51
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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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Wang P, Zhang H, Han L, Zhou Y. Cortical function in Alzheimer's disease and frontotemporal dementia. Transl Neurosci 2016; 7:116-125. [PMID: 28123831 PMCID: PMC5234521 DOI: 10.1515/tnsci-2016-0018] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2016] [Accepted: 07/12/2016] [Indexed: 11/24/2022] Open
Abstract
Objectives Alzheimer’s disease (AD) and the behavioral variant of frontotemporal dementia (bvFTD) are the most common causes of dementia; however, their overlapping clinical syndromes and involved brain regions make a differential diagnosis difficult. We aimed to identify the differences in the cognition and motor cortex excitability between AD and bvFTD patients. Methods Twenty-seven AD patients and 30 bvFTD patients were included in the study. Each participant received a neurological evaluation. Cognitive event-related potentials (P300) were recorded during an auditory oddball task. Next, the excitability of the motor cortex, including the resting, facilitated motor threshold (RMT and FMT) and cortical silent period (CSP), were assessed during transcranial magnetic stimulation (TMS). Results The bvFTD patients exhibited significantly longer P300 latencies compared with AD patients. There was a significant negative correlation between cognition and P300 latency in the bvFTD group. The AD patients showed significantly reduced RMT and FMT values compared to the bvFTD group; however, no significant correlation was found between AD severity and the excitability of the motor cortex. Conclusions Cognition and motor cortical functions are different between AD and bvFTD patients. Noninvasive electrophysiological examinations have the potential to identify unique pathophysiological features that can be used to differentially diagnose AD and bvFTD patients.
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Affiliation(s)
- Pan Wang
- Department of Neurology, Tianjin Huanhu Hospital, Tianjin, 300060, P.R. China
| | - Huihong Zhang
- Department of Neurology, Tianjin Huanhu Hospital, Tianjin, 300060, P.R. China
| | - Lu Han
- Department of electrophysiology, Tianjin Huanhu Hospital, Tianjin, 300060, P.R. China
| | - Yuying Zhou
- Department of Neurology, Tianjin Huanhu Hospital, Tianjin, 300060, P.R. China
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Boeijinga PH. Multimodal EEG Recordings, Psychometrics and Behavioural Analysis. Neuropsychobiology 2016; 72:206-18. [PMID: 26901154 DOI: 10.1159/000437434] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/26/2015] [Accepted: 07/06/2015] [Indexed: 11/19/2022]
Abstract
High spatial and temporal resolution measurements of neuronal activity are preferably combined. In an overview on how this approach can take shape, multimodal electroencephalography (EEG) is treated in 2 main parts: by experiments without a task and in the experimentally cued working brain. It concentrates first on the alpha rhythm properties and next on data-driven search for patterns such as the default mode network. The high-resolution volumic distributions of neuronal metabolic indices result in distributed cortical regions and possibly relate to numerous nuclei, observable in a non-invasive manner in the central nervous system of humans. The second part deals with paradigms in which nowadays assessment of target-related networks can align level-dependent blood oxygenation, electrical responses and behaviour, taking the temporal resolution advantages of event-related potentials. Evidence-based electrical propagation in serial tasks during performance is now to a large extent attributed to interconnected pathways, particularly chronometry-dependent ones, throughout a chain including a dorsal stream, next ventral cortical areas taking the flow of information towards inferior temporal domains. The influence of aging is documented, and results of the first multimodal studies in neuropharmacology are consistent. Finally a scope on implementation of advanced clinical applications and personalized marker strategies in neuropsychiatry is indicated.
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Chiang HS, Mudar RA, Pudhiyidath A, Spence JS, Womack KB, Cullum CM, Tanner JA, Eroh J, Kraut MA, Hart J. Altered Neural Activity during Semantic Object Memory Retrieval in Amnestic Mild Cognitive Impairment as Measured by Event-Related Potentials. J Alzheimers Dis 2016; 46:703-17. [PMID: 25835419 DOI: 10.3233/jad-142781] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Deficits in semantic memory in individuals with amnestic mild cognitive impairment (aMCI) have been previously reported, but the underlying neurobiological mechanisms remain to be clarified. We examined event-related potentials (ERPs) associated with semantic memory retrieval in 16 individuals with aMCI as compared to 17 normal controls using the Semantic Object Retrieval Task (EEG SORT). In this task, subjects judged whether pairs of words (object features) elicited retrieval of an object (retrieval trials) or not (non-retrieval trials). Behavioral findings revealed that aMCI subjects had lower accuracy scores and marginally longer reaction time compared to controls. We used a multivariate analytical technique (STAT-PCA) to investigate similarities and differences in ERPs between aMCI and control groups. STAT-PCA revealed a left fronto-temporal component starting at around 750 ms post-stimulus in both groups. However, unlike controls, aMCI subjects showed an increase in the frontal-parietal scalp potential that distinguished retrieval from non-retrieval trials between 950 and 1050 ms post-stimulus negatively correlated with the performance on the logical memory subtest of the Wechsler Memory Scale-III. Thus, individuals with aMCI were not only impaired in their behavioral performance on SORT relative to controls, but also displayed alteration in the corresponding ERPs. The altered neural activity in aMCI compared to controls suggests a more sustained and effortful search during object memory retrieval, which may be a potential marker indicating disease processes at the pre-dementia stage.
