Theta frequency (4-8 Hz) fluctuations of the local field potential have long been implicated in learning and memory. Human studies of episodic memory, however, have provided mixed evidence for theta's role in successful learning and remembering. Re-evaluating these conflicting findings leads us to conclude that: (i) successful memory is associated both with increased narrow-band theta oscillations and a broad-band tilt of the power spectrum; (ii) theta oscillations specifically support associative memory, whereas the spectral tilt reflects a general index of activation; and (iii) different cognitive contrasts (generalized versus specific to memory), recording techniques (invasive versus noninvasive), and referencing schemes (local versus global) alter the balance between the two phenomena to make one or the other more easily detectable.

中文翻译：

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人类记忆中的 Theta 振荡

局部场电位的 Theta 频率（4-8 Hz）波动长期以来一直与学习和记忆有关。然而，人类对情景记忆的研究为西塔在成功学习和记忆中的作用提供了混合的证据。重新评估这些相互矛盾的发现使我们得出结论：（i）成功的记忆与窄带 theta 振荡的增加和功率谱的宽带倾斜有关；(ii) Theta 振荡特别支持联想记忆，而频谱倾斜则反映一般的激活指数；(iii)不同的认知对比（广义记忆与特定记忆）、记录技术（侵入性与非侵入性）和参考方案（局部与全局）改变了两种现象之间的平衡，使其中一种或另一种更容易被察觉。