Retroactive Interference

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

Evidence summary

A well-established and heavily replicated finding in memory research.