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Affiliation(s)
- Hsueh-Sheng Chiang
- Center for BrainHealth, The University of Texas at Dallas, Dallas, TX, USA.,School of Behavioral and Brain Sciences, The University of Texas at Dallas, Richardson, TX, USA
| | - Raksha A Mudar
- Center for BrainHealth, The University of Texas at Dallas, Dallas, TX, USA.,School of Behavioral and Brain Sciences, The University of Texas at Dallas, Richardson, TX, USA.,Department of Speech and Hearing Science, University of Illinois at Urbana-Champaign, Champaign, IL, USA
| | - Athula Pudhiyidath
- Center for BrainHealth, The University of Texas at Dallas, Dallas, TX, USA
| | - Jeffrey S Spence
- Center for BrainHealth, The University of Texas at Dallas, Dallas, TX, USA
| | - Kyle B Womack
- Center for BrainHealth, The University of Texas at Dallas, Dallas, TX, USA.,Department of Neurology and Neurotherapeutics, The University of Texas Southwestern Medical Center, Dallas, TX, USA.,Department of Psychiatry, The University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - C Munro Cullum
- Department of Neurology and Neurotherapeutics, The University of Texas Southwestern Medical Center, Dallas, TX, USA.,Department of Psychiatry, The University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Jeremy A Tanner
- The Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Justin Eroh
- Center for BrainHealth, The University of Texas at Dallas, Dallas, TX, USA.,School of Behavioral and Brain Sciences, The University of Texas at Dallas, Richardson, TX, USA
| | - Michael A Kraut
- Department of Radiology, The Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - John Hart
- Center for BrainHealth, The University of Texas at Dallas, Dallas, TX, USA.,School of Behavioral and Brain Sciences, The University of Texas at Dallas, Richardson, TX, USA.,Department of Neurology and Neurotherapeutics, The University of Texas Southwestern Medical Center, Dallas, TX, USA.,Department of Psychiatry, The University of Texas Southwestern Medical Center, Dallas, TX, USA
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55
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Huang X, Yang JC, Chang R, Guo C. Task modulation of disyllabic spoken word recognition in Mandarin Chinese: a unimodal ERP study. Sci Rep 2016; 6:25916. [PMID: 27180951 PMCID: PMC4867628 DOI: 10.1038/srep25916] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Accepted: 04/25/2016] [Indexed: 11/09/2022] Open
Abstract
Using unimodal auditory tasks of word-matching and meaning-matching, this study investigated how the phonological and semantic processes in Chinese disyllabic spoken word recognition are modulated by top-down mechanism induced by experimental tasks. Both semantic similarity and word-initial phonological similarity between the primes and targets were manipulated. Results showed that at early stage of recognition (~150-250 ms), an enhanced P2 was elicited by the word-initial phonological mismatch in both tasks. In ~300-500 ms, a fronto-central negative component was elicited by word-initial phonological similarities in the word-matching task, while a parietal negativity was elicited by semantically unrelated primes in the meaning-matching task, indicating that both the semantic and phonological processes can be involved in this time window, depending on the task requirements. In the late stage (~500-700 ms), a centro-parietal Late N400 was elicited in both tasks, but with a larger effect in the meaning-matching task than in the word-matching task. This finding suggests that the semantic representation of the spoken words can be activated automatically in the late stage of recognition, even when semantic processing is not required. However, the magnitude of the semantic activation is modulated by task requirements.
