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The Relationship between Visual-Evoked Potential and Optic Coherence Tomography and Clinical Findings in Parkinson Patients. PARKINSON'S DISEASE 2023; 2023:7739944. [PMID: 36873294 PMCID: PMC9981293 DOI: 10.1155/2023/7739944] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/10/2021] [Revised: 12/14/2022] [Accepted: 01/18/2023] [Indexed: 02/25/2023]
Abstract
Background In Parkinson's disease (PD), dopamine deficiency is present not only in the nigrostriatal pathway but also in the retinal and visual pathways. Optic coherence tomography (OCT) can be used as morphological evidence of visual influence from early nonmotor symptoms. The aim of this study was to investigate the relationship of OCT and visual evoked potentials (VEPs) of eyes with the severity of clinical findings and ocular findings in PD. Methods A group of 42 patients diagnosed with idiopathic PD and a control group of 29 people between the ages of 45-85 were included in our study. VEP was recorded in the patient and control groups. OCT measurement was made with the Optovue spectral-domain device. Foveal thickness and macular volume were measured in the foveal region and in the parafoveal and perifoveal regions in the temporal, superior, nasal, and inferior quadrants. RNFL (retinal nerve fiber layer) was measured in temporal, superior, nasal, and inferior quadrants. Ganglion cell complex (GCC) was evaluated in the superior and inferior quadrants. Using the UPDRS clinical scale, the relationship between measurements and the differences between the control group and the patient group were evaluated. Results Among the OCT values in our study, foveal, parafoveal, perifoveal thickness, macular volume, RNFL, and GCC measurements were performed for the right and left eyes, and no difference was found between the patient group and the control group. There was no difference in VEP amplitude and latency values between the patient and control groups. The relationships between UPDRS and modified Hoehn Yahr staging and OCT and VEP measurements in the patient revealed no correlation. Conclusions Studies on whether OCT measurements can functionally be a marker or which segments are more valuable for disease progression in patients with PD are needed. Visual dysfunction in PD cannot be attributed only to retinal pathology; however, the retina may provide monitoring of the status of dopaminergic neurodegeneration and axonal loss in PD.
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Hünerli D, Emek-Savaş DD, Çavuşoğlu B, Dönmez Çolakoğlu B, Ada E, Yener GG. Mild cognitive impairment in Parkinson’s disease is associated with decreased P300 amplitude and reduced putamen volume. Clin Neurophysiol 2019; 130:1208-1217. [DOI: 10.1016/j.clinph.2019.04.314] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2019] [Revised: 03/18/2019] [Accepted: 04/22/2019] [Indexed: 12/28/2022]
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Merola A, Sturchio A, Hacker S, Serna S, Vizcarra JA, Marsili L, Fasano A, Espay AJ. Technology-based assessment of motor and nonmotor phenomena in Parkinson disease. Expert Rev Neurother 2018; 18:825-845. [PMID: 30269610 DOI: 10.1080/14737175.2018.1530593] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
INTRODUCTION The increasing development and availability of portable and wearable technologies is rapidly expanding the field of technology-based objective measures (TOMs) in neurological disorders, including Parkinson disease (PD). Substantial challenges remain in the recognition of disease phenomena relevant to patients and clinicians, as well as in the identification of the most appropriate devices to carry out these measurements. Areas covered: The authors systematically reviewed PubMed for studies employing technology as outcome measures in the assessment of PD-associated motor and nonmotor abnormalities. Expert commentary: TOMs minimize intra- and inter-rater variability in clinical assessments of motor and nonmotor phenomena in PD, improving the accuracy of clinical endpoints. Critical unmet needs for the integration of TOMs into clinical and research practice are the identification and validation of relevant endpoints for individual patients, the capture of motor and nonmotor activities from an ecologically valid environment, the integration of various sensor data into an open-access, common-language platforms, and the definition of a regulatory pathway for approval of TOMs. The current lack of multidomain, multisensor, smart technologies to measure in real time a wide scope of relevant changes remain a significant limitation for the integration of technology into the assessment of PD motor and nonmotor functional disability.
