Watch for
Memories becoming more vivid or detailed after discussing an event with others.
Memory & AttentionBias #64
Misinformation Effect
Post-event information can distort our memory.
The distortion of memory caused by exposure to misleading post-event information or leading questions causing people to incorporate false details into their recollection.
Why it matters: Famously demonstrated by Elizabeth Loftus. Has major implications for eyewitness testimony.
Try this
Avoid leading questions and record your recollection before discussing an event with others.
Real-world example
A witness hears a leading question like "How fast was the car going when it smashed into the other car?" and later remembers the impact as more severe than it was.
Key researchers
Elizabeth Loftus
First described in 1974
Psychological mechanism
Memory updating and source confusion. The brain does not store memories as fixed files. Each retrieval is a reconstruction. Post-event information can blend with the original memory trace making it impossible to distinguish the two.
Seminal research
Elizabeth F. Loftus and John C. Palmer (1974), "Reconstruction of automobile destruction: An example of the interaction between language and memory."
Related Biases
Below is a realistic scenario. Read it, then choose what you would do. The feedback will show whether a cognitive bias influenced your choice — not to judge, but to reveal the pattern in action.
Thought Experiment
This experiment places you in a realistic decision. Your instinctive choice will reveal whether bias is at work.
STEP 1 → ReadSTEP 2 → ChooseSTEP 3 → Reveal
Debrief
The misinformation effect shows that memory is not a recording — it is reconstructed each time. Post-event information can seamlessly blend into the original trace. This is why eyewitness testimony is far less reliable than people assume.