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Affiliation(s)
- Xianjun Huang
- Beijing Key Laboratory of Learning and Cognition and Department of Psychology, Capital Normal University, Beijing, China
| | - Jin-Chen Yang
- Center for Mind and Brain, University of California Davis, Davis, CA, USA.,Department of Neurology, University of California Davis, School of Medicine, Sacramento, CA, USA
| | - Ruohan Chang
- Beijing Key Laboratory of Learning and Cognition and Department of Psychology, Capital Normal University, Beijing, China.,Institute of Psychology, Chinese Academy of Sciences, Beijing, China
| | - Chunyan Guo
- Beijing Key Laboratory of Learning and Cognition and Department of Psychology, Capital Normal University, Beijing, China
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Chapman RM, Gardner MN, Mapstone M, Klorman R, Porsteinsson AP, Dupree HM, Antonsdottir IM, Kamalyan L. ERP C250 shows the elderly (cognitively normal, Alzheimer's disease) store more stimuli in short-term memory than Young Adults do. Clin Neurophysiol 2016; 127:2423-35. [PMID: 27178862 DOI: 10.1016/j.clinph.2016.03.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2014] [Revised: 02/15/2016] [Accepted: 03/04/2016] [Indexed: 01/12/2023]
Abstract
OBJECTIVE To determine how aging and dementia affect the brain's initial storing of task-relevant and irrelevant information in short-term memory. METHODS We used brain Event-Related Potentials (ERPs) to measure short-term memory storage (ERP component C250) in 36 Young Adults, 36 Normal Elderly, and 36 early-stage AD subjects. Participants performed the Number-Letter task, a cognitive paradigm requiring memory storage of a first relevant stimulus to compare it with a second stimulus. RESULTS In Young Adults, C250 was more positive for the first task-relevant stimulus compared to all other stimuli. C250 in Normal Elderly and AD subjects was roughly the same to relevant and irrelevant stimuli in Intratrial Parts 1-3 but not 4. The AD group had lower C250 to relevant stimuli in part 1. CONCLUSIONS Both normal aging and dementia cause less differentiation of relevant from irrelevant information in initial storage. There was a large aging effect involving differences in the pattern of C250 responses of the Young Adult versus the Normal Elderly/AD groups. Also, a potential dementia effect was obtained. SIGNIFICANCE C250 is a candidate tool for measuring short-term memory performance on a biological level, as well as a potential marker for memory changes due to normal aging and dementia.
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Affiliation(s)
- Robert M Chapman
- Department of Brain and Cognitive Sciences and Center for Visual Science at the University of Rochester, Rochester, NY 14627, United States.
| | - Margaret N Gardner
- Department of Brain and Cognitive Sciences and Center for Visual Science at the University of Rochester, Rochester, NY 14627, United States
| | - Mark Mapstone
- Department of Neurology, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642, United States
| | - Rafael Klorman
- Department of Clinical and Social Sciences in Psychology at the University of Rochester, Rochester, NY 14627, United States
| | - Anton P Porsteinsson
- Department of Psychiatry, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642, United States
| | - Haley M Dupree
- Department of Brain and Cognitive Sciences and Center for Visual Science at the University of Rochester, Rochester, NY 14627, United States
| | - Inga M Antonsdottir
- Department of Brain and Cognitive Sciences and Center for Visual Science at the University of Rochester, Rochester, NY 14627, United States
| | - Lily Kamalyan
- Department of Brain and Cognitive Sciences and Center for Visual Science at the University of Rochester, Rochester, NY 14627, United States
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Mudar RA, Chiang HS, Eroh J, Nguyen LT, Maguire MJ, Spence JS, Kung F, Kraut MA, Hart J. The Effects of Amnestic Mild Cognitive Impairment on Go/NoGo Semantic Categorization Task Performance and Event-Related Potentials. J Alzheimers Dis 2016; 50:577-90. [DOI: 10.3233/jad-150586] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Raksha A. Mudar
- Department of Speech and Hearing Science, University of Illinois at Urbana-Champaign, Champaign, IL, USA
- Neuroscience Program, University of Illinois at Urbana-Champaign, Champaign, IL, USA
- Center for BrainHealth, The University of Texas at Dallas, Dallas, TX, USA
| | - Hsueh-Sheng Chiang
- Center for BrainHealth, The University of Texas at Dallas, Dallas, TX, USA
| | - Justin Eroh
- Center for BrainHealth, The University of Texas at Dallas, Dallas, TX, USA
| | - Lydia T. Nguyen
- Neuroscience Program, University of Illinois at Urbana-Champaign, Champaign, IL, USA
| | - Mandy J. Maguire
- Center for BrainHealth, The University of Texas at Dallas, Dallas, TX, USA
| | - Jeffrey S. Spence
- Center for BrainHealth, The University of Texas at Dallas, Dallas, TX, USA
| | - Fanting Kung
- Department of Speech and Hearing Science, University of Illinois at Urbana-Champaign, Champaign, IL, USA
| | - Michael A. Kraut
- Department of Radiology, The Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - John Hart
- Center for BrainHealth, The University of Texas at Dallas, Dallas, TX, USA
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The time course of lexical competition during spoken word recognition in Mandarin Chinese: an event-related potential study. Neuroreport 2016; 27:67-72. [PMID: 26619230 DOI: 10.1097/wnr.0000000000000492] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
The present study investigated the effect of lexical competition on the time course of spoken word recognition in Mandarin Chinese using a unimodal auditory priming paradigm. Two kinds of competitive environments were designed. In one session (session 1), only the unrelated and the identical primes were presented before the target words. In the other session (session 2), besides the two conditions in session 1, the target words were also preceded by the cohort primes that have the same initial syllables as the targets. Behavioral results showed an inhibitory effect of the cohort competitors (primes) on target word recognition. The event-related potential results showed that the spoken word recognition processing in the middle and late latency windows is modulated by whether the phonologically related competitors are presented or not. Specifically, preceding activation of the competitors can induce direct competitions between multiple candidate words and lead to increased processing difficulties, primarily at the word disambiguation and selection stage during Mandarin Chinese spoken word recognition. The current study provided both behavioral and electrophysiological evidences for the lexical competition effect among the candidate words during spoken word recognition.
