Oddly Wired
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memory

Your mood determines what you can remember.

Information is sometimes encoded and retrieved more effectively when the internal emotional state matches between encoding and retrieval, a concept known as mood-dependent memory, though this effect is inconsistent and often difficult to replicate.

The effect is not a guaranteed cognitive mechanism but a phenomenon whose replicability has been frequently challenged in psychological literature.

Your brain uses your mood as a filing system.

Where this comes from

Study
Bower (1981)
What the check found
While Bower (1981) is the correct citation for this theory, the effect is often inconsistent and difficult to replicate in lab settings, making the claim of effective encoding/retrieval an overstatement.
Confidence
Solid, with limits

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.