A genius is a person with distinguished mental abilities. This can manifest either as a foremost intellect, or as an outstanding creative talent. The IQ level at which someone may be called a genius is usually defined as 130 or above. The term also applies to one who is a polymath, or someone skilled in many mental areas. The term specifically applies to mental rather than athletic skills, although it is also colloquially used to denote the possession of a superior talent in any field; e.g., Pelé may be said to have a genius for soccer, or Gandhi for statesmanship.
A comparable term from Arabic lore is a djinn, often Anglicized as "genie". Note, however, that this term is a false friend, not a cognate.
For more information on these etymological roots, see Genius (mythology).
Artistic genius may show itself in early childhood (prodigy) or later in life; either way, geniuses eventually differentiate themselves from the rest through great originality. Intellectual geniuses usually have crisp, clear-eyed visions of given situations, in which interpretation is unnecessary—the facts just hit them, and they build or act on the basis of those facts, usually with tremendous energy. Here too, accomplished geniuses in intellectual fields start out in many cases as prodigies, gifted with superior memory, pattern recognition or just understanding.
The classical skill of the musical genius is the capability of holding many different melodies in one's head at once and knowing how they interact together. It is said that the great classical composers (Bach, Mozart, etc) could hold 5, 6 or even 7 different melodies in their minds at once. They could write complicated music with many different parts all at once without having to hear it played. In comparison, the average person can only hold 1 melody in memory.
A theory put forth by Harvard professor Howard Gardner in his 1983 book Frames of Mind states there are seven kinds of intelligences, each with its own type of genius. See theory of multiple intelligences for more on this view.
Intelligence is exceptionally difficult to quantify. The standard measurement in the United States is by the I.Q. test. This is criticized by many as it only measures some aspects (some argue an ethnocentric and academic aspect) of intelligence.
Socio-emotional problems are more prevalent in geniuses with an IQ above 145. Asynchronous development is the primary cause of this. As most children do not share gifted children's interests, vocabulary, or desire to organize activities, the genius child may withdraw from society.
Some research shows that reasons other than maladjustment make companionship difficult to find for geniuses. As intelligence of a person increases, what they consider as their peers constitutes a shrinking number of people. For example, at an IQ of 135 only every hundredth person would be of equal or greater IQ. This number shrinks significantly as IQ goes up.
Leta Hollingworth introduced the idea of an essential "communication limit" based on IQ. According to her theory, to be a good leader of one's contemporaries, he/she must be more intelligent but not too much more intelligent than the people who are being led. This implies that geniuses may not make good leaders of those substantially less gifted and that they could have disdain for authority. The theory also states that children and adults become intellectually ostracized from their contemporaries when an IQ difference of 30 points or more exists. And sometimes even less than 30. *
In the philosophy of Immanuel Kant, genius is the ability to independently arrive at and understand concepts that would normally have to be taught by another person. In the Kant Dictionary (ISBN 0-631-17535-0), Howard Caygill talks of the essential character of "genius" for Kant being originality. This genius is a talent for producing ideas which can be described as non-imitative. Kant's discussion of the characteristics of genius is largely contained within the Critique of Judgement and was well received by the romantics of the early 19th century.
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