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Hedges D, Janis R, Mickelson S, Keith C, Bennett D, Brown BL. P300 Amplitude in Alzheimer's Disease: A Meta-Analysis and Meta-Regression. Clin EEG Neurosci 2016; 47:48-55. [PMID: 25253434 DOI: 10.1177/1550059414550567] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/11/2014] [Accepted: 08/12/2014] [Indexed: 11/16/2022]
Abstract
Alzheimer's disease accounts for 60% of all dementia. Numerous biomarkers have been developed that can help in making an early diagnosis. The P300 is an event-related potential that may be abnormal in Alzheimer's disease. Given the possible association between P300 amplitude and Alzheimer's disease and the need for biomarkers in early Alzheimer's disease, the main purpose of this meta-analysis and meta-regression was to characterize P300 amplitude in probable Alzheimer's disease compared to healthy controls. Using online search engines, we identified peer-reviewed articles containing amplitude measures for the P300 in response to a visual or auditory oddball stimulus in subjects with Alzheimer's disease and in a healthy control group and pooled effect sizes for differences in P300 amplitude between Alzheimer's disease and control groups to obtain summary effect sizes. We also used meta-regression to determine whether age, sex, educational attainment, or dementia severity affected the association between P300 amplitude and Alzheimer's disease. Twenty articles containing a total of 646 subjects met inclusion and exclusion criteria. The overall effect size from all electrode locations was 1.079 (95% confidence interval=0.745-1.412, P<.001). The pooled effect sizes for the Cz, Fz, and Pz locations were 1.226 (P<.001), 0.724 (P=.0007), and 1.430 (P<.001), respectively. Meta-regression showed an association between amplitude and educational attainment, but no association between amplitude and age, sex, and dementia severity. In conclusion, P300 amplitude is smaller in subjects with Alzheimer's disease than in healthy controls.
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Affiliation(s)
- Dawson Hedges
- Department of Psychology, Brigham Young University, Provo, UT, USA The Neuroscience Center, Brigham Young University, Provo, UT, USA
| | - Rebecca Janis
- Department of Psychology, Brigham Young University, Provo, UT, USA
| | | | - Cierra Keith
- The Neuroscience Center, Brigham Young University, Provo, UT, USA
| | - David Bennett
- The Neuroscience Center, Brigham Young University, Provo, UT, USA
| | - Bruce L Brown
- Department of Psychology, Brigham Young University, Provo, UT, USA
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Cecchi M, Moore DK, Sadowsky CH, Solomon PR, Doraiswamy PM, Smith CD, Jicha GA, Budson AE, Arnold SE, Fadem KC. A clinical trial to validate event-related potential markers of Alzheimer's disease in outpatient settings. ALZHEIMER'S & DEMENTIA (AMSTERDAM, NETHERLANDS) 2015; 1:387-94. [PMID: 27239520 PMCID: PMC4879492 DOI: 10.1016/j.dadm.2015.08.004] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
INTRODUCTION We investigated whether event-related potentials (ERP) collected in outpatient settings and analyzed with standardized methods can provide a sensitive and reliable measure of the cognitive deficits associated with early Alzheimer's disease (AD). METHODS A total of 103 subjects with probable mild AD and 101 healthy controls were recruited at seven clinical study sites. Subjects were tested using an auditory oddball ERP paradigm. RESULTS Subjects with mild AD showed lower amplitude and increased latency for ERP features associated with attention, working memory, and executive function. These subjects also had decreased accuracy and longer reaction time in the target detection task associated with the ERP test. DISCUSSION Analysis of ERP data showed significant changes in subjects with mild AD that are consistent with the cognitive deficits found in this population. The use of an integrated hardware/software system for data acquisition and automated data analysis methods make administration of ERP tests practical in outpatient settings.
