The substantial g-loadings of all purely cognitive tests
in the current study contradict Gardner's assertion that
there are at least eight independent intelligence domains.
Although Gardner has acknowledged the existence of g
and has conceded that the eight intelligences might not
be entirely independent, his contention that positive
correlations between various cognitive tasks are largely
due to verbal demands was clearly not supported in this
study, in which those verbal demands were minimized.
Instead, measures of Linguistic, Spatial, Logical-Mathematical,
Naturalistic, and Interpersonal intelligences
showed a positive manifold of correlations, substantial
loadings on a g factor, and substantial correlations with
an outside measure of general intelligence. The common
element that saturated the highly g-loaded tests most
strongly was their demand on reasoning abilities, not
their specifically verbal content.