Squids In?

Scientists have reportedly (and with great difficulty) got cuttlefish to wear 3D-glasses in a mini aquatic cinema, showing shrimp movies, in an attempt to determine how they judge distance to make a strike with their tentacles (https://www.theguardian.com/science/2020/jan/08/scientists-play-shrimp-films-to-cuttlefish-in-3d-vision-study). The starting point seemed to be that it couldn't be as simple as the stereopsis technique (relying on the slightly different images from the left and right eyes) used by humans and other mammals. The study appears to show that they do use stereopsis but that the information is processed rather differently in the mollusc's brain.