"In this study, we use a large-scale incentivized experiment with nearly 1,300 participants to show that the gender gap in spatial abilities, measured by time to solve a puzzle, disappears when we move from a patrilineal society to an adjoining matrilineal society."
It is presently a commonplace of Western culture that women are worse at spatial reasoning than men, and this is commonly attributed to intrinsic biological differences.
It turns out this may be highly questionable. A study in PNAS studied two nearby tribes in northeast India, one with a strongly patriarchal organisation, one with a strongly matriarchal organisation. Both share the same agrarian diet and lifestyle and DNA tests indicate they are closely related.
In the patriarchal society, women did noticeably worse on spatial reasoning. In the matriarchal society, women and men did about the same.
The authors carefully do not overstate their results, claiming only that they demonstrated that culture influences spatial performance "in the task that we study." However, this promisingly suggests quite a bit of room for improvement of measurable aspects of intelligence may be feasible with proper attention to culture and nurture.
What measurable aspects of intelligence do you attribute to genetic causes? Can you test it this well? How would you fix it and help people be all they can be?
News coverage: ArsTechnica.
The inferential distance between us on the reliability of contemporary academics is too large to cross in a comment thread. So let it simply be taken as read that you do not accept that the assertions of contemporary academics are evidence for what they assert.
This brings us back to the main point of my previous comment. By restricting what you accept as evidence, you make it harder to gather your probability mass into a small region of the space of possibilities.
Let an HGL society be a society in which "[m]en are not allowed to own land at all, any money or goods earned by a male are handed over to his wife or sister, and inheritances go to the youngest daughter in the family." (HGL are the initials of the authors of the study in the OP.) You have claimed that the observation of an HGL society would be "surprising".
The percentage of societies that are HGL societies is something between 0% and 100% (inclusive). Your evidence justifies placing a certain probability distribution over the interval from 0% to 100% for the percentage of societies that are HGL societies. Even though you have restricted the kind of evidence that you will accept, sociobiology and anecdote are still powerful evidence, so it is plausible that they could justify heaping most of your probability mass over the left end of the interval — i.e., over the lower percentages.
But you claim to do more than that. You aren't just claiming to be able to push most of your probability mass towards the left end of the interval. You say that you can heap most of your mass directly over 0.00% (which is what you must have if observing even one HGL society would be "surprising"). Sociobiology is still, to a large extent, a qualitative science. You undertake a heavy burden if you want to argue that such a qualitative science justifies concentrating so much of your probability mass over such a small region in the space of possibilities. Remember, this is a field where we can't even predict with confidence that the percentage of exclusively homosexual males is 0.00%. It isn't plausible that such a theory can justify the high confidence that you claim for such a precise prediction.
Yet oddly, before the Soviet Union fell, my predictions for its future were spot on, while the CIA and academia were completely wrong.
From 1980 onwards there was a vast amount of evidence that the Soviet Union was in a state of rapid collapse - which evidence anyone who paid attention to academia rejected because it was incompatible root and branch w... (read more)