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Affiliation(s)
- Aristide Merola
- a James J and Joan A Gardner Family Center for Parkinson's Disease and Movement Disorders, Department of Neurology , University of Cincinnati , Cincinnati , OH , USA
| | - Andrea Sturchio
- a James J and Joan A Gardner Family Center for Parkinson's Disease and Movement Disorders, Department of Neurology , University of Cincinnati , Cincinnati , OH , USA
| | - Stephanie Hacker
- a James J and Joan A Gardner Family Center for Parkinson's Disease and Movement Disorders, Department of Neurology , University of Cincinnati , Cincinnati , OH , USA
| | - Santiago Serna
- a James J and Joan A Gardner Family Center for Parkinson's Disease and Movement Disorders, Department of Neurology , University of Cincinnati , Cincinnati , OH , USA
| | - Joaquin A Vizcarra
- a James J and Joan A Gardner Family Center for Parkinson's Disease and Movement Disorders, Department of Neurology , University of Cincinnati , Cincinnati , OH , USA
| | - Luca Marsili
- a James J and Joan A Gardner Family Center for Parkinson's Disease and Movement Disorders, Department of Neurology , University of Cincinnati , Cincinnati , OH , USA
| | - Alfonso Fasano
- b Edmond J. Safra Program in Parkinson's disease and the Morton and Gloria Shulman Movement Disorders Clinic , Toronto Western Hospital, University of Toronto; Krembil Brain Institute , Toronto , ON , Canada
| | - Alberto J Espay
- a James J and Joan A Gardner Family Center for Parkinson's Disease and Movement Disorders, Department of Neurology , University of Cincinnati , Cincinnati , OH , USA
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He SB, Liu CY, Chen LD, Ye ZN, Zhang YP, Tang WG, Wang BD, Gao X. Meta-Analysis of Visual Evoked Potential and Parkinson's Disease. PARKINSON'S DISEASE 2018; 2018:3201308. [PMID: 30123489 PMCID: PMC6079328 DOI: 10.1155/2018/3201308] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/21/2018] [Revised: 05/20/2018] [Accepted: 06/03/2018] [Indexed: 11/18/2022]
Abstract
BACKGROUND Previous studies suggested that visual evoked potential (VEP) was impaired in patients with Parkinson's disease (PD), but the results were inconsistent. METHODS We conducted a systematic review and meta-analysis to explore whether the VEP was significantly different between PD patients and healthy controls. Case-control studies of PD were selected through an electronic search of the databases PubMed, Embase, and the Cochrane Central Register of Controlled Trials. We calculated the pooled weighted mean differences (WMDs) and 95% confidence intervals (CIs) between individuals with PD and controls using the random-effects model. RESULTS Twenty case-control studies which met our inclusion criteria were included in the final meta-analysis. We found that the P100 latency in PD was significantly higher compared with healthy controls (pooled WMD = 6.04, 95% CI: 2.73 to 9.35, P=0.0003, n=20). However, the difference in the mean amplitude of P100 was not significant between the two groups (pooled WMD = 0.64, 95% CI: -0.06 to 1.33, P=0.07) based on 10 studies with the P100 amplitude values available. CONCLUSIONS The higher P100 latency of VEP was observed in PD patients, relative to healthy controls. Our findings suggest that electrophysiological changes and functional defect in the visual pathway of PD patients are important to our understanding of the pathophysiology of visual involvement in PD.
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Affiliation(s)
- Song-bin He
- Department of Neurology, Zhoushan Hospital, Wenzhou Medical University, Zhoushan 316021, China
| | - Chun-yan Liu
- Department of Critical Care Medicine, Huzhou Central Hospital, Huzhou 313000, China
| | - Lin-di Chen
- Department of Neurology, Zhoushan Hospital, Wenzhou Medical University, Zhoushan 316021, China
| | - Zhi-nan Ye
- Department of Neurology, Taizhou Municipal Hospital, Taizhou 318000, China
| | - Ya-ping Zhang
- Department of Neurology, Taizhou Municipal Hospital, Taizhou 318000, China
| | - Wei-guo Tang
- Department of Neurology, Zhoushan Hospital, Wenzhou Medical University, Zhoushan 316021, China
| | - Bin-da Wang
- Department of Neurology, Zhoushan Hospital, Wenzhou Medical University, Zhoushan 316021, China
| | - Xiang Gao
- Department of Nutritional Sciences, The Pennsylvania State University, USA
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Emek-Savaş DD, Özmüş G, Güntekin B, Dönmez Çolakoğlu B, Çakmur R, Başar E, Yener GG. Decrease of Delta Oscillatory Responses in Cognitively Normal Parkinson's Disease. Clin EEG Neurosci 2017; 48:355-364. [PMID: 27582502 DOI: 10.1177/1550059416666718] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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.
