Step 1: Recall the definition of retroactive interference.
Retroactive interference occurs when newly learned information interferes with the recall of previously learned information.
Step 2: Apply to the given situation.
Here, learning something new impairs the ability to retrieve older information. This matches exactly with retroactive interference.
Step 3: Eliminate other options.
- Proactive interference is the reverse: older information interferes with new learning.
- Tip-of-the-tongue phenomenon is a retrieval failure, not interference.
- Recency effect refers to remembering the most recent items better.
Thus, the correct answer is retroactive interference.