Must be fun coming up with ways to test ideas like this: > We first got our monkeys to sit in chairs in front of a computer screen and hooked them up to electr

Must be fun coming up with ways to test ideas like this: > We first got our monkeys to sit in chairs in front of a computer screen and hooked them up to electrocardiograms to monitor their heartbeats. Then we played videos of either a yellow or green cloud bouncing up and down accompanied by beeping sounds. Sometimes we would sync the bouncing and beeping to match the monkey’s heartbeat, and at other times they were out of sync. > We then used eye trackers to measure how long the monkeys looked at the images. If the monkeys had a sense of their own heartbeats, they would find the in-sync bouncing less interesting and novel than the out-of-sync bouncing and so would spend more time looking at the out-of-sync image. I wonder if you could get them to tap along or similar to a sensor that was beeping to their heart beat where you made the beep quieter and quieter until eventually silent.