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Intelligence: A Scientific Construct

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The term intelligence begs an important question. How can something be measured when it is indefinable? Numerous scientists, psychologists, theorists, neurologists, and many more can concur that intelligence does exist. Yet, to date, none of them can agree upon a universal definition. Therefore, intelligence is known only to be a scientific construct. (Floyd & Kranzler, 2013). Over the years, individuals have attempted to delimit intelligence by means of research, assessments, and theories. Beginning as early as the 19th century, Francis Joseph Gall, presented the scientific measuring tool known as phrenology. He believed mental qualities and functions could be evaluated according to specific faculties mapped out in the brain. (CIA textbook) …show more content…

These processes are planning, attention, simultaneous, and successive (Naglieri & Kaufman, 2001). Planning processes involve higher-order thinking to generate a kind of blueprint to interrupt information in order to solve a problem. Attention processes encompass focused, selective, and sustained attention. It necessitates an individual to focus on a certain stimuli, block out irrelevant stimuli, and maintain the directed focus. Simultaneous processes involve the mental ability to bring together presented information into a whole concept or solution. This would include the ability to recognize patterns. The last process, successive, implicates the cognitive ability to arrange stimuli in a strict, serial order. It is important to note that all four processes are required to be accessed to accomplish tasks of achievement, but not every process will be used to the same degree for any one task (Naglieri & Kaufman, 2001). The Cognitive Assessment System (CAS) is the most widely used test used to measure the PASS processing-based theory of intelligence. The CAS comprises of four hierarchies intended to measure the mental processes mentioned previously (Naglieri et al., 2005). Numerous studies, which will later be discussed, utilize the CAS to determine how accurate the PASS theory is as a determinate and predictor of intellectual abilities in terms of …show more content…

This theory contains two main components: a classification of abilities both broad and narrow, and conjectural rationalizations as to the reasons behind individual’s variances in different cognitive abilities. (CIA TEXTBOOK) CHC is not only made up of two components, it is also based off of three separate previous theories. In order to explain the progression of thought that led to this combined theory, it is imperative to mention several contributors, including Francis Galton and Wilhelm Wundt. Galton is considered to be the founder of the study of individual differences. His interest in measuring these differences sparked other’s interest in mental abilities, including two of his students McKeen Cattell and Charles Spearman. Cattell is credited with devising the term “mental test.” (CIA TEXTBOOK) Spearman later established the “two-factor theory” that measured intelligence in terms of a general factor g and specific factors. Cattell, sometime later, concluded that Spearman’s general factor g should be split into two factors: fluid (Gf) and crystallized (Gc) intelligence. John Horn, a student under Cattell, then expanded this Gf – Gc theory to include several broad abilities. (CIA TEXTBOOK) The last contributor to the CHC theory was Carroll. Carroll proposed a three stratum-model of intelligence. The third stratum represented general intelligence, the

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