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Affiliation(s)
- Derya Durusu Emek-Savaş
- 1 Department of Psychology, Dokuz Eylül University, Izmir, Turkey.,2 Department of Neurosciences, Dokuz Eylül University, Izmir, Turkey
| | - Gülin Özmüş
- 2 Department of Neurosciences, Dokuz Eylül University, Izmir, Turkey
| | - Bahar Güntekin
- 3 Department of Biophysics, Istanbul Medipol University, Istanbul, Turkey
| | | | - Raif Çakmur
- 4 Department of Neurology, Dokuz Eylül University Medical School, Izmir, Turkey.,5 Brain Dynamics Multidisciplinary Research Center, Dokuz Eylül University, Izmir, Turkey
| | - Erol Başar
- 6 Brain Dynamics, Cognition and Complex Systems Research Center, Istanbul Kultur University, Istanbul, Turkey
| | - Görsev G Yener
- 2 Department of Neurosciences, Dokuz Eylül University, Izmir, Turkey.,4 Department of Neurology, Dokuz Eylül University Medical School, Izmir, Turkey.,5 Brain Dynamics Multidisciplinary Research Center, Dokuz Eylül University, Izmir, Turkey.,6 Brain Dynamics, Cognition and Complex Systems Research Center, Istanbul Kultur University, Istanbul, Turkey.,7 Izmir International Biomedicine and Genome Institute, Dokuz Eylül University Health Campus, Izmir, Turkey
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Event-related potentials and cognition in Parkinson’s disease: An integrative review. Neurosci Biobehav Rev 2016; 71:691-714. [DOI: 10.1016/j.neubiorev.2016.08.003] [Citation(s) in RCA: 67] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2016] [Revised: 06/30/2016] [Accepted: 08/02/2016] [Indexed: 12/14/2022]
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Weintraub D, Simuni T, Caspell-Garcia C, Coffey C, Lasch S, Siderowf A, Aarsland D, Barone P, Burn D, Chahine LM, Eberling J, Espay AJ, Foster ED, Leverenz JB, Litvan I, Richard I, Troyer MD, Hawkins KA. Cognitive performance and neuropsychiatric symptoms in early, untreated Parkinson's disease. Mov Disord 2015; 30:919-27. [PMID: 25737166 PMCID: PMC4855523 DOI: 10.1002/mds.26170] [Citation(s) in RCA: 212] [Impact Index Per Article: 23.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2014] [Revised: 10/22/2014] [Accepted: 12/17/2014] [Indexed: 12/13/2022] Open
Abstract
UNLABELLED This study was undertaken to determine the prevalence and correlates of cognitive impairment (CI) and neuropsychiatric symptoms (NPS) in early, untreated patients with Parkinson's disease (PD). BACKGROUND Both CI and NPS are common in PD and impact disease course and quality of life. However, limited knowledge is available about cognitive abilities and NPS. METHODS Parkinson's Progression Markers Initiative (PPMI) is a multi-site study of early, untreated PD patients and healthy controls (HCs), the latter with normal cognition. At baseline, participants were assessed with a neuropsychological battery and for symptoms of depression, anxiety, impulse control disorders (ICDs), psychosis, and apathy. RESULTS Baseline data of 423 PD patients and 196 HCs yielded no between-group differences in demographic characteristics. Twenty-two percent of PD patients met the PD-recommended screening cutoff for CI on the Montral Cognitive Assessment (MoCA), but only 9% met detailed neuropsychological testing criteria for mild cognitive impairment (MCI)-level impairment. The PD patients were more depressed than HCs (P < 0.001), with twice as many (14% vs. 7%) meeting criteria for clinically significant depressive symptoms. The PD patients also experienced more anxiety (P < 0.001) and apathy (P < 0.001) than HCs. Psychosis was uncommon in PD (3%), and no between-group difference was seen in ICD symptoms (P = 0.51). CONCLUSIONS Approximately 10% of PD patients in the early, untreated disease state met traditional criteria of CI, which is a lower frequency compared with previous studies. Multiple dopaminergic-dependent NPS are also more common in these patients compared with the general population, but others associated with dopamine replacement therapy are not or are rare. Future analyses of this cohort will examine biological predictors and the course of CI and NPS. © 2015 International Parkinson and Movement Disorder Society.
