First time? This work was published in 2013:<p>"... Men and women's brains are connected in different ways which may explain why the sexes excel at certain tasks, say researchers. A US team at the University of Pennsylvania scanned the brains of nearly 1,000 men, women, boys and girls and found striking differences.<p>Male brains appeared to be wired front to back, with few connections bridging the two hemispheres. In females, the pathways criss-crossed between left and right. …"<p><a href="https://www.pnas.org/doi/abs/10.1073/pnas.1316909110" rel="nofollow">https://www.pnas.org/doi/abs/10.1073/pnas.1316909110</a>