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That agonizing moment when you know precisely what you want to say but you fail to produce the word or phrase is known as a "tip-of-the-tongue" moment. Lise Abrams, a psychology professor at the University of Florida has studied the phenomenon for 20 years. Researchers have even found occurrences among sign language users--termed "tip-of-the-finger" states. Key findings: 1. Low-frequency use: We're more likely to draw blanks on words we use less frequently - like abacus or palindrome. 2. There are also categories of words that lead to tip-of-the-tongue states more often. Proper names are one of those categories. There's no definitive theory, but one reason might be that proper names are arbitrary links to the people they represent, so people with the same name don't possess the same semantic information the way that common nouns do, Abrams said.