ISC Psychology: Intelligence and Ability Study Guide

Meaning and Nature of Intelligence

• Etymological Origin: The word 'intelligence' is derived from the Latin verb intelligere, which translates to 'to comprehend' or 'to perceive'.

• Historical Evolution: Historically, the study of intelligence was restricted to the cognitive domain. However, modern psychology views it as a multi-dimensional construct.

• Key Definitions:

  • Lewis Terman: Emphasized the importance of the ability to think.

  • Edward Thorndike: Defined it as the ability to learn.

  • David Wechsler: Provided a comprehensive definition: "the global capacity of a person to act purposefully, to think rationally, and to deal effectively with his environment."

  • Alfred Binet: Defined it as a general intellectual capability to reason well with abstract materials, to comprehend well, to have a clear direction of thought, to relate thinking to attain a desirable goal, and to be self-critical.

• Nature of Intelligence:

  • Singular View: Psychologists like Binet and Spearman viewed intelligence as a single characteristic or dimension.

  • Multi-component View: Psychologists like Thurstone and Guilford argued that intelligence consists of independent components.

  • Quality vs. Process: Traditionally viewed as an innate, inherited quality (heredity), modern psychologists emphasize it as a process triggered by environmental stimulation and interaction. Modern consensus gives equal importance to both heredity and environment.

  • Social Context: Modern views emphasize cognitive development through active interaction with the social environment, involving reasoning, remembering, and understanding to meet societal demands.

Creativity and Intelligence

• Definition: Creativity is a cognitive ability closely linked to intelligence. It is the capacity to create, discover, or produce a novel or unique idea or object, or to reshape an existing one.

• Lubart's Six Components (1994): Lubart stated that creativity requires:

  1. Intellectual abilities.

  2. Knowledge.

  3. Specific styles of thinking.

  4. Personality attributes.

  5. Motivation.

  6. A supportive environment.

Classical Theories of Intelligence

• Spearman's Two Factor Theory ($1904$):

  • General Factor ($g$): An inborn, innate mental ability that remains constant for an individual across all activities. It is unique to individuals and higher $g$-factors correlate with greater life success. IQ tests specifically aim to measure this factor.

  • Specific Factor ($s$): Learned and acquired through environmental interaction; varies from activity to activity (e.g., spatial vs. verbal).

  • Mathematical Concept: Intelligence = $g + s_1 + s_2 + s_3 + \dots + s_n$.

  • Criticism: Failed to account for 'group factors' and ignored specific abilities like artistic or musical talents that are not purely 's' but less general than 'g'.

• Thurstone's Multi-Factor Theory ($1930\text{s}$):

  • Rejected the idea of a single 'g' factor. Proposed intelligence as a combination of independent "Primary Mental Abilities" ($PMA$):

    1. Numerical Factor ($N$): Rapid/accurate numerical calculation.

    2. Verbal Factor ($V$): Verbal comprehension and relations.

    3. Spatial Visualisation ($S$): Imaginative manipulation of objects in space.

    4. Memory ($M$): Speed of memorization.

    5. Inductive Reasoning ($RI$): Inferring conclusions from specific instances.

    6. Word Fluency ($W$): Speed of thinking of isolated words.

    7. Perceptual Speed ($P$): Accuracy in perceiving objects/details.

    8. Deductive Reasoning ($RD$): Ability to use generalized results (added later).

    9. Problem-solving ability factor ($PS$): Solving problems independently (added later).

• Cattell's Fluid and Crystallised Intelligence:

  • Fluid Intelligence ($Gf$): Inherited abilities for thinking and reasoning. Dependent on neurological development and unaffected by education/culture. Develops fully by late adolescence then declines.

  • Crystallised Intelligence ($Gc$): Accumulated knowledge stored over a lifetime. Includes vocabulary and global affairs. Increases or maintains stability with age, allowing older individuals to sometimes outperform younger ones.

• Guilford's Structure of Intellect ($SOI$) Model ($1967$):

  • A three-dimensional classification resulting in $6 \times 5 \times 6 = 180$ factors.

  • Operations ($6$): Cognition, Memory Recording, Memory Retention, Convergent Thinking, Divergent Thinking, Evaluation.

  • Contents ($5$): Visual, Auditory, Symbolic, Semantic, Behavioural.

  • Products ($6$): Units, Classes, Relations, Systems, Transformations, Implications.

Modern Theories of Intelligence

• Information Processing Approach: Views the mind like a computer, focused on how information from the environment is processed, analyzed, and how these processes change with maturity.

• Gardner's Theory of Multiple Intelligence ($1983$): Originally listed $6$ types, now includes at least $10$:

  1. Linguistic: Verbal skills (poets, orators).

  2. Logical-mathematical: Abstract thinking (scientists, engineers).

  3. Spatial-visual: Mentally visualizing images (sailors, architects).

  4. Bodily kinesthetic: Handling objects/body (athletes, surgeons).

  5. Musical: Pitch and rhythm appreciation (composers).

  6. Interpersonal: Responding to others' moods (teachers, politicians).

  7. Intrapersonal: Self-awareness of feelings.

  8. Naturalist: Sensitivity to the natural world (botanists).

  9. Existential: Tackling philosophical human questions.

  10. Spiritual: Connection with the universe and meaning in life.

• Sternberg's Triarchic Theory ($1985$):

  • Componential/Analytic: Critical thinking. Sub-components: Meta-components (planning), Knowledge acquisition (learning), Performance (doing).

