Aaron W

I think your question is worth investigating. I am an aphantasic individual who also has more than average Neanderthal DNA according to 23 & me (more than 74% of their customers). In his AMA, Joel Pearson shared that a large occipital region on the brain correlated to lower visualization ability. Interestingly, it turns out that Neanderthals had much larger occipital lobes and there's research that supports that those changes are measurable in modern humans who have a higher percentage of Neanderthal DNA. There are probably other reasons for having aphantasia too but this might be part of one explanation.