Mental Age and IQ
Originally, the differences between mental age and chronological age were used to compute the intelligence quotient, or IQ. This was computed using the ratio method, with the following formula: mental age/chronological age * 100 = IQ. No matter what the child's chronological age, if the mental age is the same as the chronological age, then the IQ will equal 100.
An IQ of 100 thus indicates a child of average intellectual development. For a gifted child, the mental age is above the chronological age, and the IQ is higher than 140; for an intellectually challenged child, the mental age is below the chronological age, and the IQ is below 70.
Read more about this topic: Mental Age
Famous quotes containing the words mental and/or age:
“It is a world completely rotten with wealth, power, senility, indifference, puritanism and mental hygiene, poverty and waste, technological futility and aimless violence, and yet I cannot help but feel it has about it something of the dawning of the universe.”
—Jean Baudrillard (b. 1929)
“Old age is always wakeful; as if, the longer linked with life, the less man has to do with aught that looks like death.”
—Herman Melville (1819–1891)