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Affiliation(s)
| | | | - Carl H. Sadowsky
- Department of Neurology, Nova Southeastern University, Fort Lauderdale, FL, USA
| | - Paul R. Solomon
- Department of Psychology, Williams College, Williamstown, MA, USA
| | - P. Murali Doraiswamy
- Departments of Psychiatry and Medicine, Duke Medicine and Duke Institute for Brain Sciences, Durham, NC, USA
| | - Charles D. Smith
- Department of Neurology, University of Kentucky, Lexington, KY, USA
| | - Gregory A. Jicha
- Department of Neurology, University of Kentucky, Lexington, KY, USA
| | - Andrew E. Budson
- Department of Cognitive & Behavioral Neurology, VA Boston Healthcare System, Boston, MA, USA
| | - Steven E. Arnold
- Departments of Psychiatry and Neurology, University of Pennsylvania, Philadelphia, PA, USA
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Braverman ER, Blum K, Hussman KL, Han D, Dushaj K, Li M, Marin G, Badgaiyan RD, Smayda R, Gold MS. Evoked Potentials and Memory/Cognition Tests Validate Brain Atrophy as Measured by 3T MRI (NeuroQuant) in Cognitively Impaired Patients. PLoS One 2015; 10:e0133609. [PMID: 26244349 PMCID: PMC4526533 DOI: 10.1371/journal.pone.0133609] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2014] [Accepted: 06/29/2015] [Indexed: 11/30/2022] Open
Abstract
To our knowledge, this is the largest study evaluating relationships between 3T Magnetic Resonance Imaging (MRI) and P300 and memory/cognitive tests in the literature. The 3T MRI using NeuroQuant has an increased resolution 15 times that of 1.5T MRI. Utilizing NeuroQuant 3T MRI as a diagnostic tool in primary care, subjects (N=169; 19–90 years) displayed increased areas of anatomical atrophy: 34.62% hippocampal atrophy (N=54), 57.14% central atrophy (N=88), and 44.52% temporal atrophy (N=69). A majority of these patients exhibited overlap in measured areas of atrophy and were cognitively impaired. These results positively correlated with decreased P300 values and WMS-III (WMS-III) scores differentially across various brain loci. Delayed latency (p=0.0740) was marginally associated with temporal atrophy; reduced fractional anisotropy (FA) in frontal lobes correlated with aging, delayed P300 latency, and decreased visual and working memory (p=0.0115). Aging and delayed P300 latency correlated with lower FA. The correlation between working memory and reduced FA in frontal lobes is marginally significant (p=0.0787). In the centrum semiovale (CS), reduced FA correlated with visual memory (p=0.0622). Lower demyelination correlated with higher P300 amplitude (p=0.0002). Compared to males, females have higher demyelination (p=0.0064). Along these lines, the higher the P300 amplitude, the lower the bilateral atrophy (p=0.0165). Hippocampal atrophy correlated with increased auditory memory and gender, especially in males (p=0.0087). In considering temporal lobe atrophy correlations: delayed P300 latency and high temporal atrophy (p=0.0740); high auditory memory and low temporal atrophy (p=0.0417); and high working memory and low temporal atrophy (p=0.0166). Central atrophy correlated with aging and immediate memory (p=0.0294): the higher the immediate memory, the lower the central atrophy. Generally, the validation of brain atrophy by P300 and WMS-III could lead to cost-effective methods utilizable in primary care medicine following further confirmation.
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Affiliation(s)
- Eric R. Braverman
- Department of Psychiatry, McKnight Brain Institute, University of Florida College of Medicine, Gainesville, Florida, United States of America
- Department of Clinical Neurology, PATH Foundation NY, New York, New York, United States of America
- * E-mail:
| | - Kenneth Blum
- Department of Psychiatry, McKnight Brain Institute, University of Florida College of Medicine, Gainesville, Florida, United States of America
- Department of Clinical Neurology, PATH Foundation NY, New York, New York, United States of America
- Human Integrated Services, University of Vermont, Center for Clinical and Translational Science, College of Medicine, Burlington, Vermont, United States of America
- Department of Addiction Services, Dominion Diagnostics, LLC., North Kingstown, Rhode Island, United States of America
| | - Karl L. Hussman
- Alpha 3T MRI & Diagnostic Imaging, New York, New York, United States of America
| | - David Han
- Department of Management Science and Statistics, University of Texas at San Antonio, San Antonio, Texas, United States of America
| | - Kristina Dushaj
- Department of Clinical Neurology, PATH Foundation NY, New York, New York, United States of America
| | - Mona Li
- Department of Clinical Neurology, PATH Foundation NY, New York, New York, United States of America
| | - Gabriela Marin
- Department of Clinical Neurology, PATH Foundation NY, New York, New York, United States of America
| | - Rajendra D. Badgaiyan
- Department of Psychiatry, Neuroimaging Center, University Of Minnesota School of Medicine, Minneapolis, Minnesota, United States of America
| | - Richard Smayda
- Department of Clinical Neurology, PATH Foundation NY, New York, New York, United States of America
| | - Mark S. Gold
- Department of Psychiatry, McKnight Brain Institute, University of Florida College of Medicine, Gainesville, Florida, United States of America
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Memantine effects on verbal memory in fragile X-associated tremor/ataxia syndrome (FXTAS): a double-blind brain potential study. Neuropsychopharmacology 2014; 39:2760-8. [PMID: 24871547 PMCID: PMC4200486 DOI: 10.1038/npp.2014.122] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/08/2014] [Revised: 04/29/2014] [Accepted: 05/08/2014] [Indexed: 12/19/2022]
Abstract
Older FMR1 premutation carriers may develop fragile X-associated tremor/ataxia syndrome (FXTAS), a neurodegenerative disorder manifesting cognitive deficits that often subsequently progress to dementia. To date, there is no specific treatment available for FXTAS. Studies have demonstrated the premutation-associated overactivation of glutamatergic receptors in neurons. Memantine, a NMDA receptor antagonist approved for treatment of Alzheimer's disease, thus was tested in the first placebo-controlled, double-blind, randomized clinical trial in FXTAS. Prior event-related brain potential (ERP) studies in FXTAS found reduced N400 repetition effect, a glutamate-related electrophysiological marker of semantic priming, and verbal memory processes. This substudy of the randomized clinical trial of memantine in FXTAS sought to use the N400 repetition effect to evaluate effects of chronic memantine treatment on verbal memory. Subsequent recall and recognition memory tests for the experimental stimuli were administered to characterize verbal memory. Data from 41 patients who completed the 1-year memantine trial (21 on memantine) and also completed longitudinal ERP studies were analyzed. Results showed treatment-associated benefits on both cued-recall memory and N400 repetition effect amplitude. Importantly, improvement in cued recall was positively correlated with amplitude increase of the N400 repetition effect. The placebo group, in contrast, displayed a significant reduction of the N400 repetition effect after 1 year. These results suggest that memantine treatment may have beneficial effects on verbal memory in FXTAS. Additional studies of memantine, perhaps in combination with other therapeutic agents, appear warranted, as symptomatic treatments and neuroprotective treatments are both needed for this recently recognized neurodegenerative disorder.
