In the case of giving people to look at subtly-distorted images and asking them "truck-vs-cat" and "chair-vs-sheep", I think it's likely people thought: "Huh, I guess one of those involves artificially constructed angles and the other tends to organic rounded bits, so I'll decide on which seems extra-present."

To me that seems a reasonable--and not very exciting--explanation for why humans may get similar this-or-that answers to a machine-vision model.