δ波 δwave
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δ波是脑电波的一个组成部分，它的持续时间长于 1／ 4秒。频率在 4Hz以下的脑电波节律称δ节律（δ rhythm）。成人的δ波只在睡眠时出现，如果非睡眠时出现，则属异常。但在幼儿非睡眠时也可出现。
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