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. 2013 Aug 30;7:43. doi: 10.3389/fnsys.2013.00043

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Copyright © 2013 Hoffman, Dragan, Leonard, Micheli, Montefusco-Siegmund and Valiante.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Time-frequency spectrogram of hippocampal activity aligned to fixation onset during visual search, grand averaged across each patient. Frequency was measured from 3 to 80 Hz at 1 Hz intervals, time was measured in 800 ms Hanning-tapered windows, shifted every 10 ms. For visualization of each frequency band, power is presented in each band relative to the average seen for that frequency band between ±800 ms around fixation onset. None of the hippocampal recording sites showed theta power modulation, though some exhibited modulation in higher frequency bands.