Differential changes in visual and auditory event-related oscillations in dementia with Lewy bodies

Yevgenia Rosenblum, Inbal Maidan, Firas Fahoum, Nir Giladi, Noa Bregman, Tamara Shiner, Anat Mirelman

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Objective: Aside from the cognitive impairment, patients with dementia with Lewy bodies (DLB) have a high frequency of visual hallucinations and a number of other vision-related symptoms, whereas auditory hallucinations are less frequent. To better understand the differential dysfunction of the visual network in DLB, we compared auditory and visual event-related potentials and oscillations in patients with DLB. Methods: Event-related potentials elicited by visual and auditory oddball tasks were recorded in 23 patients with DLB and 22 healthy controls and analyzed in time and time-frequency domain. Results: DLB patients had decreased theta band activity related to both early sensory and later cognitive processing in the visual, but not in the auditory task. Patients had lower delta and higher alpha and beta bands power related to later cognitive processing in both auditory and visual tasks. Conclusions: In DLB visual event-related oscillations are characterized by a decrease in theta and lack of inhibition in alpha bands. Significance: Decreased theta and a lack of inhibition in alpha band power might be an oscillatory underpinning of some classical DLB symptoms such as fluctuations in attention and high-level visual disturbances and a potential marker of dysfunction of the visual system in DLB.

Original languageEnglish
Pages (from-to)2357-2366
Number of pages10
JournalClinical Neurophysiology
Volume131
Issue number10
DOIs
StatePublished - 1 Oct 2020
Externally publishedYes

Keywords

  • Dementia with Lewy bodies
  • Event-related EEG oscillations
  • Time-frequency power
  • Visual impairment
  • Visual\auditory oddball P3 (P300)

ASJC Scopus subject areas

  • Sensory Systems
  • Neurology
  • Clinical Neurology
  • Physiology (medical)

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