EEG-directed connectivity from posterior brain regions is decreased in dementia with Lewy bodies: a comparison with Alzheimer's disease and controls

Neurobiol Aging. 2016 May:41:122-129. doi: 10.1016/j.neurobiolaging.2016.02.017. Epub 2016 Feb 21.


Directed information flow between brain regions might be disrupted in dementia with Lewy bodies (DLB) and relate to the clinical syndrome of DLB. To investigate this hypothesis, resting-state electroencephalography recordings were obtained in patients with probable DLB and Alzheimer's disease (AD), and controls (N = 66 per group, matched for age and gender). Phase transfer entropy was used to measure directed connectivity in the groups for the theta, alpha, and beta frequency band. A posterior-to-anterior phase transfer entropy gradient, with occipital channels driving the frontal channels, was found in controls in all frequency bands. This posterior-to-anterior gradient was largely lost in DLB in the alpha band (p < 0.05). In the beta band, posterior brain regions were less driving in information flow in AD than in DLB and controls. In conclusion, the common posterior-to-anterior pattern of directed connectivity in controls is disturbed in DLB patients in the alpha band, and in AD patients in the beta band. Disrupted alpha band-directed connectivity may underlie the clinical syndrome of DLB and differentiate between DLB and AD.

Keywords: Alzheimer's disease; Dementia with Lewy bodies; Directed connectivity; Electroencephalography; Phase transfer entropy.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aged
  • Alzheimer Disease / diagnosis
  • Alzheimer Disease / physiopathology*
  • Brain / physiopathology*
  • Diagnosis, Differential
  • Electroencephalography*
  • Entropy
  • Female
  • Humans
  • Lewy Body Disease / diagnosis
  • Lewy Body Disease / physiopathology*
  • Male
  • Middle Aged
  • Neural Pathways / physiopathology*
  • Rest / physiology