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Simply grew. up so it's a matter of a couple of hours a couple of days weeks of months to systematically. to call ect observations into our computers and analyze the. mark. of his managed to decode the facial expressions displayed by great apes. which facial expressions are associated with play with fear and with fear take his behavior. to one of the expressions that he identified as the play face. relaxed open mouth expression and expression that's reminiscent of human laughter. yeah the small one hits the big one. this couldn't be serious of course both of them showing a beautiful play face ...

Long before a child learns how to talk. and the way they laugh out only individual style of laughter seems to be in. identical twins often have identical learned even when they're raised. you know more you know you're. always the primal stimulus for human laughter in fact my candidate for the most joke is saying turkle would be like i'm going to get you i'm going to get you it's the only joke that you can tell both with chimpanzee and a human baby. here

They're raised. you know more you know you're not. always the primal stimulus for human laughter in fact my candidate for the most ancient joke is saying turkle would be like i'm going to get you i'm going to get you it's the only joke that you can tell both with chimpanzee and a human baby. here is. all very juvenile love being tickled by a caretaker who has a very close relationship with that girl and that is very important. of course they

Revealed that all of the sticking vocalisations came from the same evolutionary origin which indicates that all of these folks lose ations of the great apes are laugh oh please it's so therefore we could trace back the evolution of laughter it should be at least ten to six million years. that turns out that studying the transition from primate to human laughter now we told you how other primates are different than us but also explains why we can talk to other apes care here's a case where laughter can be used as a tool of the study vocal evolution. the key event. human vocal evolution turns ou...

About right after than we know. but human laughter at least in the brain. it's just. when a rat laughs it's not audible to the human ear the rat emits a series of high frequency chuckles in the range of fifty kilo heads to hear a rattle off punk's it uses an ultrasound detector tests. we can stimulate after. stimulating specific parts of the brain. and every place you stimuli that you get a rat laughter which is country church did you choose the animal likes it the animal will turn on the stimulation themselves so now we know some positive emotions are. from. jason how is this any more church ...