The differentiation hypothesis and the Flynn effect
by
Juan-Espinosa M, Cuevas L, Escorial S, García LF.
Facultad de Psicología,
Universidad Autónoma de Madrid, Spain.
manuel.dejuan@uam.es
Psicothema. 2006 May;18(2):284-7.

ABSTRACT

Many studies have shown that IQs have been increasing over the last half century. These increases have come to be known as "the Flynn effect". The "Flynn effect" represents a difference on ability-level between groups of the same age but different cohort. The ability-level differentiation hypothesis represents a difference on the relevance of cognitive factors between groups of high and low ability. Hence, it should be possible to imitate the ability-level differentiation effect by comparing groups of the same age but different cohort. The indifferentiation hypothesis represents no differences on the relevance of cognitive abilities in all age groups within the same cohort. The aim of the present study is to test the relationships between these phenomena. For this purpose we analyzed the American standardisation samples of the WISC, WISC-R and WISC-III. Results support the link between the Flynn effect and the differentiation hypothesis. Also, reported evidence replicate previous findings supporting the indifferentiation hypothesis. Implications for the assessment of the intelligence are discussed.

NR2B gene
Microcephalin
SNAP-25 gene
Cognitive genetics
Human self-domestication
Brain size/human evolution
Alzheimer's disease: resources
Transhumanism/Brave New World?
Francis Galton and contemporary eugenics
Gene therapy and performance enhancement
Preimplantation genetics and stem cell therapy
Cathepsin D, HLA-DRB1 and APO and intelligence
Institute for Germinal Choice ('Genius Sperm Bank')

Refs
and further reading

HOME
Resources
Wireheading
BLTC Research
nootropic.com
Superhappiness?
Utopian Surgery?
The Good Drug Guide
The Abolitionist Project
The Hedonistic Imperative
The Reproductive Revolution
MDMA: Utopian Pharmacology
Critique of Huxley's Brave New World