Misinformation Effect in AP Psychology

In AP Psychology, the misinformation effect is a memory error in which misleading information you receive after an event (like leading questions or a slightly wrong news story) gets blended into your memory, so you confidently recall details that never happened.

What is the Misinformation Effect?

The misinformation effect happens when information you encounter after an event changes how you remember the event itself. That information is called post-event information. It could be a leading question, a news article that gets one detail wrong, or a chat with another witness. The original memory doesn't just sit untouched next to the new info. The two get blended, and you walk away remembering a version that includes details you never actually saw.

The CED lists the misinformation effect under AP Psych 2.7.A as one reason memory accuracy breaks down, right alongside source amnesia and constructive memory. The big idea is that memory works more like a Wikipedia page than a video recording. Anyone who touches it afterward can edit it. The classic example is Elizabeth Loftus's research. In her study with John Palmer, people who were asked how fast cars were going when they "smashed" into each other gave higher speed estimates than people asked about cars that "hit." A week later, the "smashed" group was also more likely to remember broken glass that was never in the video.

Why the Misinformation Effect matters in AP® Psychology

This term lives in Unit 2: Cognition, inside Topic 2.7 (Forgetting and Other Memory Challenges). It directly supports learning objective AP Psych 2.7.A, which asks you to explain possible reasons why memory failures or errors occur. The essential knowledge names the misinformation effect specifically as something that affects memory accuracy. That's a different problem from forgetting. You're not losing the memory. You're keeping a corrupted copy of it.

It matters beyond the textbook too. The misinformation effect is why eyewitness testimony is shaky evidence and why interviewers try to avoid leading questions. It's also a favorite for research-based questions, since the original studies are clean experiments with a clear independent variable (the post-event information) and dependent variable (memory accuracy). The College Board built the 2025 AAQ around it.

How the Misinformation Effect connects across the course

Constructive Memory and Imagination Inflation (Unit 2)

The misinformation effect only works because memory is constructive. You rebuild a memory each time you recall it instead of replaying a file. Imagination inflation is a close cousin. Picturing something vividly can make you more confident it happened, just like hearing it from someone else can.

Memory Consolidation (Unit 2)

Memories need time to stabilize, and recalling one can make it flexible again. Misinformation slips in during those windows. That's why the timing of an interview, right away versus a week later after news coverage, shows up so often in practice questions.

Retroactive Interference (Unit 2)

Both involve new information messing with old memories, so they feel similar. Retroactive interference makes the old memory harder to retrieve, though. The misinformation effect rewrites the old memory with false details. Think of it as "blocked" versus "edited."

Implanted Memories and Confabulation (Unit 2)

Push the misinformation effect far enough and you get implanted memories, which are entire events that never happened, planted through suggestion. Confabulation is the related habit of filling memory gaps with made-up details you honestly believe are true. All three show that confidence is not proof of accuracy.

Is the Misinformation Effect on the AP® Psychology exam?

Multiple choice: Most stems describe an eyewitness scenario and ask you to name the error. A typical one has a witness interviewed twice, reading news coverage in between, and then confidently describing a detail (like a stop sign) that wasn't there. Others are experiment-based. Groups watch a staged robbery, then one group is questioned immediately and another reads a slightly incorrect article first. You need to predict which group's memory will be least accurate, or identify the independent variable. Watch for distractors like retroactive interference, source amnesia, and encoding failure.

FRQs: The 2025 AAQ Q1 described a study on how varying amounts of misinformation about an event affect memory of that event. On an AAQ like this, you aren't just defining the term. You identify the research design, the variables, and the operational definitions, then explain what the results say about memory. Your answer should make clear that post-event information distorts the original memory itself.

The Misinformation Effect vs Source Amnesia

Source amnesia means you remember the information but forget where you got it. For example, you're sure you read a fact but can't recall if it came from a textbook or a TikTok. In the misinformation effect, the memory content itself becomes wrong because post-event information got mixed in. The two often team up, since you may accept a false detail partly because you forgot it came from a news story and not your own eyes. On the exam, ask yourself whether the problem is a false detail (misinformation effect) or a lost source (source amnesia).

Key things to remember about the Misinformation Effect

• The misinformation effect occurs when misleading information received after an event gets incorporated into your memory of that event.

• The misinformation effect is a memory accuracy problem, not a forgetting problem, because you end up remembering false details instead of losing the memory.

• Leading questions, slightly inaccurate news reports, and conversations with other witnesses are all common sources of post-event information.

• Elizabeth Loftus showed that changing one word in a question, like "smashed" instead of "hit," can change speed estimates and even create memories of broken glass that was never there.

• The misinformation effect falls under AP Psych 2.7.A and appears alongside source amnesia and constructive memory as reasons memories become inaccurate.

• Feeling confident about a memory does not mean it's accurate, which is why the misinformation effect matters so much for eyewitness testimony.

Frequently asked questions about the Misinformation Effect

What is the misinformation effect in AP Psychology?

It's a memory error where information you get after an event, like a leading question or a wrong detail in a news story, gets blended into your memory of the event. It's covered in Topic 2.7 under learning objective AP Psych 2.7.A.

Does the misinformation effect mean the person is lying?

No. People affected by the misinformation effect sincerely believe their memory, and they're often very confident about the false details. That's what makes it so dangerous in eyewitness testimony.

How is the misinformation effect different from retroactive interference?

Retroactive interference means new learning makes an old memory harder to retrieve, like a new phone number blocking your old one. The misinformation effect changes the content of the old memory so you recall false details. One blocks the memory and the other edits it.

Who discovered the misinformation effect?

Psychologist Elizabeth Loftus is the researcher most associated with it. In her study with John Palmer, using the word "smashed" instead of "hit" led people to estimate higher speeds and later falsely remember broken glass at a car crash.

Is the misinformation effect on the AP Psych exam?

Yes. It's named in the essential knowledge for 2.7.A and shows up in eyewitness-style multiple-choice questions. The 2025 AAQ Q1 was built around a study on how different amounts of misinformation affect memory of an event.