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Theta/gamma nested oscillations form a neural code:

An item is represented in working memory by firing within a gamma cycle; different items are represented in their order at different discrete phasises of a theta cycle.

  1. Storage of 7 +/- 2 short-term memories in oscillatory subcycles. Lisman JE, Idiart MA. Science. 1995 Mar 10; 267 (5203): 1512-5. PDF format ]

  2. Gating of human theta oscillations by a working memory task. Raghavachari S, Kahana MJ, Rizzuto DS, Caplan JB, Kirschen MP, Bourgeois B, Madsen JR, Lisman JE. J Neurosci. 2001 May 1;21(9):3175-83 [ PDF format ]

  3. The theta/gamma discrete phase code occuring during the hippocampal phase precession may be a more general brain coding scheme. Lisman J. Hippocampus. 2005; 15(7): 913-22. [ PDF format ]

  4. Theta oscillations in human cortex during a working-memory task: evidence for local generators. Raghavachari S, Lisman JE, Tully M, Madsen JR, Bromfield EB, Kahana MJ. J. Nurophysiol. 2006 Mar; 95(3): 1630-8. [ PDF format ]

 

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