Psychology · Ch 1 — Variations in Psychological Attributes
Variations of Intelligence
Variations of Intelligence
Intelligence is not a single, uniform ability. Psychologists have proposed several ways to understand its different forms, moving beyond a simple IQ score. These variations help explain why a person might excel in one area while struggling in another.
The Two-Factor Theory (Spearman)
Charles Spearman observed that people who did well on one mental test tended to do well on others. From this, he proposed that intelligence has two components:
- General Intelligence (g-factor): A single, shared mental ability that influences performance on all cognitive tasks. It is the core of intelligence.
- Specific Abilities (s-factor): Distinct skills that are unique to particular tasks, such as mathematical reasoning, verbal fluency, or spatial visualisation.
According to Spearman, every intellectual activity involves the g-factor to some degree, plus one or more s-factors. A high g-factor means a person is generally capable across many areas.
The Theory of Primary Mental Abilities (Thurstone)
L. L. Thurstone disagreed with the idea of a single general factor. Using factor analysis, he identified seven distinct, independent mental abilities, which he called primary mental abilities:
- Verbal Comprehension: The ability to understand the meaning of words and ideas.
- Numerical Ability: The ability to perform arithmetic operations quickly and accurately.
- Spatial Relations: The ability to visualise and manipulate objects in two or three dimensions.
- Perceptual Speed: The ability to quickly and accurately detect visual details and similarities.
- Word Fluency: The ability to produce words rapidly, such as in rhyming or anagram tasks.
- Memory: The ability to learn and recall information efficiently.
- Inductive Reasoning: The ability to find rules and principles that apply to a set of examples.
Thurstone argued that a person's intelligence profile is a combination of these separate abilities, not a single score.
The Structure of Intellect Model (Guilford)
J. P. Guilford proposed a much more complex, three-dimensional model. He believed intelligence could be understood by classifying mental abilities along three dimensions:
- Operations: What the person does (e.g., evaluation, convergent production, divergent production, memory, cognition).
- Contents: The type of material on which the operations are performed (e.g., figural, symbolic, semantic, behavioural).
- Products: The form in which the information is processed (e.g., units, classes, relations, systems, transformations, implications).
By combining every possible operation with every content and every product, Guilford's model originally predicted 120 distinct intellectual abilities (later expanded to 150). This model was influential because it highlighted divergent production (the ability to generate many creative ideas) as a separate ability from convergent thinking.
The Theory of Multiple Intelligences (Gardner)
Howard Gardner proposed that intelligence is not a single entity but a set of at least eight distinct intelligences. Each operates relatively independently in the brain. He argued that traditional IQ tests measure only a narrow range of abilities, mainly linguistic and logical-mathematical.
The eight intelligences are:
| Intelligence | Core Ability | Examples of People Who Excel |
|---|---|---|
| Linguistic | Sensitivity to spoken and written language; ability to learn languages and use language to achieve goals. | Poets, writers, orators |
| Logical-Mathematical | Ability to analyse problems logically, carry out mathematical operations, and investigate issues scientifically. | Scientists, mathematicians, engineers |
| Spatial | Ability to recognise and manipulate patterns in wide space (like pilots) and confined areas (like sculptors). | Pilots, surgeons, architects, artists |
| Musical | Skill in performing, composing, and appreciating musical patterns, including rhythm and pitch. | Musicians, composers, singers |
| Bodily-Kinaesthetic | Ability to use one's whole body or parts of the body to solve problems or create products. | Dancers, athletes, surgeons, craftspeople |
| Interpersonal | Ability to understand the intentions, motivations, and desires of other people and to work effectively with them. | Teachers, counsellors, politicians, salespeople |
| Intrapersonal | Ability to understand oneself, to have an effective working model of oneself, and to use that knowledge to regulate one's own life. | Philosophers, psychologists, spiritual leaders |
| Naturalistic | Ability to recognise, categorise, and draw upon features of the environment. | Biologists, farmers, botanists, hunters |
Gardner's theory broadened the concept of intelligence to include talents that are often overlooked in school settings.
The Triarchic Theory of Intelligence (Sternberg)
Robert Sternberg proposed that intelligence is a mental activity directed toward purposive adaptation to, selection of, and shaping of real-world environments relevant to one's life. He identified three aspects of intelligence:
- Componential (Analytical) Intelligence: The ability to think critically and analytically. It involves the mental components used to solve problems, such as analysing, evaluating, and comparing. This is the type of intelligence most measured by standard IQ tests. …