Eureka effect
（重定向自Aha experience）
![A 16th century woodcut of Archimedes' eureka moment](/Images/godic/202412/14/Archimedes_bath3748.jpg")
![The Nine Dot Problem with solution. Most individuals fail to draw lines beyond the dots that compose the square, and are unable to solve this puzzle.](/Images/godic/202412/14/Ninedots.svg3749.png")
![Two examples of Matchstick Arithmetic Problems.](/Images/godic/202412/14/Matchstickarithmetic3749.jpg")
The eureka effect (also known as the aha! moment or eureka moment) refers to the common human experience of suddenly understanding a previously incomprehensible problem or concept. Some research describes the aha! effect (also known as insight or epiphany) as a memory advantage, but conflicting results exist as to where exactly it occurs in the brain, and it is difficult to predict under what circumstances one can predict an Aha! moment.