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. Author manuscript; available in PMC: 2015 Oct 22.
Published in final edited form as: Neuron. 2014 Sep 25;84(2):470–485. doi: 10.1016/j.neuron.2014.08.051

Figure 4. Distribution of theta-coupled gamma oscillations along the CA1 transverse axis of the CA1 region.

Figure 4

(A) Two-dimensional distribution of the theta-coupled gamma oscillations during RUN. Each set of three panels was constructed from the GA-TF coupling of the ICA components (ICs) on each recording shank. The rad IC’s gammaS became less theta-modulated along the proximo-distal (i.e., CA3-subicular) axis, whereas lm gammaM increased in coupling strength. CA1pyr gammaF largely followed the rad IC gradient. The bar plot on the right shows group data (6 rats). Each comparison was significantly different (p < 0.001; ANOVA). (B) Similar display during REM. Note the opposite trend of CA1pyr theta-gammaF coupling along the proximo-distal axis compared to RUN. (C) Theta-phase distribution of CA1pyr gammaF power in RUN and REM at three segments along the proximo-distal axis of CA1. Note increased bimodality of the gammaF power distribution (arrowheads) toward the distal (subicular) end compared to the CA3 end (p < 0.001 for mean phases both in RUN and REM, ANOVA tests, 6 rats) and stronger overall bimodality during REM.