Nadeeka N W Dissanayaka1, Tiffany R Au2, Anthony J Angwin3, Kartik K Iyer2, John D O'Sullivan4, Gerard J Byrne5, Peter A Silburn6, Rodney Marsh6, George D Mellick7, David A Copland8. 1. UQ Centre for Clinical Research, Faculty of Medicine, The University of Queensland, Royal Brisbane & Women's Hospital, Herston, Brisbane QLD4029, Australia; Department of Neurology, Royal Brisbane & Women's Hospital, Herston, Brisbane QLD4029, Australia; School of Psychology, The University of Queensland, St Lucia, Brisbane QLD4067, Australia. Electronic address: n.dissanayaka@uq.edu.au. 2. UQ Centre for Clinical Research, Faculty of Medicine, The University of Queensland, Royal Brisbane & Women's Hospital, Herston, Brisbane QLD4029, Australia. 3. School of Health & Rehabilitation Sciences, The University of Queensland, St Lucia, Brisbane QLD4067, Australia. 4. UQ Centre for Clinical Research, Faculty of Medicine, The University of Queensland, Royal Brisbane & Women's Hospital, Herston, Brisbane QLD4029, Australia; Department of Neurology, Royal Brisbane & Women's Hospital, Herston, Brisbane QLD4029, Australia. 5. UQ Centre for Clinical Research, Faculty of Medicine, The University of Queensland, Royal Brisbane & Women's Hospital, Herston, Brisbane QLD4029, Australia; Mental Health Service, Royal Brisbane & Women's Hospital, Herston, Brisbane QLD4029, Australia. 6. Asia-Pacific Centre for Neuromodulation, Queensland Brain Institute, The University of Queensland, St Lucia, QLD, Brisbane QLD4067, Australia. 7. Griffith Institute for Drug Discovery, Griffith University, Nathan, Brisbane QLD4111, Australia. 8. UQ Centre for Clinical Research, Faculty of Medicine, The University of Queensland, Royal Brisbane & Women's Hospital, Herston, Brisbane QLD4029, Australia; School of Health & Rehabilitation Sciences, The University of Queensland, St Lucia, Brisbane QLD4067, Australia.
Abstract
BACKGROUND: Depression is a predominant non-motor symptom of Parkinson's disease (PD), which is often under recognised and undertreated. To improve identification of depression in PD it is imperative to examine objective brain-related markers. The present study addresses this gap by using electroencephalography (EEG) to evaluate the processing of emotionally valanced words in PD. METHODS: Fifty non-demented PD patients, unmedicated for depression or anxiety, completed an affective priming task while EEG was simultaneously recorded. Prime and target word pairs of negative or neutral valence were presented at a short 250 ms stimulus onset asynchrony. Participants were asked to evaluate the valence of the target word by button press. Depression was measured using an established rating scale. Repeated measures analysis of covariance and correlational analyses were performed to examine whether event-related potentials (ERP) varied as a function of depression scores. RESULTS: Key ERP findings reveal reduced responses in parietal midline P300, N400 and Late Positive Potential (LPP) difference waves between congruent and incongruent neutral targets in patients with higher depression scores. LIMITATIONS: Comparisons of ERPs were limited by insufficient classification of participants with and without clinical depression. A majority of PD patients who had high depression scores were excluded from the analysis as they were receiving antidepressant and/or anxiolytic medications which could interfere with ERP sensitivity. CONCLUSIONS: The present study suggests that the Pz-P300, N400 and LPP are ERP markers relates to emotional dysfunction in PD. These findings thus advance current knowledge regarding the neurophysiological markers of a common neuropsychiatric deficit in PD.
BACKGROUND:Depression is a predominant non-motor symptom of Parkinson's disease (PD), which is often under recognised and undertreated. To improve identification of depression in PD it is imperative to examine objective brain-related markers. The present study addresses this gap by using electroencephalography (EEG) to evaluate the processing of emotionally valanced words in PD. METHODS: Fifty non-demented PDpatients, unmedicated for depression or anxiety, completed an affective priming task while EEG was simultaneously recorded. Prime and target word pairs of negative or neutral valence were presented at a short 250 ms stimulus onset asynchrony. Participants were asked to evaluate the valence of the target word by button press. Depression was measured using an established rating scale. Repeated measures analysis of covariance and correlational analyses were performed to examine whether event-related potentials (ERP) varied as a function of depression scores. RESULTS: Key ERP findings reveal reduced responses in parietal midline P300, N400 and Late Positive Potential (LPP) difference waves between congruent and incongruent neutral targets in patients with higher depression scores. LIMITATIONS: Comparisons of ERPs were limited by insufficient classification of participants with and without clinical depression. A majority of PDpatients who had high depression scores were excluded from the analysis as they were receiving antidepressant and/or anxiolytic medications which could interfere with ERP sensitivity. CONCLUSIONS: The present study suggests that the Pz-P300, N400 and LPP are ERP markers relates to emotional dysfunction in PD. These findings thus advance current knowledge regarding the neurophysiological markers of a common neuropsychiatric deficit in PD.
Authors: Hind A Beydoun; Jiu-Chiuan Chen; Nazmus Saquib; Michelle J Naughton; May A Beydoun; Aladdin H Shadyab; Lauren Hale; Alan B Zonderman Journal: J Affect Disord Date: 2022-06-22 Impact factor: 6.533
Authors: Hind A Beydoun; Nazmus Saquib; Robert B Wallace; Jiu-Chiuan Chen; Mace Coday; Michelle J Naughton; May A Beydoun; Aladdin H Shadyab; Alan B Zonderman; Robert L Brunner Journal: Ann Clin Transl Neurol Date: 2022-06-24 Impact factor: 5.430
Authors: Arturo I Espinoza; Patrick May; Md Fahim Anjum; Arun Singh; Rachel C Cole; Nicholas Trapp; Soura Dasgupta; Nandakumar S Narayanan Journal: Clin Park Relat Disord Date: 2022-09-27