Assuming that there was in fact shrinking, could that be caused by being in a warm climate for an extended period of time? Studies have shown that heat affects

Assuming that there was in fact shrinking, could that be caused by being in a warm climate for an extended period of time? Studies have shown that heat affects cognitive ability, but has anyone ever studied if there’s a temporary efect on brain size? https://journals.plos.org/plosmedicine/article?id=10.1371/journal.pmed.1002605 https://journals.plos.org/plosmedicine/article?id=10.1371/jo...