以下のコメントを非表示にします。宜しいですか？　 ※一度非表示にした場合、元に戻せません。　 　コメントを非表示にした操作の一切の責任はサイト運営者が負うことはなく、非表示操作をしたユーザの責任となります。 4：(no_name)  ID:#98ba36f817    2018-08-29 00:11:06 BBC - Earth - Dogs can tell if you're untrustworthy http://www.bbc.com/earth/story/20150220-dogs-know-if-youre-untrustworthy 20 February 2015 Dogs may not seem terribly bright when they're chasing their own tails, but in many ways they are clever creatures. In particular, they are very socially aware, both of humans and of each other. Many studies have reported that they can sense human emotions. Recent research has found that they can tell the difference between happy and angry faces, and even show jealousy. It now seems that they can sense when a person is untrustworthy. Once a dog has decided a person is unreliable, it stops following the cues they give. It's been known for years that dogs understand what it means when a human points at something. If a dog's owner points to the location of a ball, stick or food, the dog will run and explore the location the person is pointing to. The latest research shows they are quick to figure out if these gestures are misleading. In a study published in the journal Animal Cognition, a team led by Akiko Takaoka of Kyoto University in Japan presented 34 dogs with three rounds of pointing. In the first round, the experimenters accurately pointed to where food was hidden in a container. But in the second round, they pointed to an empty container. In the third round, the same experimenter again pointed to the container with food. But now the dog did not respond to the experimenter's cue. That suggests, says Takaoka, that the dogs could use their experience of the experimenter to assess whether they were a reliable guide. After these rounds a new experimenter replicated the first round. Once again, the dogs followed this new person with interest.