Further, there are different logic system, and infering that bears at North pole are white from these premises requires certain logic system, but couldn't be in

Further, there are different logic system, and infering that bears at North pole are white from these premises requires certain logic system, but couldn't be infered in others. It could be said that even people (not logicians), who answer that bears there are white, are not using a logic system including the Modus Ponens, because they would also stand that there are darker bears at the North pole, teddy bears, and that even white bears are not entirely white. So indeed, it's hard to judge this Siberian intelligence, without further elaboration. There's a problem of selection, and the system that sets the selection criteria is as important as the population selected. Perhaps the IQ only measures the match between the selection criteria and the population. Raising it or lowering it is caused as much by changes in the population, as changes in the selecting system.