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Sex differences in human intelligence have long been a topic of debate among researchers and scholars. It is now recognized that there are no significant sex differences in average IQ, [1] [2] though particular subtypes of intelligence vary somewhat between sexes. [3] [4]
Nyborg is a controversial figure among the Danish public for his research on topics such as the inheritance of intelligence and the relationship between sex and intelligence. In 2004, he wrote an article in Personality and Individual Differences which claimed a five-point average IQ difference in favour of men. [5]
The 21st century has witnessed a resurgence of research on gender differences in variability, with most of the emphasis on humans. The results vary based on the type of problem, but some recent studies have found that the variability hypothesis is true for parts of IQ tests, with more men falling at the extremes of the distribution.
Results showed that the average firstborn had an IQ of 103, compared to 100 for second children and 99 for third children. ... You didn't have sex until after high school.
The average fertility in his study was correlated at −0.031 with IQ for white women and −0.086 for black women. Vining argued that this indicated a drop in the genotypic average IQ of 1.6 points per generation for the white population, and 2.4 points per generation for the black population. [11]
This is backed by another study that says a 6 foot tall person earns, on average, nearly $166,000 more during a 30-year career span than someone who is 5 feet 5 inches, regardless of gender, age ...
Psychological sex differences are thought by some to reflect the interaction of genes, hormones, and social learning on brain development throughout the lifespan. A 2021 meta-synthesis led by Lise Eliot found that sex accounted for 1% of the brain's structure or laterality, finding large group-level differences only in total brain volume. [1]
For example, childhood exposure to lead — associated with homes in poorer areas [82] — correlates with an average IQ drop of 7 points, [83] and iodine deficiency causes a decline, on average, of 12 IQ points. [84] [85] Such impairments may sometimes be permanent, but in some cases they be partially or wholly compensated for by later growth.