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Affiliation(s)
- Daniel Weintraub
- Departments of Psychiatry and Neurology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, USA; Philadelphia Veterans Affairs Medical Center, Philadelphia, Pennsylvania, USA
| | - Tanya Simuni
- Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA
| | - Chelsea Caspell-Garcia
- Department of Biostatistics, College of Public Health, University of Iowa, Iowa City, Iowa, USA
| | - Christopher Coffey
- Department of Biostatistics, College of Public Health, University of Iowa, Iowa City, Iowa, USA
| | - Shirley Lasch
- Institute for Neurodegenerative Disorders (IND) and Molecular NeuroImaging, LLC (MNI), New Haven, Connecticut, USA
| | | | - Dag Aarsland
- Department of Neurobiology, Care Sciences and Society and the Alzheimer Disease Research Centre, Karolinska Institutet, Stockholm, Sweden; Centre for Age-Related Medicine, Stavanger University Hospital, Stavanger, Norway
| | - Paolo Barone
- Neurodegenerative Diseases Centre, Neuroscience Section, Department of Medicine, University of Salerno, Italy
| | - David Burn
- Institute for Ageing and Health, Newcastle University, Newcastle, England
| | - Lama M. Chahine
- Department of Neurology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Jamie Eberling
- Michael J. Fox Foundation for Parkinson’s Research, New York, New York, USA
| | - Alberto J. Espay
- Department of Neurology, University of Cincinnati Academic Health Center, Cincinnati, Ohio, USA
| | - Eric D. Foster
- Department of Biostatistics, College of Public Health, University of Iowa, Iowa City, Iowa, USA
| | - James B. Leverenz
- Lou Ruvo Center for Brain Health, Cleveland Clinic, Cleveland, Ohio, USA
| | - Irene Litvan
- UCSD Movement Disorder Center, Department of Neurosciences, University of California San Diego, San Diego, California, USA
| | - Irene Richard
- Departments of Neurology and Psychiatry, University of Rochester School of Medicine and Dentistry, Rochester, New York, USA
| | | | - Keith A. Hawkins
- Department of Psychiatry, Yale School of Medicine, New Haven, Connecticut, USA
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Foveal vision is impaired in Parkinson's disease. Parkinsonism Relat Disord 2013; 19:1-14. [DOI: 10.1016/j.parkreldis.2012.07.012] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/06/2010] [Revised: 07/16/2012] [Accepted: 07/21/2012] [Indexed: 11/23/2022]
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Bodis-Wollner I. Current aspects of cognitive neurophysiology of Parkinson disease: an introduction. Clin EEG Neurosci 2010; 41:68-75. [PMID: 20521488 DOI: 10.1177/155005941004100205] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Parkinson Disease (PD) is the second most common neurodegenerative disorder after Alzheimer's disease. With increased longevity and improved health care, our society is experiencing an unprecedented challenge posed by neurodegenerative disorders. Alzheimer's disease alone is now the third most expensive disease to treat in the U.S., costing close to $100 billion annually. While treatment of the motor manifestations of PD has advanced much, the treatment of its non-motor features, in particular mental dysfunction remain as unresolved problems in PD. Electrophysiological and imaging studies in this issue are providing new information on the roles of the frontal cortex, pedunculopontine nucleus, dopaminergic mesolimbic system and thalamocortical circuits on cognitive and mental dysfunction in PD.
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Affiliation(s)
- Ivan Bodis-Wollner
- Department of Neurology, State University of New York, Brooklyn, New York 11203, USA.
