I've been looking for the last ten minutes. Having a hell of a time finding it. The author was Dacher Keltner, it was conducted at Cal (?) in the late nineties

I've been looking for the last ten minutes. Having a hell of a time finding it. The author was Dacher Keltner, it was conducted at Cal (?) in the late nineties (?). Its nickname was the "Cookie Monster" study. I found a YouTube video where he described it [1]. But I can't find the actual study, or any citations of it. I wonder how successful attempts to replicate it have been. Couldn't find anything on that either. [1]: https://www.youtube.com/watch?v=0vvl46PmCfE https://www.youtube.com/watch?v=0vvl46PmCfE