thomas and Loftus 2002, Bruck and Ceci 1997, children's memory, suggestibility, reminiscence bump, cognitive hypothesis, DC sniper white van, overdetermined errors, Rimmels study, PSY 310, cognitive psychology, memory distortion