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Mental age
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Mental age is a controversial concept in psychometrics. It is an intelligence test score, expressed as the chronological age for which a given level of performance is average or typical.
r taking a standardized test, an individual's mental age is divided by his chronological age and multiplied by 100, yielding an intelligence quotient (IQ). Thus, a subject whose mental and chronological ages are identical has an IQ of 100, or average intelligence.
Mental age in video games In the Nintendo DS video game Brain Age, the player completes different activities using the DS's features, like the microphone, to find their mental age, from 20-80.

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Encyclopedia
Mental age is a controversial concept in psychometrics. It is an intelligence test score, expressed as the chronological age for which a given level of performance is average or typical.
How mental age is used to derive an IQ score
After taking a standardized test, an individual's mental age is divided by his chronological age and multiplied by 100, yielding an intelligence quotient (IQ). Thus, a subject whose mental and chronological ages are identical has an IQ of 100, or average intelligence.
Mental age in video games In the Nintendo DS video game Brain Age, the player completes different activities using the DS's features, like the microphone, to find their mental age, from 20-80. The Brain Challenge game also features mental age calculation.
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