Doesn't seem very surprising. It's a common assertion that males are better with spatial tasks in order to make them better at hunting while women are better at

Doesn't seem very surprising. It's a common assertion that males are better with spatial tasks in order to make them better at hunting while women are better at color detection to make them better at gathering and identifying things like ripe fruit when gathering. It's pretty common to see certain animals that have very little color capability, but good motion detection. This is just a hormonal switch for that, which makes sense, if genders were once indicative of roles. It doesn't seem to far off from visual input to encourage shade detection vs. motion detection.