  • Experiential/Creative: Novelty (handling new situations) and Automation (performing repetitive tasks without extra thought).

  • Contextual/Practical: "Street smarts" using adaptation (adjusting oneself), shaping (modifying the environment), and selection (replacing a failing environment).

  • Anecdote (Practical Intelligence): A Florida garbage collector saved time by carrying empty cans to the next house rather than returning them immediately to the truck, effectively reducing trips.

Measurement and Classification of Intelligence Tests

• Classification Criteria:

  • Nature of Tasks: Verbal (language-based, e.g., Army Alpha) vs. Performance (manipulating materials, e.g., Army Beta).

  • Administration: Individual (one-on-one, e.g., Wechsler) vs. Group (simultaneous, e.g., RPM).

  • Scoring: Age Scale (awarding credits of months, e.g., Stanford-Binet) vs. Point Scale (awarding points, e.g., WAIS).

  • Time/Difficulty: Speed Tests (many easy items, limited time) vs. Power Tests (difficult items, ample time).

• Intelligence Quotient ($IQ$):

  • Formula: $IQ = \frac{MA}{CA} \times 100$ (where $MA$ = Mental Age, $CA$ = Chronological Age).

  • Calculations Examples:

    1. Individual A: $MA = 5, CA = 5 \rightarrow (5/5) \times 100 = 100$ (Average).

    2. Individual B: $MA = 2, CA = 5 \rightarrow (2/5) \times 100 = 40$ (Below Average).

    3. Individual C: $MA = 8, CA = 5 \rightarrow (8/5) \times 100 = 160$ (Above Average).

  • Growth Ceilings: Growth typically stops at age $16$. For gifted individuals, it may extend to ages $20\text{-}25$. For abnormal individuals, it stops between ages $3\text{-}6$.

  • The Flynn Effect: Named after James Flynn, describing the consistent increase in standardized IQ scores over the past decades.

Specific Intelligence Tests

• Stanford-Binet Intelligence Test:

  • Provides factor scores in: Verbal Reasoning, Abstract/Visual Reasoning, Quantitative Reasoning, and Short-term Memory.

  • Scoring: Uses a "basal age" (highest level where all items are correct) and "ceiling age" (level where no items are correct). Mental age = Basal age + ($2 \text{ months} \times \text{correct items above basal age}$).

• Wechsler Adult Intelligence Scale ($WAIS-III$):

  • Provides Verbal $IQ$, Performance $IQ$, and Full Scale $IQ$ ($FSIQ$).

  • Includes subtests like Information, Arithmetic, Digit Span, Block Design, and Digit Symbol Coding.

  • Standardized with a mean of $100$ and a standard deviation ($SD$) of $15$.

• Raven's Progressive Matrices ($RPM$):

  • A non-verbal, culture-fair test measuring "eductive ability" (making sense of complexity) and "reproductive ability" (recalling information).

  • Forms: Standard (sets $A\text{-}E$), Coloured (for children/elderly), and Advanced (for above average individuals).

Levels and Classification of Intelligence

• Wechsler Standard Classification:

  • $130 \text{ and above}$: Very Superior

  • $120\text{-}129$: Superior

  • $110\text{-}119$: High Average

  • $90\text{-}109$: Average

  • $80\text{-}89$: Low Average

  • $70\text{-}79$: Borderline

  • $69 \text{ and below}$: Extremely Low

• Giftedness: Termed by Joseph Renjulli as high ability, task commitment, and creativity.

  • Example: Akrit Jaswal, child prodigy surgeon at age $7$ with an $IQ$ of $146$.

• Backwardness/Retardation (DSM-IV Classification):

  • Borderline: $IQ$ $70\text{-}84$.

  • Mild (Educable): $IQ$ $55\text{-}69$ ($85\%$ of population).

  • Moderate (Trainable): $IQ$ $40\text{-}54$ ($10\%$ of population).

  • Severe: $IQ$ $25\text{-}39$ ($3\text{-}4\%$ of population).

  • Profound: $IQ$ below $25$ ($1\text{-}2\%$ of population). Need constant institutional care.

Aptitude, Achievement, and Interest

• Aptitude: The innate potential for a specific type of work (e.g., measured by the General Aptitude Test Battery or $GATB$, which tests $9$ abilities across $12$ tests).

• Achievement: Specifically acquired skill or knowledge after training (e.g., diagnostic tests identify weaknesses; end-of-course tests measure training success).

• Interest: Tendency to be absorbed in an experience (e.g., Strong-Campbell Interest Inventory or $SCII$, which uses $291$ items to profile interests against Holland Codes: Realistic, Investigative, Artistic, Social, Enterprising, Conventional).

• Emotional Intelligence ($EQ$): Formulated by Peter Salovey and John Mayer. High $EQ$ individuals perceive non-verbal cues, regulate their own emotions, and use emotional information to guide thinking and problem-solving.