Thanks - missed that part

How do they know there wasn’t a trading system back then though?

Kangaroo tends to either be really good or really bad, nothing in between. Probably down to the quality of the chef, hence why I never cook it at home

Crocodile can be a bit hit and miss. Supposedly ‘tastes just like chicken’ but there was an extra flavour I can’t describe.

Basically they’re seeing slower speech overall: “Instead, overall reaction time – the raw speed of pulling any word – stood out as the best indicator. The finding nudged attention back toward general processing speed.”

Near the bottom of this article it mentions that WFD isn’t the thing, but instead reaction time. Either way this does require an expert opinion