This was a MRI-derived information about brain size in connection with cognitive performance test results
By examining a large dataset of reviews from Amazon.com, the researchers were able to build a statistical model of how people should choose products.
The study included 243 males who were randomly selected to receive a dose of testosterone gel or placebo gel before taking a cognitive reflection test.
Participants played a game for 5 minutes in which they, as their avatars, were tasked with fighting enemies. Then, in a presumably unrelated study, they participated in a blind taste test.