Proactive Interference

Shrink Definition

Proactive interference is when older learning gets in the way of new learning, so what you already know intrudes on what you're trying to learn. An old password keeps surfacing when you try to recall the new one. The more similar the old and new material, the stronger the interference. It's a normal feature of how memory competes for retrieval.

Plain language

Old learning interferes with remembering new, similar information.

Shrink Insight

Sometimes the hardest thing to learn is the update to what you knew.

Why it matters

It explains a common source of everyday memory errors and why similar material is confusing. It informs how to space and distinguish new learning.

Common misunderstanding

People think forgetting new information means their memory is failing. Often the old, similar memory is actively interfering with the new one.

Shrink Perspective

The past can crowd the present in memory too.

Shrink Reflection

Where does an old habit or fact keep overriding a new one?

Shrink Step

When new material clashes with old, deliberately mark what makes it different.

Shrink Minute

Recall a time an old habit or fact kept overriding a new one.

Shrink Takeaway

Old learning can jam the new.

Medical boundary

Evidence summary

A well-established memory phenomenon studied for over a century, with strong experimental support.