Evolutionary gestures, gestures, and the use of the agreement with the sign are older than our orphan. Both humans and other primates use facial expressions to give social signs.
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What is more important is that non-human primates are more dependent on this function than ours, since their verbal signs and communication capacities are much more limited than those of us. Even monkeys are quite adept at recognizing face and facial expressions.
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People perform better on human faces and monkeys perform better to differentiate monkey faces. In a study conducted in humans, babies have better results than adults in terms of their ability to distinguish ape faces.
This result shows that the perceptional windows of babies are wider in terms of this capacity and that this wide perceptual window is narrowed because people are in contact with other human faces visually in the community life.
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