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The time course of spoken word recognition in Mandarin Chinese: A unimodal ERP study. Neuropsychologia 2014; 63:165-74. [DOI: 10.1016/j.neuropsychologia.2014.08.015] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2014] [Revised: 08/08/2014] [Accepted: 08/14/2014] [Indexed: 11/19/2022]
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Yener GG, Emek-Savaş DD, Güntekin B, Başar E. The visual cognitive network, but not the visual sensory network, is affected in amnestic mild cognitive impairment: a study of brain oscillatory responses. Brain Res 2014; 1585:141-9. [PMID: 25152459 DOI: 10.1016/j.brainres.2014.08.038] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2014] [Revised: 08/13/2014] [Accepted: 08/14/2014] [Indexed: 11/17/2022]
Abstract
Mild Cognitive Impairment (MCI) is considered in many as prodromal stage of Alzheimer's disease (AD). Event-related oscillations (ERO) reflect cognitive responses of brain whereas sensory-evoked oscillations (SEO) inform about sensory responses. For this study, we compared visual SEO and ERO responses in MCI to explore brain dynamics (BACKGROUND). Forty-three patients with MCI (mean age=74.0 year) and 41 age- and education-matched healthy-elderly controls (HC) (mean age=71.1 year) participated in the study. The maximum peak-to-peak amplitudes for each subject's averaged delta response (0.5-3.0 Hz) were measured from two conditions (simple visual stimulation and classical visual oddball paradigm target stimulation) (METHOD). Overall, amplitudes of target ERO responses were higher than SEO amplitudes. The preferential location for maximum amplitude values was frontal lobe for ERO and occipital lobe for SEO. The ANOVA for delta responses showed significant results for the group Xparadigm. Post-hoc tests indicated that (1) the difference between groups were significant for target delta responses, but not for SEO, (2) ERO elicited higher responses for HC than MCI patients, and (3) females had higher target ERO than males and this difference was pronounced in the control group (RESULTS). Overall, cognitive responses display almost double the amplitudes of sensory responses over frontal regions. The topography of oscillatory responses differs depending on stimuli: visualsensory responses are highest over occipitals and -cognitive responses over frontal regions. A group effect is observed in MCI indicating that visual sensory and cognitive circuits behave differently indicating preserved visual sensory responses, but decreased cognitive responses (CONCLUSION).
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Affiliation(s)
- Görsev G Yener
- Brain Dynamics Multidisciplinary Research Center, Dokuz Eylül University, Izmir 35340, Turkey; Department of Neurosciences, Dokuz Eylül University, Izmir 35340, Turkey; Department of Neurology, Dokuz Eylül University Medical School, Balçova, Izmir 35340, Turkey; Brain Dynamics, Cognition and Complex Systems Research Center, Istanbul Kultur University, Istanbul 34156, Turkey.
