The Meaning Of IQ
The abbreviation IQ is derived from the German term Intelligenz-Quotient, initially coined by philosopher and psychologist William Stern in 1912. Other sources associate the origin of the word with Lewis Terman in 1916. IQ denotes Intelligent Quotient, which is a scientific assessment of one’s intelligence, derived from standardized tests that measure problem-solving abilities spacial imagery, memory, general knowledge, and other factors. While limits exist regarding native intelligence levels, recent studies have revealed that it’s possible to increase one’s intelligence.
The intelligent assessment was carried out on an extensive scale even prior to the emergence of the phrase Intelligent Quotient. In 1904, the French government commissioned psychologist Alfred Binet to create a testing system to differentiate intellectually normal children from those who were mediocre. From Binet’s work emerged the IQ scale called the “Binet Scale”, later called the Simon-Binet scale”.
Subsequently, the phrase Intelligence Quotient, or IQ entered the conventional vocabulary. Lewis M Terman revised the Simon-Binet scale of Intelligence; also known as the Stanford-Binet. The revision gave rise to the following scale currently used in the classification of IQ scores:
* Over 140 – Genius or almost genius.
* 120 – 140 – Very superior intelligence.
* 110 – 119 – Superior intelligence.
* 90 – 109 – Average or normal intelligence.
* 80 – 89 – Dullness.
* 70 – 79 – Borderline deficiency intelligence.
* Under 70 – Feeble-mindedness.
Normal Distribution of IQ Scores
* 50% of IQ fall between 90 and 110.
* 70% of IQ scores fall between 85 and 115.
* 95% of IQ scores fall between 70 and 130.
* 99.5% of IQ scores fall between 60 and 140
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