Evolution of facial expressions

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It is well known that irreducible complexity is a key test for evolution because evolution is limited to step-by-step change. When we see irreducible complexity in nature this provides very strong evidence that life was specially created and not evolved. However, irreducible complexity is not the only design test for evolution.

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The human obsession with emojiand the sheer number of them available on your phone, may have its origins in 6 million years of evolution. Moreover, the shape and lack of hair on our faces seems to have evolved very specifically so that humans could convey a range of expressions, setting us apart from other hominids and even most other animals on Earth. That means the minute differences in emoji expressions — and your instant inability to recognize the emotions they represent — are the byproduct of 6 million years of evolution.

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It reviews the scientific history of emotion perception and the evolutionary origins and functions of facial expression. It includes an updated compilation on the great debate around Basic Emotion Theory versus Behavioral Ecology and Psychological constructionism. The developmental psychology and social psychology of facial expressions is explored in the role of facial expressions in child development, social interactions, and culture.

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The study of the evolution of emotions dates back to the 19th century. Evolution and natural selection has been applied to the study of human communicationmainly by Charles Darwin in his work, The Expression of the Emotions in Man and Animals. He proposed that much like other traits found in animals, emotions also evolved and were adapted over time.

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Use the link below to share a full-text version of this article with your friends and colleagues. Learn more. The importance of the face in social interaction and social intelligence is widely recognized in anthropology.

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Skip to search form Skip to main content. Human facial expressions as adaptations: Evolutionary questions in facial expression research. Yet the adaptive functions of human facial expression remain largely unknown.

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Charles Darwin is famous for his prolific writing about biology. In addition to publishing his theory of evolutionDarwin wrote books about coral reefs, earthworms and carnivorous plants. But the eminent naturalist made important contributions to more than just the life sciences.

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Mobile eyebrows and other expressive features that allow us to communicate without words may have helped shape the human face, experts have claimed. Scientists set out to investigate why the faces of people living today are so different from those of extinct members of the human family, as well as our great ape cousins. They concluded that, alongside diet and climate, non-verbal social communication played an important but overlooked role. In contrast, modern humans have evolved a smooth forehead with more visible, hairy, eyebrows capable of a large range of movement.

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Competent social organisms will read the social signals of their peers. In primates, the face has evolved to transmit the organism's internal emotional state. Adaptive action suggests that the brain of the receiver has co-evolved to efficiently decode expression signals.

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One of the common ways of human showing emotion is through the change in facial expression. In this paper, we propose a new method for emotion detection by analyzing facial expression images. The proposed algorithm is able to automatically recognize seven basic emotions that include Anger, Contempt, Disgust, Fear, Happiness, Sadness and Surprise.

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