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Nagel F, Bähr M, Dietz GPH. Tyrosine hydroxylase-positive amacrine interneurons in the mouse retina are resistant against the application of various parkinsonian toxins. Brain Res Bull 2009; 79:303-9. [PMID: 19406215 DOI: 10.1016/j.brainresbull.2009.04.010] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2008] [Revised: 04/20/2009] [Accepted: 04/20/2009] [Indexed: 11/18/2022]
Abstract
Toxins such as 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP), 6-hydroxydopamine (6-OHDA), or rotenone have been used to induce degeneration of dopaminergic (DA) neurons in the nigrostriatal pathway and to reproduce pathological characteristics of Parkinson's disease (PD). DA neurons are also present in the retina, and visual impairments in PD patients have been reported. We examined the vulnerability of TH-positive (TH(+)) amacrine interneurons in the retina against MPTP, 6-OHDA, or rotenone-induced cell death. We intraperitoneally (i.p.) injected mice with MPTP, which induced degeneration of DA neurons in the midbrain. However, no death of TH(+) amacrine cells was detectable in the same mice. HPLC analysis revealed a 9 times lower level of the toxic metabolite of MPTP, MPP(+), in the eye compared with the striatum. Another membrane-permeable compound (Tat-Hsp70) could be delivered into the retina after i.p. application, suggesting that the blood-retina barrier (BRB) could be overcome after systemic application. Possible reason for the survival of retinal amacrine cells after systemic MPTP application was a less efficient conversion into toxic MPP(+) in the retina or a general higher resistance against toxic insults of retinal DA neurons compared with DA neurons in the substantia nigra pars compacta (SNpc). Therefore, we directly injected high doses of MPP(+), 6-OHDA, or rotenone into the eye. No loss of TH(+) amacrine cells in the retina was observed, suggesting different properties and less vulnerability of amacrine neurons compared with DA neurons in the midbrain.
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Affiliation(s)
- Florian Nagel
- Department of Neurology, Georg-August-Universität Göttingen, Waldweg 33, 37073 Göttingen, Germany
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11
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Visual information processing in recently abstaining methamphetamine-dependent individuals: evoked potentials study. Doc Ophthalmol 2008; 117:245-55. [DOI: 10.1007/s10633-008-9135-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2008] [Accepted: 06/03/2008] [Indexed: 10/21/2022]
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Visual and auditory event-related potential comparisons between Parkinson's disease with dementia and Alzheimer's disease. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/j.ics.2004.11.064] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Chapter 25 Visual dysfunction in disorders with altered dopaminergic neurotransmission. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/s1567-4231(09)70222-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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Abstract
Neuropsychiatric, perceptual and cognitive deficits are increasingly recognized as non-motor manifestations of Parkinson's Disease (PD).The premorbid personality profile of PD patients is characterized by a number of traits which figure prominently after the disease becomes manifest. In particular, less novelty seeking is one premorbid trait providing an understanding of later cognitive deficits. Anxiety and depression have been shown to precede in some patients motor manifestations and cannot be attributed to anti-parkinsonian therapy. Some neuropsychiatric manifestations and in particular hallucinosis are linked to select perceptual and cognitive changes. Cognitive deficits are common in PD, in particular in younger onset patients. Current animal studies link genetic differences in the dopamine transporter and dopamine catabolic enzyme system to select cognitive impairments attributed to frontal lobe dysfunction.Visuo-cognitive impairment is prevalent in PD. Retinal dopaminergic deficiency has been shown in patients and in the animal model of PD. Visuo-spatial deficits, however, are not simply passive reflections of retinal deficiency. In addition to vision, saccadic eye movements are affected in PD whether they contribute to visuo-spatial dysfunction is unknown. However, recent functional Magnetic Resonance Imaging (fMRI) and electroencephalogram (EEG) studies show an essential role of the occipital cortex in saccadic eye movements and positron emission tomography (PET) studies show occipital hypometabolism in PD. Visual and eye movement studies suggest that certain neuropsychiatric and cognitive deficits in PD are linked to the visual system. Synchrony of signals are essential for the co-operation of distributed neuronal network engaged in sensory-motor coordination. Local, dopaminergic neuronal groups in the retina, basal ganglia and frontal cortical memory system are affected in PD. These connections may not primarily rely on dopamine as a neurotransmitter. It is suggested that to understand visuocognitive changes we should consider pathology affecting neuronal connections, necessary for binding parallel distributed networks.
