the monkeys actually they play these video games as a kid. and when they realize they can play a game without moving at all, just standing up and staring at something and they get oranges, they start cooing. >> so this is her doing this right now? >> yeah. >> she is basically trying to put the cursor. >> she has it put the cursor inside the ball and she's just -- there, she's not doing anything but drinking juice. and controlling the cursor. of course, with her brain. we give her a sign that juice is available and look -- there she goes. fast. >> fast, huh. >> that was the biggest, i think the biggest surprise ten years ago. when the monkeys realized they can get the reward without contracting their muscles, they just stop and continue to imagine the movements they want to make and the computer will do the rest. >> do you remember the first time you saw that, where you -- >> what was it like? >> it was with our favorite