Who is the proponent of the formula for calculating Intelligence Quotient (IQ)?
Detailed Explanation
📌 Core Theoretical Concept:
The original formula and concept for calculating Intelligence Quotient (IQ) was proposed by the German psychologist William Stern in the year 1912. He defined IQ as the ratio of Mental Age (MA) to Chronological Age (CA). Although later in 1916, Lewis Terman modified this formula by multiplying it by 100 to give it the modern practical form (IQ = MA/CA × 100) in the Stanford-Binet Intelligence Scale, the fundamental credit for propounding the IQ concept and ratio formula goes directly to William Stern. This remains a cornerstone in educational psychology and child development for assessing cognitive abilities.
📊 Key Exam Points:
- William Stern introduced the initial IQ concept in 1912 as Mental Age divided by Chronological Age.
- Lewis Terman revised it in 1916 by adding the multiplier '100' for percentage representation.
- Charles Spearman is famous for his Two-Factor Theory of Intelligence (General 'G' and Specific 'S' factors).
- Distractors like Stern & Johnson or Hebb are incorrect as Hebb worked on neuro-psychological organization of intelligence rather than the IQ ratio formula.
📖 Theoretical Reference: William Stern's pioneering contribution forms the foundation of psychometrics. For deeper insights, review Theories of Intelligence and standardized testing procedures in pedagogy.
🎯 Exam Perspective: Key Insights for Teacher Exams Detailed Solution ➔
Deep pedagogical analysis:
In teacher eligibility tests like CTET, UPTET, and various state TETs, questions regarding the pioneers of psychological testing frequently appear. Aspirants often confuse William Stern with Lewis Terman. Remember that while the original ratio concept belongs to Stern, the multiplication by 100 to yield a whole number was popularized by Terman. Understanding this distinction helps educators accurately apply intelligence testing methods to cater to diverse learners in inclusive classrooms, ranging from gifted students to those with intellectual disabilities.