| | - Derya Durusu Emek-Savaş
- Department of Neurosciences, Dokuz Eylül University, Izmir 35340, Turkey; Brain Dynamics, Cognition and Complex Systems Research Center, Istanbul Kultur University, Istanbul 34156, Turkey
| | - Bahar Güntekin
- Brain Dynamics, Cognition and Complex Systems Research Center, Istanbul Kultur University, Istanbul 34156, Turkey
| | - Erol Başar
- Brain Dynamics, Cognition and Complex Systems Research Center, Istanbul Kultur University, Istanbul 34156, Turkey
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McBride JC, Zhao X, Munro NB, Smith CD, Jicha GA, Hively L, Broster LS, Schmitt FA, Kryscio RJ, Jiang Y. Spectral and complexity analysis of scalp EEG characteristics for mild cognitive impairment and early Alzheimer's disease. COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2014; 114:153-63. [PMID: 24598317 PMCID: PMC4021716 DOI: 10.1016/j.cmpb.2014.01.019] [Citation(s) in RCA: 87] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2013] [Revised: 01/17/2014] [Accepted: 01/28/2014] [Indexed: 06/03/2023]
Abstract
Amnestic mild cognitive impairment (aMCI) often is an early stage of Alzheimer's disease (AD). MCI is characterized by cognitive decline departing from normal cognitive aging but that does not significantly interfere with daily activities. This study explores the potential of scalp EEG for early detection of alterations from cognitively normal status of older adults signifying MCI and AD. Resting 32-channel EEG records from 48 age-matched participants (mean age 75.7 years)-15 normal controls (NC), 16 early MCI, and 17 early stage AD-are examined. Regional spectral and complexity features are computed and used in a support vector machine model to discriminate between groups. Analyses based on three-way classifications demonstrate overall discrimination accuracies of 83.3%, 85.4%, and 79.2% for resting eyes open, counting eyes closed, and resting eyes closed protocols, respectively. These results demonstrate the great promise for scalp EEG spectral and complexity features as noninvasive biomarkers for detection of MCI and early AD.
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Affiliation(s)
- Joseph C McBride
- Department of Mechanical, Aerospace, and Biomedical Engineering, University of Tennessee, Knoxville, Knoxville, TN 37996, United States
| | - Xiaopeng Zhao
- Department of Mechanical, Aerospace, and Biomedical Engineering, University of Tennessee, Knoxville, Knoxville, TN 37996, United States; National Institute for Mathematical and Biological Synthesis, University of Tennessee, Knoxville, Knoxville, TN 37996, United States.
| | - Nancy B Munro
- Oak Ridge National Laboratory, Oak Ridge, TN 37831-6418, United States
| | - Charles D Smith
- Department of Neurology, University of Kentucky, Lexington, KY 40356, United States; Sanders-Brown Center on Aging, University of Kentucky, Lexington, KY 40356, United States
| | - Gregory A Jicha
- Department of Neurology, University of Kentucky, Lexington, KY 40356, United States; Sanders-Brown Center on Aging, University of Kentucky, Lexington, KY 40356, United States
| | - Lee Hively
- Oak Ridge National Laboratory, Oak Ridge, TN 37831-6418, United States
| | - Lucas S Broster
- Department of Behavioral Science, University of Kentucky, Lexington, KY 40356, United States; Sanders-Brown Center on Aging, University of Kentucky, Lexington, KY 40356, United States
| | - Frederick A Schmitt
- Department of Neurology, University of Kentucky, Lexington, KY 40356, United States; Sanders-Brown Center on Aging, University of Kentucky, Lexington, KY 40356, United States
| | - Richard J Kryscio
- Sanders-Brown Center on Aging, University of Kentucky, Lexington, KY 40356, United States; Department of Statistics, University of Kentucky, Lexington, KY 40356, United States
| | - Yang Jiang
- Sanders-Brown Center on Aging, University of Kentucky, Lexington, KY 40356, United States; Department of Behavioral Science, University of Kentucky, Lexington, KY 40356, United States
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Ritchie CW, Wells K, Ritchie K. The PREVENT research programme--a novel research programme to identify and manage midlife risk for dementia: the conceptual framework. Int Rev Psychiatry 2013; 25:748-54. [PMID: 24423227 DOI: 10.3109/09540261.2013.869195] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
It is clear that the neurodegenerative disease processes which cause dementias are initiated many years before the onset of symptoms. In people with mild cognitive impairment there is already good evidence available to suggest that many of the key pathologies are well established. The PREVENT research programme seeks to understand the origin point and sequence of pathological changes which lead to dementia. It also aims to determine what clinical, environmental and genetic factors increase (or decrease) the risk of these changes initiating and developing. From this data we will be able to develop risk models that can be applied both in clinical practice and research which illustrate the chances a given individual has of developing clinical symptoms of neurodegenerative disease. Once these risks are identified and the sequence of pathological events are characterized; interventions to remove risk or reduce the impact of a risk can be undertaken, as can studies of agents which specifically target the earliest or most up-stream pathological processes. This paper provides the conceptual framework for the PREVENT programme and other similar studies interrogating people in midlife with a view to providing empirical evidence to inform intervention studies and better clinical practice.
