Retroactive Interference
Recent information crowds out what you learned before.
Evidence: well established. We label every concept honestly, and say so when it's a teaching model. How we rate evidence.
Shrink Definition
Retroactive interference is when new learning disrupts memory for older material, so recent information overwrites what came before. Learning a new phone number can make the old one harder to recall. Like its partner proactive interference, it's strongest when old and new material are similar. It's one reason memories fade even when they were once solid.
Plain language
New learning interferes with remembering older, similar information.
Shrink Insight
The new can overwrite the old in memory, not just add to it.
Why it matters
It explains why recent learning can blur older memories and informs how to protect important knowledge. It pairs with proactive interference to show memory as a competition.
Common misunderstanding
People assume new learning simply adds to what they know. New, similar material can actively disrupt retrieval of older memories.
Shrink Perspective
Memory is a competition, and the newcomer can win.
Shrink Reflection
What older knowledge got fuzzy after I learned a newer version?
Shrink Step
To protect key older knowledge, revisit it after learning new, similar material.
Shrink Minute
Recall an old fact that got fuzzy after you learned a newer version.
Shrink Takeaway
New learning can overwrite the old.
Medical boundary
This concept is educational and shouldn't be used to self-diagnose. It doesn't replace care from a licensed clinician. Symptoms, medication, and treatment decisions should be discussed with a qualified professional, and emergency symptoms require emergency care.
Evidence summary
A well-established and heavily replicated finding in memory research.
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