Human thalamus regulates cortical activity via spatially specific and structurally constrained phase-amplitude coupling

Mahsa Malekmohammadi, W. Jeff Elias, Nader Pouratian

Research output: Contribution to journalArticlepeer-review

Abstract

Although the thalamus is believed to regulate and coordinate cortical activity both within and across functional regions, such as motor and visual cortices, direct evidence for such regulation and the mechanism of regulation remains poorly described. Using simultaneous invasive recordings of cortical and thalamic electrophysiological activity in 2 awake and spontaneously behaving human subjects, we provide direct evidence of thalamic regulation of cortical activity through a mechanism of phase-amplitude coupling (PAC), in which the phase of low frequency oscillations regulates the amplitude of higher frequency oscillations. Specifically, we show that cortical PAC between the theta phase and beta amplitude is spatially dependent on and time variant with the magnitude of thalamocortical theta coherence. Moreover, using causality analysis and MR diffusion tractography, we provide evidence that thalamic theta activity drives cortical theta oscillations and PAC across structures and that these thalamocortical relationships are structurally constrained by anatomic pathways. This relationship allows for new evidence of thalamocortical PAC. Given the diffuse connectivity of the thalamus with the cerebral cortex, thalamocortical PAC may play an important role in addressing the binding problem, including both integration and segregation of information within and across cortical areas.

Original languageEnglish (US)
Pages (from-to)1618-1628
Number of pages11
JournalCerebral Cortex
Volume25
Issue number6
DOIs
StatePublished - Jun 1 2015
Externally publishedYes

Keywords

  • causality
  • diffusion tractography
  • phase-amplitude coupling (PAC)
  • thalamocortical network

ASJC Scopus subject areas

  • Cognitive Neuroscience
  • Cellular and Molecular Neuroscience

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