With the help of inhibition theory it is possible to define the concept of intelligence operationally. Intelligence is then the ratio of the rate of inhibition increase during periods of attention and the rate of inhibition decrease during periods of distraction or, better,  the natural logarithm of this ratio, i.e. The natural logarithm is normally distributed  .
With the help of inhibition theory it is possible to define the concept of intelligence operationally. Intelligence is then the ratio of the rate of inhibition increase during periods of attention and the rate of inhibition decrease during periods of distraction or, better, minus the natural logarithm of this ratio, i.e. Minus the natural logarithm is normally distributed . The reason why the minus sign is used is that a high score also corresponds to a high intelligence and a low score to a low intelligence. .
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. The reason why the minus sign is used is that a high score also corresponds to a high intelligence and a low score to a low intelligence.