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. 2015 May 8;9:257. doi: 10.3389/fnhum.2015.00257

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Copyright © 2015 Vosskuhl, Huster and Herrmann.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution and 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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Schematic of the theta gamma coding theory. (A) The individual theta wave (blue) carries a gamma wave (black) with phase dependent amplitude. Each gamma cycle within one theta cycle represents one item in short-term memory (STM). The maximal number of items in STM is 6 in this case. (B) During transcranial alternating current stimulation (tACS) at a frequency below the individual theta frequency (red), STM capacity is increased to 7 items. At a lower theta frequency more gamma waves fit onto each theta wave.