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Affiliation(s)
- Ivan Bodis-Wollner
- Downstate Medical Centre, State University of New York, Kings County Hospital Center and SUNY, 450 Clarkson Avenue, Box 1213 Brooklyn, NY 11203, USA.
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Antal A, Kéri S, Dibó G, Benedek G, Janka Z, Vécsei L, Bodis-Wollner I. Electrophysiological correlates of visual categorization: evidence for cognitive dysfunctions in early Parkinson's disease. BRAIN RESEARCH. COGNITIVE BRAIN RESEARCH 2002; 13:153-8. [PMID: 11958957 DOI: 10.1016/s0926-6410(01)00090-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Our aim was to examine the electrophysiological correlates of perceptual categorization in Parkinson's disease (PD). We recorded visual event-related potentials (ERPs) in a natural scene categorization task in drug naive idiopathic PD patients and healthy control subjects. In the control group, there was a significant early difference (150-250 ms poststimulus) between ERPs elicited by pictures containing animals and scenes without animals. In spite of relatively preserved basic-level visual functions, this was not observable in the PD group. These results raise the possibility for striatal contributions to visual categorization and may provide a novel protocol for further clinical studies.
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Affiliation(s)
- Andrea Antal
- Department of Physiology, University of Szeged, Faculty of Medicine, Szeged, Hungary.
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Wang L, Kuroiwa Y, Kamitani T. Visual event-related potential changes at two different tasks in nondemented Parkinson's disease. J Neurol Sci 1999; 164:139-47. [PMID: 10402025 DOI: 10.1016/s0022-510x(99)00060-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A visual oddball paradigm and an S1-S2 paradigm were employed to evoke event-related potentials (ERPs) in 38 nondemented Parkinson's disease (PD) patients and 24 healthy elderly subjects. Delayed N200 and reduced P300 amplitude in the whole PD sample were only found in the S1-S2 paradigm. Delayed N200 and reaction time in PD with short duration of illness were found only after the S1-S2 paradigm, which might be an early sign of cognitive changes in PD. This is the first study to apply an S1-S2 paradigm for a visual P300 test in PD and proved the value of this paradigm for detecting minor cognitive abnormalities. ERP changes were correlated with clinical features. Reduced P300 amplitude for the S1-S2 paradigm was significantly correlated with WAIS-R scores and gait disturbance. The correlation between P300 amplitude and clinical scores has rarely been discussed before. P300 latency during the oddball paradigm in PD was influenced by age at test, age at onset, and duration of illness. This may explain why P300 results in nondemented PD have varied among previous authors.
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Affiliation(s)
- L Wang
- Department of Neurology, Yokohama City University School of Medicine, Yokohama, Japan
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Sohn YH, Kim GW, Huh K, Kim JS. Dopaminergic influences on the P300 abnormality in Parkinson's disease. J Neurol Sci 1998; 158:83-7. [PMID: 9667783 DOI: 10.1016/s0022-510x(98)00102-6] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
This study was designed to evaluate the contribution of central dopaminergic mechanisms to the P300 event-related potential (P300) abnormality in Parkinson's disease. We measured the P300 in 37 non-demented patients with Parkinson's disease (19 de novo and 18 levodopa-treated) and 15 age-matched healthy volunteers. The P300 measurement was repeated in 14 de novo patients, after 6-12 months levodopa therapy. The severity of parkinsonian symptom was assessed using the UPDRS-motor scale. De novo patients showed prolonged P300 latency compared with levodopa-treated patients, as well as healthy volunteers. The levodopa therapy for 6-12 months significantly shortened the P300 latency and reduced the UPDRS-motor examination score in de novo patients. However, the percent changes in the P300 latency were not correlated with those in the UPDRS-motor examination score. These results indicate that the central dopaminergic mechanisms apart from those responsible for motor symptoms, may contribute to the P300 abnormality in Parkinson's disease.
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Affiliation(s)
- Y H Sohn
- Department of Neurology and the Brain Research Institute, Yonsei University College of Medicine, Seoul, Korea
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