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Yang J, McMahon KL, Copland DA, Pourzinal D, Byrne GJ, Angwin AJ, O'Sullivan JD, Dissanayaka NN. Semantic fluency deficits and associated brain activity in Parkinson's disease with mild cognitive impairment. Brain Imaging Behav 2022; 16:2445-2456. [PMID: 35841523 DOI: 10.1007/s11682-022-00698-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Revised: 06/03/2022] [Accepted: 06/06/2022] [Indexed: 11/26/2022]
Abstract
People living with Parkinson's disease (PD) with poor verbal fluency have an increased risk of developing dementia. This study examines the neural mechanisms underpinning semantic fluency deficits in patients with PD with mild cognitive impairment (PD-MCI) compared to those without MCI (PD-NC) and control participants without PD (non-PD). Thirty-seven (37) participants with PD completed a cognitive assessment battery to identify MCI (13 PD-MCI). Twenty sex- and age-matched non-PD patients also participated. Participants were scanned (3T Siemens PRISMA) while performing semantic fluency, semantic switching, and automatic speech tasks. The number of responses and fMRI data for semantic generation and semantic switching were analyzed. Participants also completed a series of verbal fluency tests outside the scanner, including letter fluency. Participants with PD-MCI performed significantly worse than PD-NC and non-PD participants during semantic fluency and semantic switching tasks. PD-MCI patients showed greater activity in the right angular gyrus than PD-NC and non-PD patients during semantic switching. Increased right angular activity correlated with worse verbal fluency performance outside the scanner. Our study showed that the PD-MCI group performed worse on semantic fluency than either the PD-NC or non-PD groups. Increased right angular gyrus activity in participants with PD-MCI during semantic switching suggests early compensatory mechanisms, predicting the risk of future dementia in PD.
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Affiliation(s)
- Jihyun Yang
- UQ Centre for Clinical Research, Faculty of Medicine, The University of Queensland, Herston, Queensland, Australia
| | - Katie L McMahon
- School of Clinical Sciences and Centre for Biomedical Technologies, Queensland University of Technology, Brisbane, Queensland, Australia
| | - David A Copland
- UQ Centre for Clinical Research, Faculty of Medicine, The University of Queensland, Herston, Queensland, Australia
- School of Health & Rehabilitation Sciences, The University of Queensland, St Lucia, Queensland, Australia
| | - Dana Pourzinal
- UQ Centre for Clinical Research, Faculty of Medicine, The University of Queensland, Herston, Queensland, Australia
| | - Gerard J Byrne
- UQ Centre for Clinical Research, Faculty of Medicine, The University of Queensland, Herston, Queensland, Australia
- Mental Health Service, Royal Brisbane & Women's Hospital, Herston, Queensland, Australia
| | - Anthony J Angwin
- School of Health & Rehabilitation Sciences, The University of Queensland, St Lucia, Queensland, Australia
| | - John D O'Sullivan
- UQ Centre for Clinical Research, Faculty of Medicine, The University of Queensland, Herston, Queensland, Australia
- Department of Neurology, Royal Brisbane & Women's Hospital, Herston Queensland, Australia
| | - Nadeeka N Dissanayaka
- UQ Centre for Clinical Research, Faculty of Medicine, The University of Queensland, Herston, Queensland, Australia.
- Department of Neurology, Royal Brisbane & Women's Hospital, Herston Queensland, Australia.
- School of Psychology, The University of Queensland, St Lucia, Queensland, Australia.
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fMRI Investigation of Semantic Lexical Processing in Healthy Control and Alzheimer's Disease Subjects Using Naming Task: A Preliminary Study. Brain Sci 2021; 11:brainsci11060718. [PMID: 34071377 PMCID: PMC8226532 DOI: 10.3390/brainsci11060718] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2021] [Revised: 05/25/2021] [Accepted: 05/25/2021] [Indexed: 11/17/2022] Open
Abstract
For decades, scientists have been trying to solve the problem of dementia, with no cure currently available. Semantic-lexical impairment is well established as the early critical sign of dementia, although there are still gaps in knowledge that must be investigated. In this study, we used fMRI to observe the neural activity of 31 subjects, including 16 HC (Healthy Control) and 15 AD (Alzheimer's Disease), who participated in the naming task. The neuropsychology profile of HC (Healthy Control) and AD (Alzheimer's Disease) are discussed in this study. The involvement of FG (Fusiform Gyrus) and IFG (Inferior Frontal Gyrus) shows dominant activation in both of the groups. We observed a decrease in neural activity in the AD group, resulting in semantic deficit problems in this preliminary study. Furthermore, ROI analysis was performed and revealed both hyperactivation and hypoactivation in the AD group. The compensatory mechanism demonstrated during the task, due to the effort required to identify an animal's name, represents the character profile of AD.
