The scientists repeatedly showed 20 dogs half pictures - either the lower mouth region or the upper eye area - of happy or angry human faces.
科学家反复向20只狗展示半张人类的笑脸或怒容图片——要么是只有嘴的下半部分,要么是只有眼睛的上半部分。
Half the dogs received a treat when they touched an angry face with their nose. The other half were rewarded for touching happy faces.
其中一半的狗用鼻子触碰生气表情的图片时,就会得到奖励。另一半则在触碰笑脸时获得奖励。
Just over half the dogs learned the task well enough to be tested, and there were then a number of different tests to find out if they could tell the difference solely on the basis of facial expression.
仅有超过一半的狗较好地理解了这一任务,从而有能力接受测试。随后研究人员又进行了系列不同的测试,来证明它们是否能够仅靠面部表情分辨出其中的不同。
"[In one test condition], we showed them new faces - faces they've never seen before," Prof Huber told BBC News.
“(在其中一项测试条件下),我们给狗狗展示新面孔,它们之前从未见过这些人脸,”胡贝尔教授接受英国广播公司采访时说。
"In another, we showed them different parts of the faces."
“另一项测试中,我们给它们看面部的不同部分。”
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