I say this because it is clear that certain personality traits are deleterious to certain mental abilities, processing speed being one, and advantageous to others, e.g., verbal comprehension (the person who reads slower and has a need for precision is almost certainly more likely to comprehend more than another person with a similar level of g but will usually have a lower processing speed).

A person's level of g does not vary simply because one develops personality traits that are conducive to high scores on a given index or indices, and if IQ tests could yield deceptive results simply because one student has a need for precision and accuracy and another person does not, they would not be a reliable measure of g by any means, and yet the full-scale IQ's of different IQ tests all have very high correlations (e.g., the correlation between the WAIS-IV and the SB-V is r = 0.89).

To state it simply, if a person develops certain behaviors and traits that have an adverse or propitious affect on certain mental abilities, it will show up on other indices of a good IQ test. For example, a person who reads very slowly and has an obsessive need to understand all of the subject matter under immediate discussion is likely to have a very high verbal comprehension index, but this will be negated by a much lower processing speed index. A person whose verbal comprehension index is high as a result of his or her level of g will not have such a mitigation in processing speed.

As far as working memory is concerned, it is probably the least affected by the aforementioned personality trait; verbal comprehension, followed by perceptual reasoning, are the most highly inflated, while working memory could be not affected at all (although the child may have a somewhat higher arithmetic score due to an abnormal facility with quantitative reasoning as a result of obsessive tendencies that result in an "over-learning" of mathematics).