— Cognitive science

Heritability of IQ

Term

h²

Domain

Cognitive psychology

First introduced

20th century

IQ relevance

Direct

Heritability of IQ (h²) refers to the proportion of variance in IQ attributable to genetic variation; ~0.5-0.8 in adults. The concept is central to modern cognitive psychology and psychometrics — particularly to how IQ is theorized, measured, and interpreted.

What heritability of iq actually means

In cognitive psychology, heritability of iq is operationalized as the proportion of variance in IQ attributable to genetic variation; ~0.5-0.8 in adults. It is distinct from related constructs in that it specifically captures a distinct, measurable aspect of cognitive function.

How it's measured

Measured through standardized testing batteries and laboratory paradigms specific to the construct.

Relationship to IQ

Heritability of IQ is integrated into the broader theory of IQ and cognitive function. It contributes to and is partially measured by composite IQ scores.

Test your heritability of iq and 5 other cognitive axes

Core Brain's 20-minute test decomposes IQ into six cognitive components so you see your specific profile.

Why this matters

Understanding heritability of iq is foundational for anyone trying to interpret an IQ score meaningfully. The single composite IQ number conceals significant variation across cognitive functions; understanding the components is how you go from "I scored 130" to "I scored 130, with particular strength in [X] and relative weakness in [Y]."

Frequently asked

What is heritability of iq?

Heritability of IQ (h²) refers to the proportion of variance in IQ attributable to genetic variation; ~0.5-0.8 in adults. It is a central concept in cognitive psychology and IQ measurement.

How is heritability of iq different from general IQ?

Composite IQ is a weighted aggregate of multiple cognitive abilities. Heritability of IQ is one specific component or property that contributes to but is not identical to the IQ score.

Can heritability of iq be improved?

Generally limited room for improvement in trait-level cognitive properties; significant variability in measured performance day-to-day.