Decrease of Delta Oscillatory Responses in Cognitively Normal Parkinson's Disease


EMEK SAVAŞ D. D., Ozmus G., Guntekin B., DÖNMEZ ÇOLAKOĞLU B., ÇAKMUR R., BAŞAR E., ...More

CLINICAL EEG AND NEUROSCIENCE, vol.48, no.5, pp.355-364, 2017 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 48 Issue: 5
  • Publication Date: 2017
  • Doi Number: 10.1177/1550059416666718
  • Journal Name: CLINICAL EEG AND NEUROSCIENCE
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.355-364
  • Keywords: Parkinson's disease, event-related oscillations, sensory-evoked oscillations, P300, VISUAL-EVOKED-POTENTIALS, EVENT-RELATED POTENTIALS, SOCIETY TASK-FORCE, ALZHEIMERS-DISEASE, PATTERN ELECTRORETINOGRAM, DIAGNOSTIC-CRITERIA, CEREBRAL ATROPHY, REACTION-TIME, ODDBALL TASK, LEWY BODIES
  • Dokuz Eylül University Affiliated: Yes

Abstract

Parkinson's disease (PD) is a common progressive neurodegenerative disorder. This study aims to compare sensory-evoked oscillations (SEOs) and event-related oscillations (EROs) of visual modality in cognitively normal PD patients and healthy controls. Sixteen PD and 16 age-, gender-, and education-matched healthy controls participated in the study. A simple flashlight was used for SEO and a classical visual oddball paradigm was used for target ERO. Oscillatory responses in the delta frequency range (0.5-3.5 Hz) were examined. Significantly lower delta ERO and SEO responses were found in PD patients than healthy controls. Delta ERO responses were decreased at all frontal, central and parietal locations, whereas delta SEO responses were decreased over mid and right central locations in PD. According to the notion that SEO reflects the activity of sensory networks and ERO reflects cognitive networks, these findings indicate that PD patients have impairments in both cognitive and sensory networks of visual modality. Decreased delta ERO responses indicate that the subliminal cognitive changes in PD can be detected by electrophysiological methods. These results demonstrate that brain oscillatory responses have the potential to be studied as a biomarker for visual cognitive and sensory networks in PD.