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:
“Talent is nothing but a prolonged period of attention and a shortened period of mental assimilation.”
—Konstantin Stanislavsky (1863–1938)
“The higher the mountain on which you stand, the less change in the prospect from year to year, from age to age. Above a certain height there is no change.”
—Henry David Thoreau (1817–1862)