A recent study by American scientists show that monkeys can display self-doubt in the same way as humans. These monkeys seemed to know when they were not sure they would make a correct choice. The test showed these results with Old World monkeys, but not with New World monkeys, who are more distantly related to humans. The scientists state that expressing self-doubt is proof of self awareness.
I cannot say for sure, because I have no scientific study to back me up, but I believe dogs can display self-doubt too. I think I know when I am not sure I will make the right choice, which I sometimes do when I am given commands by Paula or Daniel. Perhaps there will be future studies on this as well.
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