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Schnellbächer GJ, Hoffstaedter F, Eickhoff SB, Caspers S, Nickl-Jockschat T, Fox PT, Laird AR, Schulz JB, Reetz K, Dogan I. Functional Characterization of Atrophy Patterns Related to Cognitive Impairment. Front Neurol 2020; 11:18. [PMID: 32038473 PMCID: PMC6993791 DOI: 10.3389/fneur.2020.00018] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Accepted: 01/08/2020] [Indexed: 12/12/2022] Open
Abstract
Introduction: Mild cognitive impairment (MCI) is a heterogenous syndrome considered as a risk factor for developing dementia. Previous work examining morphological brain changes in MCI has identified a temporo-parietal atrophy pattern that suggests a common neuroanatomical denominator of cognitive impairment. Using functional connectivity analyses of structurally affected regions in MCI, we aimed to investigate and characterize functional networks formed by these regions that appear to be particularly vulnerable to disease-related disruptions. Methods: Areas of convergent atrophy in MCI were derived from a quantitative meta-analysis and encompassed left and right medial temporal (i.e., hippocampus, amygdala), as well as parietal regions (precuneus), which were defined as seed regions for connectivity analyses. Both task-based meta-analytical connectivity modeling (MACM) based on the BrainMap database and task-free resting-state functional MRI in a large cohort of older adults from the 1000BRAINS study were applied. We additionally assessed behavioral characteristics associated with the seed regions using BrainMap meta-data and investigated correlations of resting-state connectivity with age. Results: The left temporal seed showed stronger associations with a fronto-temporal network, whereas the right temporal atrophy cluster was more linked to cortico-striatal regions. In accordance with this, behavioral analysis indicated an emphasis of the left temporal seed on language generation, and the right temporal seed was associated with the domains of emotion and attention. Task-independent co-activation was more pronounced in the parietal seed, which demonstrated stronger connectivity with a frontoparietal network and associations with introspection and social cognition. Correlation analysis revealed both decreasing and increasing functional connectivity with higher age that may add to pathological processes but also indicates compensatory mechanisms of functional reorganization with increasing age. Conclusion: Our findings provide an important pathophysiological link between morphological changes and the clinical relevance of major structural damage in MCI. Multimodal analysis of functional networks related to areas of MCI-typical atrophy may help to explain cognitive decline and behavioral alterations not tractable by a mere anatomical interpretation and therefore contribute to prognostic evaluations.
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Affiliation(s)
| | - Felix Hoffstaedter
- Research Centre Jülich, Institute of Neuroscience and Medicine (INM-1, INM-7, INM-11), Jülich, Germany.,Institute of Systems Neuroscience, Medical Faculty, Heinrich Heine University, Düsseldorf, Germany
| | - Simon B Eickhoff
- Research Centre Jülich, Institute of Neuroscience and Medicine (INM-1, INM-7, INM-11), Jülich, Germany.,Institute of Systems Neuroscience, Medical Faculty, Heinrich Heine University, Düsseldorf, Germany
| | - Svenja Caspers
- Research Centre Jülich, Institute of Neuroscience and Medicine (INM-1, INM-7, INM-11), Jülich, Germany.,Institute for Anatomy I, Medical Faculty, Heinrich Heine University, Düsseldorf, Germany.,JARA-BRAIN, Jülich-Aachen Research Alliance, Jülich, Germany
| | - Thomas Nickl-Jockschat
- Iowa Neuroscience Institute, Carver College of Medicine, University of Iowa, Iowa City, IA, United States.,Department of Psychiatry, Carver College of Medicine, University of Iowa, Iowa City, IA, United States
| | - Peter T Fox
- Research Imaging Center, University of Texas Health Science Center, San Antonio, TX, United States.,Research Service, South Texas Veterans Administration Medical Center, San Antonio, TX, United States
| | - Angela R Laird
- Department of Physics, Florida International University, Miami, FL, United States
| | - Jörg B Schulz
- Department of Neurology, RWTH Aachen University, Aachen, Germany.,Research Centre Jülich, Institute of Neuroscience and Medicine (INM-1, INM-7, INM-11), Jülich, Germany.,JARA-BRAIN, Jülich-Aachen Research Alliance, Jülich, Germany
| | - Kathrin Reetz
- Department of Neurology, RWTH Aachen University, Aachen, Germany.,Research Centre Jülich, Institute of Neuroscience and Medicine (INM-1, INM-7, INM-11), Jülich, Germany.,JARA-BRAIN, Jülich-Aachen Research Alliance, Jülich, Germany
| | - Imis Dogan
- Department of Neurology, RWTH Aachen University, Aachen, Germany.,Research Centre Jülich, Institute of Neuroscience and Medicine (INM-1, INM-7, INM-11), Jülich, Germany.,JARA-BRAIN, Jülich-Aachen Research Alliance, Jülich, Germany
