Proactive Interference
What you already knew intrudes on what you're trying to learn.
Evidence: well established. We label every concept honestly, and say so when it's a teaching model. How we rate evidence.
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
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 memory phenomenon studied for over a century, with strong experimental support.
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