When the species diverged, humans managed to build on this communicative capacity by eventually graduating to speech. That ancestor probably exhibited the same early gestures, which all three species then inherited. The researchers speculate that the matching behaviors can be traced to the last shared ancestor of humans, chimps and bobonos, who lived between four and seven million years ago. The study calls this divergence in behavior вЂњthe first indication of a distinctive human pathway to language.вЂќ The apes, on the other hand, continued to rely on gestures. Eventually, the child began speaking to convey what she felt, rather than only gesturing. As she grew older, the human child began using more spoken words, while the chimpanzee and bonobo learned and used more lexigrams. They made eye contact with their caregivers, added non-verbal vocalizations to their movements or exerted physical effort to elicit a response.Д«y the second half of the experiment, the production of communicative symbols-visual ones for the apes, vocal ones for the human-increased. In the early stages of the study, the observed gestures were of a communicative nature: all three infants engaged in the behavior with the intention of conveying how their emotions and needs. Researchers filmed the childвЂ™s development for seven months, starting when she was 11 months old, while the apes were taped from 12 months of age to 26 months. The human child grew up in her familyвЂ™s home, where her parents facilitated her learning. There, Panpanzee and Panbanisha were taught to communicate with their human caregivers using gestures, noises and lexigrams, abstract symbols that represent words. The apes were raised together at the Georgia State University Language Research Center in Atlanta, where researchers study language and cognitive processes in chimps, monkeys and humans. The child stars of these videos included a chimpanzee named Panpanzee, a bonobo called Panbanisha and a human girl, identified as GN. To pick up on these behaviors, the team studied hree babies of differing species through videos taken over a number of months. Such gestures, which seemed to be innate in all three species, precede and eventually lead to the development of language in humans, the researchers say. They also raise their arms up, a motion indicating that they want to be picked up, in the same manner. Members of all three species reach with their arms and hands for objects or people, and point with their fingers or heads. Using video analysis, a team of UCLA researchers found that human, chimpanzee and bonobo babies make similar gestures when interacting with caregivers. Nonetheless, certain basic things-such as the urge to cry out in pain, an increase in blood pressure when feeling anger, even shrugging when we donвЂ™t understand something-cross cultures.ДЄ new study, published today in the journal Frontiers in Psychology, compares such involuntary responses, but with an added twist: Some observable behaviors arenвЂ™t only universal to the human species, but to our closest relatives too-chimpanzees and bonobos. This hypothesis didnвЂ™t quite pan out-last year, researchers poked a hole in the idea by showing that the expression of emotions such as anger, happiness and fear wasnвЂ™t universal (PDF). In the 1872 book The Expression of the Emotions in Man and Animals, the naturalist argued that people from different cultures exhibit any given emotion through the same facial expression. Thirteen years after the release of On the Origin of Species, Charles Darwin published another report on the evolution of mankind.

Chimpanzee hand gestures