Why humans cry when sad?

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There are many reasons that make people cry, like a sad, troubled, upset, scared or excited. But do you know the reason behind the tears it?

A leading scientist said that the phenomenon of human emotional crying is very important. Crying even been made to communicate before people get to know the language.

Michael Trimble, a professor of English at the Institute of Neurology in London, said the tears represent something greater than simple function as an eye lubricant. In his new book "Why Humans Like To Cry ', Trimble tried to explain the mystery of why only humans the only species of the kingdom Animalia who shed tears in response to an emotional state. Trimble was doing research of physiology and evolutionary past of emotional tears.

Trimble explains, tears biologically important to protect the eyes. Tears keep the moisture eyeball, removing an irritants and contains specific proteins and substances that keep the eye in order to stay healthy and fight infection. In every other animal on the planet, tears seem to only serve the biological purposes. But in humans, cry or shed tears seem to also serve other functions, namely communicating emotions. Humans cry for many reasons, joy, sadness, anger, loss and other emotions.

"People cry for many reasons. However crying because emotional and crying to responding an aesthetic experience that appealed to us," Trimble said in Scientific American, as reported Medicaldaily, Wednesday (06/02/2013).

Trimble hopes his research will help a lot of people, especially men, to get rid of shyness when her eyes glistened with tears in public. He said that tears are a natural human response to personal suffering and feel the affection for other people. "We should not be afraid of our emotions, particularly those associated with affection, because our ability to feel empathy. And with that crying is the basis of morality and culture that is owned exclusively human," he added.

Seeing the tears from the point of view neurosciences, Trimble suggests that emotional tears have developed in humans at a certain point of evolution. In his book he says that the emergence of emotional tears must be connected to the 'self-awareness' and 'development of theory of mind'. This condition causes consciousness in ourselves and others to feel the difficulty, suffering, grief and loss.

'Emotional attachment to others, with the development of facial movements associated with pain, the loss and the grief that occurs. All this before we propositional elegant language development. Emotional responses are largely unconscious and innate, and the identification of tears as a signal for distress is important addition to the so-called 'social brain', the circuit can now be identified in the human brain, "he concluded.

Source:  Medicaldaily