Western Theories of Intelligence: Spearman, Gardner & Sternberg

1. What is Intelligence?

David Wechsler formulated one of the most widely accepted definitions: “Intelligence is the aggregate or global capacity of the individual to act purposefully, to think rationally, and to deal effectively with his environment.”

Western psychology has debated for over a century whether intelligence is a single unitary ability or a collection of distinct, independent intelligences.

2. Charles Spearman’s Two-Factor Theory (1904)

Using statistical factor analysis, British psychologist Charles Spearman observed that individuals who score high on one cognitive test tend to perform well on other diverse tests. He concluded that intelligence consists of two factors:

Spearman's Two-Factor Architecture

'g' Factor (General Intelligence)

Nature: Innate, biological, and universal mental energy present across all cognitive operations.
Role: Determines an individual's overall intellectual capacity and problem-solving power.
Constancy: Remains relatively constant throughout an individual's life.

's' Factor (Specific Abilities)

Nature: Learned, specialized capabilities required for specific distinct activities (e.g., musical skill, mathematical speed, painting).
Variation: A single person can possess very high 's' for music but low 's' for mechanical tasks.
Modifiability: Can be trained, acquired, and enhanced through education and practice.

3. Howard Gardner’s Theory of Multiple Intelligences (1983)

In his groundbreaking book Frames of Mind, Harvard psychologist Howard Gardner rejected the traditional concept of a single IQ score. He proposed that human beings possess at least 8 distinct, autonomous intelligences, each governed by different brain circuits:

Gardner's 8 Intelligences

1. Linguistic Intelligence Sensitivity to spoken and written language, vocabulary, grammar (writers, poets, lawyers).

2. Logical-Mathematical Capacity to analyze problems logically, carry out mathematical calculations, and scientific inquiry (mathematicians, scientists).

3. Spatial Intelligence Ability to visualize, manipulate mental spaces, and recognize patterns (architects, pilots, painters).

4. Bodily-Kinesthetic Skill in using one's whole body or hands to perform movements and craft items (dancers, athletes, surgeons).

5. Musical Intelligence Skill in performance, composition, and appreciation of pitch, rhythm, and tone (composers, vocalists).

6. Interpersonal Intelligence Ability to understand and interact effectively with other people's moods, motives, and desires (leaders, counselors, teachers).

7. Intrapersonal Intelligence Deep capacity for self-understanding, awareness of personal strengths, emotions, and goals (philosophers, yogis).

8. Naturalistic Intelligence Expertise in recognizing flora, fauna, natural phenomena, and ecological patterns (botanists, wildlife conservationists).

4. Robert Sternberg’s Triarchic Theory of Intelligence (1985)

Robert Sternberg took an information-processing approach, arguing that traditional IQ tests only measure book-smarts. He proposed three fundamental sub-theories:

Sternberg's Triarchic Model of Intelligence

Analytical Intelligence

Academic problem solving, evaluating options, logic, and critical thinking measured by traditional tests.

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Creative Intelligence

Ability to deal effectively with novel situations and formulate original, inventive solutions.

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Practical Intelligence

"Street smarts": Adapting to everyday environments, shaping situations, or selecting new contexts to succeed.

5. Comparative Evaluation for Exam Revision

Theory	Pioneer	Core Concept	Practical Implication
Two-Factor Theory	Charles Spearman	General factor (‘g’) + Specific factors (‘s’)	Supported unitary IQ testing
Multiple Intelligences	Howard Gardner	8 separate, independent mental competencies	Revolutionized school education and child development
Triarchic Theory	Robert Sternberg	Analytical + Creative + Practical Intelligence	Emphasized real-world success over bookish test scores

Western Theories of Intelligence: Spearman, Gardner & Sternberg | BA Notes