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Roheger M, Kalbe E, Liepelt-Scarfone I. Progression of Cognitive Decline in Parkinson's Disease. JOURNAL OF PARKINSONS DISEASE 2019; 8:183-193. [PMID: 29914040 PMCID: PMC6004891 DOI: 10.3233/jpd-181306] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Background: Cognitive dysfunction is one of the most prevalent non-motor symptoms in Parkinson’s disease (PD), often experienced as more debilitating for patients and caregivers than motor problems. Therefore, a deeper understanding of the course of cognitive decline and the identification of valid progression markers for Parkinson’s disease dementia (PDD) is essential. Objective: This systematic review summarizes the current state of knowledge on cognitive decline over time by reporting effect sizes of cognitive changes in neuropsychological tests. METHODS: 1368 studies were identified by a PubMed database search and 25 studies by additionally scanning previous literature. After screening all records, including 69 full-text article reviews, 12 longitudinal studies on the progression of cognitive decline in PD met our criteria (e.g., sample size ≥50 patients). Results: Only a few studies monitored cognitive decline over a longer period (>4 years). Most studies focused on the evaluation of change in global cognitive state by use of the Mini-Mental State Examination, whereas the use of neuropsychological tests was highly heterogenic among studies. Only one study evaluated patients’ cognitive performance in all specified domains (executive function, attention & working memory, memory, language, and visual-spatial function) allowing for diagnosis of cognitive impairment according to consensus guidelines. Medium to strong effect sizes could only be observed in studies with follow-up intervals of four years or longer. Conclusions: The results emphasize the need for the assessment of larger PD cohorts over longer periods of follow-up with a comprehensive neuropsychological battery.
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Affiliation(s)
- Mandy Roheger
- Medical Psychology I Neuropsychology and Gender Studies and Center for Neuropsychological Diagnostics and Intervention (CeNDI), University Hospital Cologne, Köln, Germany
| | - Elke Kalbe
- Medical Psychology I Neuropsychology and Gender Studies and Center for Neuropsychological Diagnostics and Intervention (CeNDI), University Hospital Cologne, Köln, Germany
| | - Inga Liepelt-Scarfone
- German Center for Neurodegenerative Diseases (DZNE), University of Tübingen, Tübingen, Germany.,Department of Neurodegenerative Diseases, Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany
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Hessen E, Stav AL, Auning E, Selnes P, Blomsø L, Holmeide CE, Johansen KK, Eliassen CF, Reinvang I, Fladby T, Aarsland D. Neuropsychological Profiles in Mild Cognitive Impairment due to Alzheimer's and Parkinson's Diseases. JOURNAL OF PARKINSONS DISEASE 2017; 6:413-21. [PMID: 27061068 PMCID: PMC4927809 DOI: 10.3233/jpd-150761] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Background: Neuropsychological comparisons between patients with mild cognitive impairment due to Parkinson’s disease (MCI-PD) and Alzheimer’s disease (MCI-AD) is mostly based on indirect comparison of patients with these disorders and normal controls (NC). Objective: The focus of this study was to make a direct comparison between patients with these diseases. Methods: The study compared 13 patients with MCI-PD and 19 patients with MCI-AD with similar age, education and gender. The participants were recruited and assessed at the same university clinic with equal methods. Results: The main finding was that on group level, MCI-AD scored significantly poorer on learning and memory tests than MCI-PD, whereas MCI-PD were impaired on 1 of 3 measures of executive functioning. Conclusion: MCI-AD performed poorer learning and memory tests, whereas MCI-PD only scored below the employed cut-off on one single executive test. In general, MCI-PD was noticeably less cognitively impaired than MCI-AD.
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Affiliation(s)
- Erik Hessen
- Department of Neurology, Akershus University Hospital, Lorenskog, Norway.,Department of Psychology, University of Oslo, Norway
| | - Ane Løvli Stav
- Department of Neurology, Akershus University Hospital, Lorenskog, Norway
| | - Eirik Auning
- Department of Geriatric Psychiatry, Akershus University Hospital, Lorenskog, Norway
| | - Per Selnes
- Department of Neurology, Akershus University Hospital, Lorenskog, Norway
| | - Linn Blomsø
- Department of Psychology, University of Oslo, Norway
| | | | | | - Carl Fredrik Eliassen
- Department of Neurology, Akershus University Hospital, Lorenskog, Norway.,Department of Psychology, University of Oslo, Norway
| | - Ivar Reinvang
- Department of Psychology, University of Oslo, Norway
| | - Tormod Fladby
- Department of Neurology, Akershus University Hospital, Lorenskog, Norway.,Institute of Clinical Medicine, Campus Ahus, University of Oslo, Norway
| | - Dag Aarsland
- Alzheimer's Disease Research Centre, Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, Novum, Stockholm, Sweden.,Center for Age-Related Diseases, Stavanger University Hospital, Stavanger, Norway
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