Eric Boyd wrote:
>>Was the experiment done in such a way that all other factors which affect
>>intelligence (e.g. education, exposure to literature, etc.) were
>>controlled?
>
>3D operations are considered culure-free. Both Raven's Tests is are examples
>of such, specialized one.
This is incorrect. Spatial aptitude is also subject to significant
environmental variance. Music and mathematics are two well known
modifiers.
Dan