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Sun YW, Lyu XY, Lei XY, Huang MM, Wang ZM, Gao B. Association study of brain structure-function coupling and glymphatic system function in patients with mild cognitive impairment due to Alzheimer's disease. Front Neurosci 2024; 18:1417986. [PMID: 39139498 PMCID: PMC11320604 DOI: 10.3389/fnins.2024.1417986] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2024] [Accepted: 07/17/2024] [Indexed: 08/15/2024] Open
Abstract
Background Mild cognitive impairment (MCI) is a critical transitional phase from healthy cognitive aging to dementia, offering a unique opportunity for early intervention. However, few studies focus on the correlation of brain structure and functional activity in patients with MCI due to Alzheimer's disease (AD). Elucidating the complex interactions between structural-functional (SC-FC) brain connectivity and glymphatic system function is crucial for understanding this condition. Method The aims of this study were to explore the relationship among SC-FC coupling values, glymphatic system function and cognitive function. 23 MCI patients and 18 healthy controls (HC) underwent diffusion tensor imaging (DTI) and resting-state functional MRI (fMRI). DTI analysis along the perivascular space (DTI-ALPS) index and SC-FC coupling values were calculated using DTI and fMRI. Correlation analysis was conducted to assess the relationship between Mini-Mental State Examination (MMSE) scores, DTI-ALPS index, and coupling values. Receiver operating characteristic (ROC) curves was conducted on the SC-FC coupling between the whole brain and subnetworks. The correlation of coupling values with MMSE scores was also analyzed. Result MCI patients (67.74 ± 6.99 years of age) exhibited significantly lower coupling in the whole-brain network and subnetworks, such as the somatomotor network (SMN) and ventral attention network (VAN), than HCs (63.44 ± 6.92 years of age). Whole-brain network coupling was positively correlated with dorsal attention network (DAN), SMN, and visual network (VN) coupling. MMSE scores were significantly positively correlated with whole-brain coupling and SMN coupling. In MCI, whole-brain network demonstrated the highest performance, followed by the SMN and VAN, with the VN, DAN, limbic network (LN), frontoparietal network (FPN), and default mode network (DMN). Compared to HCs, lower DTI-ALPS index was observed in individuals with MCI. Additionally, the left DTI-ALPS index showed a significant positive correlation with MMSE scores and coupling values in the whole-brain network and SMN. Conclusion These findings reveal the critical role of SC-FC coupling values and the ALPS index in cognitive function of MCI. The positive correlations observed in the left DTI-ALPS and whole-brain and SMN coupling values provide a new insight for investigating the asymmetrical nature of cognitive impairments.
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Affiliation(s)
- Yong-Wen Sun
- Department of Radiology, The Affiliated Hospital of Guizhou Medical University, Guiyang, China
| | - Xin-Yue Lyu
- Department of Radiology, The Affiliated Hospital of Guizhou Medical University, Guiyang, China
| | - Xiao-Yang Lei
- Department of Neurology, The Affiliated Hospital of Guizhou Medical University, Guiyang, China
| | - Ming-Ming Huang
- Department of Radiology, The Affiliated Hospital of Guizhou Medical University, Guiyang, China
| | - Zhen-Min Wang
- Key Laboratory of Brain Imaging, Guizhou Medical University, Guiyang, China
| | - Bo Gao
- Department of Radiology, The Affiliated Hospital of Guizhou Medical University, Guiyang, China
- Key Laboratory of Brain Imaging, Guizhou Medical University, Guiyang, China
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You T, Wang Y, Chen S, Dong Q, Yu J, Cui M. Vascular cognitive impairment: Advances in clinical research and management. Chin Med J (Engl) 2024:00029330-990000000-01159. [PMID: 39048312 DOI: 10.1097/cm9.0000000000003220] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2023] [Indexed: 07/27/2024] Open
Abstract
ABSTRACT Vascular cognitive impairment (VCI) encompasses a wide spectrum of cognitive disorders, ranging from mild cognitive impairment to vascular dementia. Its diagnosis relies on thorough clinical evaluations and neuroimaging. VCI predominately arises from vascular risk factors (VRFs) and cerebrovascular disease, either independently or in conjunction with neurodegeneration. Growing evidence underscores the prevalence of VRFs, highlighting their potential for early prediction of cognitive impairment and dementia in later life. The precise mechanisms linking vascular pathologies to cognitive deficits remain elusive. Chronic cerebrovascular pathology is the most common neuropathological feature of VCI, often interacting synergistically with neurodegenerative processes. Current research efforts are focused on developing and validating reliable biomarkers to unravel the etiology of vascular brain changes in VCI. The collaborative integration of these biomarkers into clinical practice, alongside routine incorporation into neuropathological assessments, presents a promising strategy for predicting and stratifying VCI. The cornerstone of VCI prevention remains the control of VRFs, which includes multi-domain lifestyle modifications. Identifying appropriate pharmacological approaches is also of paramount importance. In this review, we synthesize recent advancements in the field of VCI, including its definition, determinants of vascular risk, pathophysiology, neuroimaging and fluid-correlated biomarkers, predictive methodologies, and current intervention strategies. Increasingly evident is the notion that more rigorous research for VCI, which arises from a complex interplay of physiological events, is still needed to pave the way for better clinical outcomes and enhanced quality of life for affected individuals.
