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新生兒獨有的奇趣現(xiàn)象 逐一解密(4)

出處：媽媽育兒網(wǎng) 日期：2015-01-13 11:58:34 編輯：Chen

怪現(xiàn)象6 睡覺時“一驚一乍”

解密：之所以會有這種現(xiàn)象是因為寶寶的大腦皮層發(fā)育還不完善，不能很好地處理外界的刺激

通常情況下，一個成熟的大腦，不僅能接收外界的信息和刺激，同時會將這種刺激傳導(dǎo)到相應(yīng)的器官進(jìn)行處理。比如我們成人聽到雷聲立即會對這種聲音做出反應(yīng)，“告訴”大腦，這是雷聲，不必太擔(dān)心。

但在大腦皮層還不完善的情況下，寶寶雖然接收了外界的刺激，卻不能很好地將這種刺激傳遞給相應(yīng)的器官并進(jìn)行處理，反而是把這種刺激“泛化”了，也就是全身的肌肉都對這種刺激做出收縮的回應(yīng)，表現(xiàn)出來就是我們看到的“一驚一乍”。

除了這個原因以外，寶寶淺睡眠的時間較長也是原因之一，淺睡眠的時候，大腦皮層更容易感知到外界的刺激，并做出全身的反應(yīng)，而成人的潛睡眠時間要明顯減少，出現(xiàn)“一驚一乍”現(xiàn)象的幾率也很少。

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