Robert Sapol­sky, Pro­fes­sor of Biol­o­gy at Stan­ford Uni­ver­si­ty, famous­ly focus­es his research on stress above all else. (Don’t miss his book, Why Zebras Don’t Get Ulcers.) The video above fea­tures Sapol­sky pre­sent­ing the Pritzk­er Lec­ture at the Cal­i­for­nia Acad­e­my of Sci­ences on Feb­ru­ary 15, 2011. The full lec­ture can be seen here. In this excerpt, Sapol­sky amus­ing­ly tells the audi­ence how mon­keys and humans com­mon­ly gen­er­ate the high­est lev­els of dopamine when plea­sure is antic­i­pat­ed, not when plea­sure is actu­al­ly expe­ri­enced. But humans, as opposed to mon­keys, can “keep those dopamine lev­els up for decades and decades wait­ing for the reward.” And for some, Sapol­sky adds, that per­ceived reward lies beyond this life – in the after­life. (Sapol­sky was raised in an ortho­dox Jew­ish fam­i­ly, but is an athe­ist now.) The Stan­ford pro­fes­sor talks about sim­i­lar issues (what sep­a­rates us from pri­mates) in anoth­er cap­ti­vat­ing talk, “What makes us human?”

By pro­fes­sion, Matthias Rasch­er teach­es Eng­lish and His­to­ry at a High School in north­ern Bavaria, Ger­many. In his free time he scours the web for good links and posts the best finds on Twit­ter.