>[!abstract] >The Baader-Meinhof phenomenon, or frequency illusion, is the tendency for the brain to become more attentive and aware of something after seeing it recently, as a result of selective attention (the brain no longer filters out information it has been recently presented with). >[!related] >- **North** (upstream): — >- **West** (similar): — >- **East** (different): — >- **South** (downstream): —