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Affiliation(s)
- Tongyao You
- Department of Neurology, Huashan Hospital, Fudan University, Shanghai 200040, China
| | - Yingzhe Wang
- Department of Neurology, Huashan Hospital, Fudan University, Shanghai 200040, China
| | - Shufen Chen
- Department of Neurology, Huashan Hospital, Fudan University, Shanghai 200040, China
| | - Qiang Dong
- Department of Neurology, Huashan Hospital, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Fudan University, Shanghai 200040, China
- National Center for Neurological Disorders, Huashan Hospital, Fudan University, Shanghai 200040, China
| | - Jintai Yu
- Department of Neurology, Huashan Hospital, Fudan University, Shanghai 200040, China
| | - Mei Cui
- Department of Neurology, Huashan Hospital, Fudan University, Shanghai 200040, China
- Department of Neurology, Huashan Hospital, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Fudan University, Shanghai 200040, China
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Usami N, Asano Y, Ikegame Y, Takei H, Yamada Y, Yano H, Shinoda J. Cerebral Glucose Metabolism in Patients with Chronic Disorders of Consciousness. Can J Neurol Sci 2023; 50:719-729. [PMID: 36200558 DOI: 10.1017/cjn.2022.301] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
OBJECTIVE To measure regional cerebral metabolic rate of glucose (CMRGlu) in patients with chronic disorders of consciousness (DOCs) using 18F-fluorodeoxyglucose positron emission tomography (FDG-PET). METHODS This retrospective cohort study examined 50 patients (mean age: 40.9 ± 20.1 years) with traumatic brain injury (TBI)-induced chronic DOCs [minimally conscious state (MCS)+, n = 20; MCS-, n = 15 and vegetative state (VS), n = 15]. We measured FDG-PET-based CMRGlu values in 12 regions of both brain hemispheres and compared those among MCS+, MCS - and VS patients. RESULTS In both hemispheres, the regional CMRGlu reduced with consciousness deterioration in 11 of 12 regions (91.7%). In seven right hemisphere regions, CMRGlu values were markedly higher in MCS+ patients than in MCS- patients. Furthermore, CMRGlu was suggestively higher in the left occipital region in MCS- patients than in VS patients. CONCLUSION Functional preservation in the left occipital region in patients with chronic DOCs might reflect an awareness of external environments, whereas extensive functional preservation in the right cerebral hemisphere might reflect communication motivation.
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Affiliation(s)
- Noriko Usami
- Chubu Medical Center for Prolonged Traumatic Brain Injury, Gifu, Japan
- Department of Clinical Brain Sciences, Gifu University Graduate School of Medicine, Gifu, Japan
| | - Yoshitaka Asano
- Chubu Medical Center for Prolonged Traumatic Brain Injury, Gifu, Japan
- Department of Clinical Brain Sciences, Gifu University Graduate School of Medicine, Gifu, Japan
| | - Yuka Ikegame
- Chubu Medical Center for Prolonged Traumatic Brain Injury, Gifu, Japan
| | - Hiroaki Takei
- Chubu Medical Center for Prolonged Traumatic Brain Injury, Gifu, Japan
| | - Yuichi Yamada
- Chubu Medical Center for Prolonged Traumatic Brain Injury, Gifu, Japan
| | - Hirohito Yano
- Chubu Medical Center for Prolonged Traumatic Brain Injury, Gifu, Japan
- Department of Clinical Brain Sciences, Gifu University Graduate School of Medicine, Gifu, Japan
| | - Jun Shinoda
- Chubu Medical Center for Prolonged Traumatic Brain Injury, Gifu, Japan
- Department of Clinical Brain Sciences, Gifu University Graduate School of Medicine, Gifu, Japan
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Yu R, Han B, Wu X, Wei G, Zhang J, Ding M, Wen X. Dual-functional network regulation underlies the central executive system in working memory. Neuroscience 2023:S0306-4522(23)00245-2. [PMID: 37286158 DOI: 10.1016/j.neuroscience.2023.05.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Revised: 04/24/2023] [Accepted: 05/27/2023] [Indexed: 06/09/2023]
Abstract
The frontoparietal network (FPN) and cingulo-opercular network (CON) may exert top-down regulation corresponding to the central executive system (CES) in working memory (WM); however, contributions and regulatory mechanisms remain unclear. We examined network interaction mechanisms underpinning the CES by depicting CON- and FPN-mediated whole-brain information flow in WM. We used datasets from participants performing verbal and spatial working memory tasks, divided into encoding, maintenance, and probe stages. We used general linear models to obtain task-activated CON and FPN nodes to define regions of interest (ROI); an online meta-analysis defined alternative ROIs for validation. We calculated whole-brain functional connectivity (FC) maps seeded by CON and FPN nodes at each stage using beta sequence analysis. We used Granger causality analysis to obtain the connectivity maps and assess task-level information flow patterns. For verbal working memory, the CON functionally connected positively and negatively to task-dependent and task-independent networks, respectively, at all stages. FPN FC patterns were similar only in the encoding and maintenance stages. The CON elicited stronger task-level outputs. Main effects were: stable CON→FPN, CON→DMN, CON→visual areas, FPN→visual areas, and phonological areas→FPN. The CON and FPN both up-regulated task-dependent and down-regulated task-independent networks during encoding and probing. Task-level output was slightly stronger for the CON. CON→FPN, CON→DMN, visual areas→CON, and visual areas→FPN showed consistent effects. The CON and FPN might together underlie the CES's neural basis and achieve top-down regulation through information interaction with other large-scale functional networks, and the CON may be a higher-level regulatory core in WM.
