Department of Psychology, University of Pennsylvania, Philadelphia, PA, USA.
Department of Psychology, University of Pennsylvania, Philadelphia, PA, USA.
Trends Cogn Sci. 2020 Mar;24(3):208-227. doi: 10.1016/j.tics.2019.12.006. Epub 2020 Feb 3.
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.
θ 频率（4-8 Hz）的局部场电位波动长期以来一直被认为与学习和记忆有关。然而，人类对情景记忆的研究对θ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）成功的记忆既与窄带θ振荡的增加有关，也与频谱的宽带倾斜有关；（ii）θ振荡特别支持联想记忆，而频谱倾斜反映了激活的一般指标；（iii）不同的认知对比（记忆的一般化与特定化）、记录技术（侵入性与非侵入性）和参照方案（局部与全局）改变了这两种现象之间的平衡，使得一种现象更容易被检测到。
