But in a previous experiment Professor Ryan found that the hormone is also let out in 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)．

　　After a week，the two groups switched with participants.They went through the same procedure with the other material.

　　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，mens ability to correctly recognize competitive relationships improved，but in women it was the ability to correctly recognize friendship that got better.

　　Professor Ryan thus concluded：“Our experiment proves that the hormone oxytocin can raise peoples abilities to better distinguish different social interactions.And the behavior differences between men and women are caused by biological factors(因素)that are mainly hormonal.”

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