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He stated that greater male performance on items such as Picture Arrangement, Object Assembly, Picture Completion and Block Design is because these tests measure visual-spatial abilities in which males typically perform better than females.In 2000, researchers Roberto Colom and Francisco J.After a study with a nationally representative sample of 926 participants in the UK, no sex difference was found in the Raven's Progressive Matrices test. Keith on 25 subtests of Woodcock-Johnson Tests of Cognitive Abilities, along with a sample of 6,818 adults and children from 6 to 59, found females scoring higher on the latent processing speed (Gs) factor, a small male advantage on the latent comprehension–knowledge (Gc) factor, higher male score on the latent visual–spatial reasoning (Gv) and higher male latent quantitative reasoning (RQ) factor.However the sex difference in general intelligence (g-factor) was inconsistent in children with small higher female g factor during adolescence, and consistent higher female latent g factor during adulthood.A woman has worn her Fitbit monitor during sex and published the results online in the name of science.
The monitor recorded an average of 109 beats per minute (bpm), which is in the “fat burning range”, peaking during at 123bpm the woman’s first orgasm.
In 2007, Johnson and Bouchard (2007) conducted 40-60 mental tests that were not constructed to eliminate sex differences also found no sex differences in general intelligence or g factor except in residual factors such as verbal abilities and mental rotation.
A 2009 study published in the Archives of Clinical Neuropsychology also found no sex differences in fluid intelligence except female 8 point advantage on writing and male 4 point advantage in math among 22-90 year old participants in a sample of 500 participants.
The finding of the study confirmed Lynn's theory that males develop slower, but did not replicate results that males after 16 years old should have higher g factor.
Lead researcher Timothy Keith suggests past researchers like Lynn's had used emergent scores to calculate g factor which is not accurate since most intelligent theories define g factor as a latent variable and not an emergent one. Keith also found no significant sex differences in latent g factor among participants of 5- to 17-year-olds on a different IQ test known as the Differential Ability Scales.
He also proposed that discrimination, lack of opportunity, women's responsibilities in motherhood, or emotional factors may have accounted for the fact that few women had careers in intellectual fields.