The term for solving a problem by suddenly grasping the solution is insight.
In psychology, insight describes the sudden appearance of a solution after a person has struggled, reached an impasse, or tried unsuccessful approaches. It is often called an “Aha!” moment. Rather than following a visible chain of small logical steps, the solver experiences a rapid reorganization of the problem and recognizes a workable answer.
The concept became especially important in Gestalt psychology during the early twentieth century. German psychologist Wolfgang Köhler studied chimpanzees in Tenerife and reported that they could suddenly combine objects in new ways, such as stacking boxes or using sticks to reach food. In his 1917 book The Mentality of Apes, Köhler argued that some animal problem-solving could not be explained solely as trial-and-error learning.
Insight is not the same as habituation, imprinting, or sensitization. Those terms describe forms of learning or changes in responsiveness, not a sudden restructuring of a difficult problem. Famous human insight tasks include the nine-dot problem, the Duncker candle problem, and word-association puzzles. Research suggests that incubation, sleep, and a change in perspective can sometimes help produce an insight.