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Major ZZ, Văcăraş V, Buzoianu AD, Mureşanu DF. Glatiramer Acetate Treatment-Related Effects on Visual EPs and P300 Wave in Patients Suffering from Multiple Sclerosis. NEUROPHYSIOLOGY+ 2013. [DOI: 10.1007/s11062-013-9361-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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68
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Lu B, Nagappan G, Nathan PJ, Blin O. Synaptic function as a preclinical and experimental medicine readout for disease-modifying therapy in Alzheimer's Disease. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/j.ddstr.2014.04.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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69
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Biomarkers in Alzheimer's disease with a special emphasis on event-related oscillatory responses. APPLICATION OF BRAIN OSCILLATIONS IN NEUROPSYCHIATRIC DISEASES - SELECTED PAPERS FROM “BRAIN OSCILLATIONS IN COGNITIVE IMPAIRMENT AND NEUROTRANSMITTERS” CONFERENCE, ISTANBUL, TURKEY, 29 APRIL–1 MAY 2011 2013; 62:237-73. [DOI: 10.1016/b978-0-7020-5307-8.00020-x] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Parra MA, Ascencio LL, Urquina HF, Manes F, Ibáñez AM. P300 and neuropsychological assessment in mild cognitive impairment and Alzheimer dementia. Front Neurol 2012; 3:172. [PMID: 23227021 PMCID: PMC3514532 DOI: 10.3389/fneur.2012.00172] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2012] [Accepted: 11/13/2012] [Indexed: 11/25/2022] Open
Abstract
Only a small proportion of individuals with Mild Cognitive Impairment (MCI) will convert to dementia. Methods currently available to identify risk for conversion do not combine enough sensitivity and specificity, which is even more problematic in low-educated populations. Current guidelines suggest the use of combined markers for dementia to enhance the prediction accuracy of assessment methods. The present study adhered to this proposal and investigated the sensitivity and specificity of the electrophysiological component P300 and standard neuropsychological tests to assess patients with Alzheimer's disease (AD) and MCI recruited from a low-income country. The neuropsychological battery comprised tests of memory, attention, language, praxis, and executive functions. The P300 was recorded using a classical visual odd-ball paradigm. Three variables were found to achieve sensitivity and specificity values above 80% (Immediate and Delayed recall of word list - CERAD - and the latency of P300) for both MCI and AD. When they entered the model together (i.e., combined approach) the sensitivity for MCI increased to 96% and the specificity remained high (80%). Our preliminary findings suggest that the combined use of sensitive neuropsychological tasks and the analysis of the P300 may offer a very useful method for the preclinical assessment of AD, particularly in populations with low socioeconomic and educational levels. Our results provide a platform and justification to employ more resources to convert P300 and related parameters into a biological marker for AD.
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Affiliation(s)
- Mario A. Parra
- Scottish Dementia Clinical Research NetworkPerth, Scotland, UK
- Human Cognitive Neuroscience, Psychology Department, University of EdinburghEdinburgh, UK
- Neuropsy and Biomedical Unit, Health Faculty, Surcolombiana UniversityNeiva, Colombia
| | | | - Hugo Fenando Urquina
- Neuropsy and Biomedical Unit, Health Faculty, Surcolombiana UniversityNeiva, Colombia
- Laboratory of Experimental Psychology and Neurosciences, Institute of Cognitive Neurology and Institute of Neuroscience, Favaloro UniversityBuenos Aires, Argentina
| | - Facundo Manes
- Laboratory of Experimental Psychology and Neurosciences, Institute of Cognitive Neurology and Institute of Neuroscience, Favaloro UniversityBuenos Aires, Argentina
| | - Agustín M. Ibáñez
- Laboratory of Experimental Psychology and Neurosciences, Institute of Cognitive Neurology and Institute of Neuroscience, Favaloro UniversityBuenos Aires, Argentina
- Laboratory of Cognitive and Social Neuroscience, Universidad Diego PortalesSantiago, Chile
- National Scientific and Technical Research CouncilBuenos Aires, Argentina
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Ashford JW, Salehi A, Furst A, Bayley P, Frisoni GB, Jack CR, Sabri O, Adamson MM, Coburn KL, Olichney J, Schuff N, Spielman D, Edland SD, Black S, Rosen A, Kennedy D, Weiner M, Perry G. Imaging the Alzheimer brain. J Alzheimers Dis 2011; 26 Suppl 3:1-27. [PMID: 21971448 PMCID: PMC3760773 DOI: 10.3233/jad-2011-0073] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
This supplement to the Journal of Alzheimer's Disease contains more than half of the chapters from The Handbook of Imaging the Alzheimer Brain, which was first presented at the International Conference on Alzheimer's Disease in Paris, in July, 2011. While the Handbook contains 27 chapters that are modified articles from 2009, 2010, and 2011 issues of the Journal of Alzheimer's Disease, this supplement contains the 31 new chapters of that book and an introductory article drawn from the introductions to each section of the book. The Handbook was designed to provide a multilevel overview of the full field of brain imaging related to Alzheimer's disease (AD). The Handbook, as well as this supplement, contains both reviews of the basic concepts of imaging, the latest developments in imaging, and various discussions and perspectives of the problems of the field and promising directions. The Handbook was designed to be useful for students and clinicians interested in AD as well as scientists studying the brain and pathology related to AD.
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