“Women tend to be social in their behavior.They often share with others.But men tend to be competitive.They are trying to improve their social status，”said Professor Ryan.

　　Generally，people believe that the hormone exytocin is let out in our body in various social situations and our body creates a large amount of it during positive social interactions(互动)such as falling in love or giving birth.

　　our body during negative social interactions such as envy.

　　Further researches showed that in men the hormone oxytocin improves the ability to recognize competitive relationships，but in women it raises the ability to recognize friendship.

　　Professor Ryan's recent experiment used 62 men and women aged 20 to 37.

　　Half of the participants(参与者)received oxytocin.The other half received placebo(安慰剂).

　　ial.

　　Following each treatment，they were shown some video pictures with different social interactions.Then they were asked to analyze the relationships by answering some questions.The questions were about telling friendship from competition.And their answers should be based on gestures，body language and facial expressions.

　　The results indicated that，after treatment with oxytocin，men's ability to correctly recognize competitive relationships improved，but in women it was the ability to correctly recognize friendship that got better.

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