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The Intelligence Quotient (IQ) is a numerical measure used to describe an individual's intelligence relative to the general population. Originally, IQ was defined as the ratio of mental age to physical age, multiplied by 100, when assessing the intelligence of children. Mental age was determined based on the average performance in a test corresponding to the individual's age group.
IQ stands for Intelligence Quotient, which is a numerical measurement of an individual's intelligence. It is expressed as a number and is an estimate, as there may be some margin of error in the measurement. IQ is typically determined through intelligence tests that a person takes. The average IQ is defined as 100. A score above 100 indicates a higher performance compared to the average person, while a score below 100 suggests a relatively lower performance.
In the early 1900s, the first intelligence test was developed by French psychologist Alfred Binet. However, the modern practice of IQ testing in the United States can be traced back to the work of psychologist Henry Herbert Goddard. Goddard, who earned his doctorate in psychology from Clark University in 1899, translated Binet's test from French to English. This translated test was used to assess basic intellectual functions in American school children and support mental health diagnoses.
IQ tests assess a specific set of skills that are deemed important in society, as noted by psychologist Scott Barry Kaufman from the University of Pennsylvania. However, Kaufman also emphasizes that IQ tests do not provide a complete picture of an individual's potential. One limitation is that these tests tend to favor those who excel at thinking quickly and on the spot, a skill that not everyone possesses, including Kaufman himself.
The IQ test serves various purposes. It enables the assessment of an individual's capacity for learning, comprehension, concept formation, information processing, and logical reasoning, in comparison to the general population. It provides indications and insights into how one may deviate from or align with societal norms in terms of relational aspects like isolation, rejection, or social distance, as well as intellectual aspects such as ease or difficulties in intellectual activities. Additionally, IQ test results can shed light on an individual's achievements and successes, which may have been acquired through different means or levels of ease compared to others.
Our IQ test is utilized by millions of users worldwide, with new users taking it daily. The statistics derived from the cumulative results validate its reliability in relation to the calibrated IQ scale system represented by the Gaussian Curve.
The concept of IQ score was first introduced in France during the early 20th century. Expert Hans Eysenck later considered the multiple-choice IQ test to be the most comprehensive. The test gained significant popularity in Europe during the 1950s. To assess IQ, one must take a standardized IQ test, which measures abilities in language, mathematics, image processing, memory, and processing speed. Clinical psychologists also use complex standard IQ tests for diagnosis. The scores obtained from these tests are relative and adjusted based on research findings from individuals of the same age group.
The Wechsler Intelligence Scale is considered one of the most reliable IQ tests and is widely used for children worldwide. It encompasses a diverse range of tasks designed to assess various abilities related to intelligence, including verbal and non-verbal reasoning, visual perception, working memory, and processing speed. The test is administered by a qualified psychologist who evaluates the child's performance and determines their IQ score based on the results obtained.
The Wechsler Adult Intelligence Scale (WAIS) is widely recognized as one of the most popular intelligence tests for adults. It consists of 11 subtests that assess various cognitive abilities, including verbal comprehension, arithmetic, and perceptual reasoning. Other commonly used intelligence tests include the Stanford-Binet Intelligence Scale and the Woodcock-Johnson III Tests of Cognitive Abilities. These tests provide valuable insights into an individual's cognitive strengths and weaknesses, and are widely used in clinical and educational settings for assessing intelligence in adults.