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. 2013 Dec 16;8(12):e83129. doi: 10.1371/journal.pone.0083129

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© 2013 Tsutajima et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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A. A theta oscillation integrated over 0.5 sec indicated the highest value presumably in the pyramidal layer of the hippocampus. After the first peak, the value declined towards the bottom of the stratum radiatum and then increased again.

B. Superimposition of the integrated values of the theta oscillation. The changes in the integrated values across seven independent experiments were superimposed. All of the data presented a similar pattern of peaks, and these peaks overlapped at a point that was assumed to be the CA1 pyramidal layer.