Similar measures of verbal comprehension such as vocabulary, memorized facts, and relationships between words are also used to generate this index. VCI is also used for the WISC as a measure of crystallized knowledge. Since our knowledge of vocabulary, facts, and relationships between words is acquired, the VCI is considered a measure of crystallized knowledge. For the WAIS, the VCI is calculated based on scores of tests dealing with verbal knowledge. One of the scales that factors into the Full Scale IQ of the Wechsler tests is the Verbal Comprehension Index (VCI). These could be historical facts, such as remembering Columbus arrived in America in 1492, or scientific facts, like water freezing at 0 degrees Celsius or 32 degrees Fahrenheit. It can be cultivated at school, work, the media, or just the everyday environment you live in. Think of all of the facts you know as a result of your experience and education. This type of intelligence is based on knowledge that is acquired or learned. Many people have likely heard the term but don’t know the definition of crystallized intelligence. The Wechsler scales, however, also recognize that speed of processing and working memory are factors of general intelligence and is reflected in the Full Scale IQ of the Wechsler Adult Intelligence Scale ( WAIS) and the Wechsler Intelligence Scale for Children ( WISC). The concept of generalized intelligence as a combination of crystallized and fluid intelligence is represented as the General Ability Index on Wechsler tests of intelligence. Between fluid intelligence and crystallized intelligence, these were thought to represent the average level of all different types of intelligence an individual has. These two concepts together formed what was known as general intelligence, and was first proposed by psychologist Raymond Cattell. While we have all heard the terms book smart, street smart, or social intelligence, tests of intelligence were developed with two types of intelligence in mind: crystallized and fluid intellect. Intelligence has been defined in many different ways.
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