They found that 40% of the variation in knowledge (called "crystallised intelligence" by the researchers) and 51% of the variation in problem-solving skills ("fluid-type intelligence") between individuals could be accounted for by the differences in DNA.
A principal components analysis suggested that the Spot-the-Book and Spot-the-Country both loaded onto a crystallised-type intelligence factor.
To take into account the methodological quality of primary data and to avoid misleading and biased results, the studies with age-related confounds were blocked by confound type (intelligence, ongoing task difficulty) and analyzed separately.
(b) The perception factor of the Tanaka B-type intelligence test (TBIT) (Tanaka et al. 2003) type 3B.
In summary, ageing is associated with both generalised brain atrophy, and changes in cognitive ability – a relative preservation of crystallised-type and decline in fluid-type intelligence.
With age both brain size and fluid-type intelligence decline, and regional atrophy is often suggested as causing decline in specific cognitive abilities.
[E] Tanaka B-type intelligence test [Tanaka et al., 2003], a non-verbal mass intelligence test used for third-year junior high school and older examinees, does not include story problems but uses figures, single numbers, and letters as stimuli.
Let's stop being biased by our own type of intelligence, and our own type of bodies, and accept that machine intelligence is different but still useful.
Extreme fear of one type of intelligence mistake, however, has repercussion not only on the likelihood of committing the other type of error but in the value of information and the methods used to obtain it.
Following are some important types of intelligence.
