Variations in Psychological Attributes

2.1 Core concepts

Individual differences are the distinctiveness and variations among people's characteristics and behaviour patterns. This trait-based view contrasts with situationism, the position that situations and circumstances exert powerful influence on behaviour and that human behaviour is largely a result of external factors (NCERT §Individual Differences in Human Functioning, p. 2). Assessment is the first step in understanding any psychological attribute — the measurement of attributes using multiple methods against standards of comparison. Formal assessment is objective, standardised and organised; informal assessment is open to subjective interpretation (NCERT §Assessment of Psychological Attributes, p. 3). Five major domains are studied by psychologists: Intelligence (global cognitive capacity to understand the world, think rationally and use resources effectively), Aptitude (the underlying potential for acquiring a specific skill), Interest (preference for activities), Personality (enduring distinguishing characteristics) and Values (enduring beliefs about ideal behaviour) (NCERT pp. 3-4). The major assessment methods are the psychological test, interview, case study, observation and self-report (NCERT pp. 4-5).

The conceptual heart is intelligence. Alfred Binet described intelligence as the ability to judge, understand and reason well, while David Wechsler offered a definition still widely cited: intelligence is the "global and aggregate capacity of an individual to think rationally, act purposefully and deal effectively with the environment" (NCERT §Intelligence, p. 5). Later theorists like Howard Gardner and Robert Sternberg added that intelligent people not only adapt to the environment but also actively modify and shape it. Theories fall under two broad approaches: the psychometric approach, which treats intelligence as an aggregate of abilities measurable as a single index, and the information-processing approach, which focuses on the cognitive processes used in reasoning and problem solving (NCERT §Theories of Intelligence, p. 5).

Within the psychometric tradition, Charles Spearman's two-factor theory (1927) used factor analysis to argue that intelligence consists of a g-factor (general intelligence common to all tasks) plus task-specific s-factors (NCERT p. 6). Louis Thurstone proposed seven Primary Mental Abilities — Verbal Comprehension, Numerical Abilities, Spatial Relations, Perceptual Speed, Word Fluency, Memory and Inductive Reasoning. Arthur Jensen proposed a hierarchical model with two levels — Level I (associative learning / rote) and Level II (cognitive competence). J.P. Guilford's Structure-of-Intellect model arranged intelligence into a three-dimensional cube — operations × contents × products — yielding 6 × 5 × 6 = 180 distinct intellectual cells (NCERT §Theories, p. 6).

Howard Gardner's Theory of Multiple Intelligences rejects the idea of a single g-factor and identifies eight independent intelligences — Linguistic (word smart, characteristic of poets and writers), Logical-Mathematical (scientific/mathematical reasoning), Spatial (navigation, sculpture), Musical, Bodily-Kinaesthetic (athletes, dancers, surgeons), Interpersonal (understanding others — characteristic of psychologists, religious leaders), Intrapersonal (knowledge of self) and Naturalistic (sensitivity to natural environment) (NCERT §Theory of Multiple Intelligences, pp. 7-8). Robert Sternberg's Triarchic Theory (1985) divides intelligence into three subtheories: Componential (analytical — comprising knowledge-acquisition, meta and performance components), Experiential (creative — using past experience to solve novel problems) and Contextual (practical — sometimes called "street smartness" or "business sense") (NCERT pp. 8-9). The PASS Model developed by J.P. Das, Jack Naglieri and Kirby (1994) identifies four interdependent cognitive functions — Planning, Attention-arousal, Simultaneous and Successive processing — measured by the Cognitive Assessment System (CAS) for ages 5-18 (NCERT pp. 9-10).

Intelligence is quantified using Mental Age, introduced by Binet and Simon (1908) as a measure of a person's intellectual development relative to their age group; William Stern (1912) devised the IQ formula: IQ = (MA/CA) × 100, where the mean IQ is set at 100 and scores form a normal (bell-shaped) curve (NCERT §Assessment of Intelligence, pp. 10-11). Table 1.1 (p. 11) classifies IQ ranges with descriptive labels and population percentages: >130 Very superior (2.2%), 120-130 Superior (6.7%), 110-119 High average (16.1%), 90-109 Average (50%), 80-89 Low average (16.1%), 70-79 Borderline (6.7%), and below 70 Intellectually disabled (2.2%). The American Association on Mental Deficiency (AAMD) defines intellectual disability by three criteria: significantly sub-average general intellectual functioning, deficits in adaptive behaviour, and manifestation during the developmental period (0-18 years) (NCERT §Intellectual Deficiency, p. 12). Disability levels run Mild (55-70), Moderate (35/40-50/55), Severe (20/25-35/40) and Profound (<20/25). At the other end of the distribution, giftedness combines high ability, high creativity and high commitment; it is broader than talent, which refers to remarkable ability in a specific field (NCERT §Intellectual Giftedness, pp. 12-13).

