Oscillations in the human posteromedial cortex: linking canonical brain rhythms, cross-frequency coupling and slow fluctuations
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1
Department of Neurology and Neurological Sciences, Stanford University, United States
During the resting state, oscillations of differing peak frequencies predominate across the cortical surface. Also during rest, slow fluctuations of hemodynamic and electrophysiological signals correlate over large spatial scales reflecting intrinsic functional-anatomic networks. The relationship between these canonical cortical oscillations and slow fluctuations is still unclear. Using interhemispheric subdural recordings in human subjects, we explored this question by quantifying the oscillatory properties of the posteromedial cortex (PMC), the core node of the default mode network. We found that spectral power for electrodes in PMC peaked in the theta band range (4-7 Hz), which in turn showed the strongest phase-amplitude coupling with high gamma power. This cross-frequency coupling was then shown to fluctuate in magnitude at time scales comparable to those observed in functional neuroimaging studies of resting state networks (~0.01 Hz). In general, the theta band predominance and cross-frequency coupling preference was consistent across PMC and clearly distinguishable from adjacent cortical sites which displayed their own oscillatory preferences (e.g. occipital 8 Hz alpha). Together these differences of canonical oscillations across cortical sites conform to functional-anatomic boundaries and may be facilitating the interaction between networks of shared oscillatory preference. In this context, theta oscillations within the PMC likely relate to a similar theta predominance in the medial temporal lobe and other association cortical areas, given the anatomical connection of the PMC with regions important for memory and attention functions.
Keywords:
theta band,
working memory
Conference:
XI International Conference on Cognitive Neuroscience (ICON XI), Palma, Mallorca, Spain, 25 Sep - 29 Sep, 2011.
Presentation Type:
Symposium: Oral Presentation
Topic:
Symposium 18: The cognitive role of cross-frequency coupling
Citation:
Foster
BL and
Parvizi
J
(2011). Oscillations in the human posteromedial cortex: linking canonical brain rhythms, cross-frequency coupling and slow fluctuations.
Conference Abstract:
XI International Conference on Cognitive Neuroscience (ICON XI).
doi: 10.3389/conf.fnhum.2011.207.00574
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Received:
14 Nov 2011;
Published Online:
28 Nov 2011.
*
Correspondence:
Dr. Brett L Foster, Department of Neurology and Neurological Sciences, Stanford University, Stanford, United States, bfoster@bcm.edu