随后,在这些鸟睡眠时,戴夫和马格赖许再一次观察其脑内相同部位的电流活动。这些神经细胞的活动并不是完全随机的。相反,这些神经细胞在有秩序地活动,就像这些鸟把歌曲一个音符一个音符地唱出声来一样。这可能说明,斑胸草雀在睡眠中也在练习唱歌。
Does the behaviour of cats in science experiments actually qualify as dreaming? Do rats have any subjective awareness that they're running their mazes in their minds while they nap? Do the songbirds realise that they're singing in their sleep? These questions are as hard to answer as the question of consciousness. It's tricky. We humans do not usually realise we're dreaming while we're dreaming, but it becomes clear as soon as we wake up. Do zebra finches remember their dreams as dreams when they're shaken out of their sleep? Can they distinguish the real world from the one in their dreams? We can say with a reasonable amount of certainty that the physiological and behavioural features of dreaming in humans have now been observed in cats, rats, birds, and other animals. Yet what it’s actually like to experience a dream if you’re not human remains a mystery.
科学实验中猫的行为表现是否可看作是真正在做梦呢?对于睡眠时脑内在迷宫中奔跑的状态,老鼠自身有客观意识吗?这些唱歌的鸟又是否意识到自己在睡眠中唱歌呢?这些问题和与意识相关的问题一样难以回答。这很棘手。我们人类在做梦时通常都不能意识到自己是在做梦,但是在醒来后就能马上清楚地意识到这件事。那么,斑胸草雀从梦中醒来后是否记得自己的梦呢?它们能把现实世界和梦境区分开吗?我们可以非常确定地说,如今在猫、鼠、鸟等动物中都能观察到与人类相同的做梦时的身体行为特征。然而,非人类在做梦时是怎样的感觉,这依然是个谜。
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