Tests of intelligence are classified by administration (Individual vs Group), language demand (Verbal, Non-Verbal, Performance) and cultural loading (Culture-Fair vs Culture-Biased). Raven's Progressive Matrices is the leading non-verbal test, while Kohs' Block Design is performance-based. Indian contributions include Mohsin's Hindi test (1930s), NCERT's NLEPT and Bhatia's Battery of Performance Tests (NCERT pp. 13-15).

Intelligence sits within culture too: Lev Vygotsky's notion of technological intelligence (Western, individual, achievement-oriented) contrasts with the Indian concept of integral intelligence (buddhi). Integral intelligence stresses connectivity with the social and world environment and includes four competencies: cognitive capacity, social competence, emotional competence and entrepreneurial competence (NCERT §Culture and Intelligence, pp. 15-17). Emotional intelligence, conceptualised by Salovey and Mayer, is the ability to monitor one's own and others' emotions, discriminate among them, and use the information to guide thinking and actions, expressed as EQ (NCERT §Emotional Intelligence, p. 17).

Intelligence must be distinguished from related constructs. Aptitude is a combination of characteristics indicating an individual's capacity to acquire specific knowledge or skill after training; common test batteries include the Differential Aptitude Test (DAT) with eight subtests, the General Aptitude Test Battery (GATB) and ASVAB (NCERT pp. 17-18). Aptitude must be carefully distinguished from achievement (current attainment) and interest (preference). Aptitude is about potentiality; achievement is about current performance; interest is about preference. Creativity is the production of ideas, objects or problem solutions that are novel, appropriate and useful. Creativity tests are open-ended, measure divergent thinking and have no specified right answer — in contrast to intelligence tests, which assess convergent thinking with a single correct answer (NCERT §Creativity, pp. 18-20). Lewis Terman's classic longitudinal study of high-IQ children showed that a certain minimum intelligence is necessary for creativity but high IQ does not guarantee creativity — many of Terman's gifted children did not turn out to be especially creative adults. NCERT therefore concludes that intelligence and creativity are related but separate constructs, and that an adequate psychological assessment must examine both dimensions along with aptitude, interest, personality and values to capture the full range of individual differences.

2.2 Definitions to memorise

2.3 Diagrams / processes to remember

• Fig. 1.1 — Elements of Triarchic Theory of Intelligence (p. 8): Three subtheories — Contextual, Experiential and Componential — with the Componential subtheory branching into Metacomponents (control/monitor/evaluate strategies), Performance components (execute selected strategies) and Knowledge-acquisition components (encode/combine/compare new information).
• Fig. 1.2 — Normal Curve of IQ Distribution (p. 11): Symmetrical bell-shaped curve with mean = 100; intellectual-deficiency tiers (profound, severe, moderate, mild) sit on the left, average mass in the centre (~50%), High Average / Superior / Very Superior on the right.
• Fig. 1.3 — Specimen item from Raven's Progressive Matrices Test (p. 14): An incomplete visual pattern with six alternatives — the test-taker selects the one that best completes the pattern.
• Table 1.1 — IQ Range, Descriptive Label, % in Population (p. 11): Memorise the ranges and population percentages — they are frequent direct-recall items.
• Table 1.2 — Some Tests Developed in India (p. 15): Verbal (CIE, Jalota, Mehta, Mohsin, Allahabad, Kulshrestha Stanford-Binet adaptation, Joshi) and Performance (CIE Non-verbal, Bhatia's Battery, Draw-a-Man by Pathak, Wechsler adaptation by Ramalingaswamy) — distinguish between verbal and performance instruments.

2.4 Common confusions / NTA trap points

• Binet's Uni/one factor theory vs. Spearman's two-factor theory — Binet (pre-1927) saw intelligence as one set of abilities; Spearman split it into g and s. NTA often swaps the names.
• Mental Age was given by Binet & Simon (1908); IQ formula was devised by William Stern (1912) — not by Binet.
• Gardner's 8 intelligences are independent; Sternberg's 3 are types of one intelligence — don't conflate.
• Componential = analytical, Experiential = creative, Contextual = practical/'street smartness' — NTA loves matching these.
• Giftedness requires high ability + high creativity + high commitment; talent is narrower (field-specific). Athletes can be gifted but in psychomotor terms.
• Aptitude = potential + training; Achievement = current performance; Interest = preference. Aptitude is potentiality to perform, interest is preference to perform.
• Convergent thinking is assessed by intelligence tests; divergent thinking by creativity tests.
• Technological intelligence (Western) ≠ Integral intelligence (Indian/buddhi) — integral includes affective and motivational components.
• PASS stands for Planning, Attention-arousal, Simultaneous and Successive processing — not Personality-Aptitude-Skill-Strategy.
• AAMD's three criteria for intellectual disability — sub-average IQ, adaptive-behaviour deficit, onset by age 18. Missing any criterion changes the diagnosis.

2.5 Thinkers and theories at a glance