Lecture 1 - Introduction Flashcards
what is diversity?
distribution
what percentage of people are in the +/-1 deviation in a normal distribution?
68.2%
what percentage of people are in the +/-2 deviation in a normal distribution?
95.5%
what percentage of people are in the +/-3 deviation in a normal distribution?
99.7%
4 domains of human behaviour
- Cognitive capabilities (i.e. intelligence)
- Personality
- Emotions
- Physical and mental health
3 levels of explanation
- Innate (e.g. genetic) factors
- Environmental (e.g. cultural) factors
- Neurobiological (e.g. neural activation) factors
what does the Flynn effect describe?
environmental effect on cognitive abilities
what did the Flynn effect show?
- Each generation was slightly more intelligent than previous generation
differential psychology
Study of individual differences (aspects of cognition, emotion, motivation, behaviour, abilities, health, etc.)
what does differential psychology study?
how and why people differ
- Evaluation of the processes underlying observed individual differences
who were the pioneers in differential psychology?
Galton and Spearman
what did Galton do in terms of differential psychology?
individual differences of talent and character (1865), index of correlation (1888)
intelligence theory and research; spearman (1904) idea of general intelligence which still dominates psychology today
what did Spearman do in terms of differential psychology?
factor analysis (1904) allowing data-driven study
intelligence theory and research; spearman (1904) idea of general intelligence which still dominates psychology today
example of an early study on individual differences (Heyman)
- Heymans early empirical studies
○ Coded 110 historical figures on 88 personality characteristics and on 3 major personality traits to build classification of personality types (1908).
○ Large scale questionnaire study (1927), observer data from roughly 400 family doctors for 2415 individuals from 437 families
○ Concluded impulsivity in hereditary to between 42 and 48%
early-20th century advancements in differential psychology
- Rapid development of intelligence and personality testing:
○ IQ test introduced (Simon-Binet test, 1905)
○ IQ tests used to screen immigrants at Ellis Island in US
○ IQ as ratio of mental age to chronological age (Stern, 1914)
○ Introduction of ability (Army Alpha test) and emotional testing for military selection
○ Advancement in psychometrics - the theory and technique of measurement