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Affiliation(s)
- Renshu Yu
- Department of Psychology, Renmin University of China, Beijing, China, 100872; Laboratory of the Department of Psychology, Renmin University of China, Beijing, China, 100872
| | - Bukui Han
- Department of Psychology, Renmin University of China, Beijing, China, 100872; Laboratory of the Department of Psychology, Renmin University of China, Beijing, China, 100872
| | - Xia Wu
- School of Artificial Intelligence, Beijing Normal University, Beijing, China, 100093
| | - Guodong Wei
- Department of Psychology, Renmin University of China, Beijing, China, 100872; Laboratory of the Department of Psychology, Renmin University of China, Beijing, China, 100872
| | - Junhui Zhang
- Department of Psychology, Renmin University of China, Beijing, China, 100872; Laboratory of the Department of Psychology, Renmin University of China, Beijing, China, 100872
| | - Mingzhou Ding
- J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville FL, USA, 32611
| | - Xiaotong Wen
- Department of Psychology, Renmin University of China, Beijing, China, 100872; Laboratory of the Department of Psychology, Renmin University of China, Beijing, China, 100872; Interdisciplinary Platform of Philosophy and Cognitive Science, Renmin University of China, China, 100872.
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Muir RT, Kapoor A, Cayley ML, Sicard MN, Lien K, Southwell A, Dowlatshahi D, Sahlas DJ, Saposnik G, Mandzia J, Casaubon LK, Hassan A, Perez Y, Selchen D, Murray BJ, Lanctot K, Kapral MK, Herrmann N, Strother S, Yu AYX, Austin PC, Bronskill SE, Swartz RH. Language discordance as a marker of disparities in cerebrovascular risk and stroke outcomes: A multi-center Canadian study. CEREBRAL CIRCULATION - COGNITION AND BEHAVIOR 2023; 4:100163. [PMID: 36909680 PMCID: PMC9996323 DOI: 10.1016/j.cccb.2023.100163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2022] [Revised: 02/04/2023] [Accepted: 02/16/2023] [Indexed: 02/26/2023]
Abstract
Background Differences in ischemic stroke outcomes occur in those with limited English proficiency. These health disparities might arise when a patient's spoken language is discordant from the primary language utilized by the health system. Language concordance is an understudied concept. We examined whether language concordance is associated with differences in vascular risk or post-stroke functional outcomes, depression, obstructive sleep apnea and cognitive impairment. Methods This was a multi-center observational cross-sectional cohort study. Patients with ischemic stroke/transient ischemic attack (TIA) were consecutively recruited across eight regional stroke centers in Ontario, Canada (2012 - 2018). Participants were language concordant (LC) if they spoke English as their native language, ESL if they used English as a second language, or language discordant (LD) if non-English speaking and requiring translation. Results 8156 screened patients. 6,556 met inclusion criteria: 5067 LC, 1207 ESL and 282 LD. Compared to LC patients: (i) ESL had increased odds of diabetes (OR = 1.28, p = 0.002), dyslipidemia (OR = 1.20, p = 0.007), and hypertension (OR = 1.37, p<0.001) (ii) LD speaking patients had an increased odds of having dyslipidemia (OR = 1.35, p = 0.034), hypertension (OR = 1.37, p<0.001), and worse functional outcome (OR = 1.66, p<0.0001). ESL (OR = 1.88, p<0.0001) and LD (OR = 1.71, p<0.0001) patients were more likely to have lower cognitive scores. No associations were noted with obstructive sleep apnea (OSA) or depression. Conclusions Measuring language concordance in stroke/TIA reveals differences in neurovascular risk and functional outcome among patients with limited proficiency in the primary language of their health system. Lower cognitive scores must be interpreted with caution as they may be influenced by translation and/or greater vascular risk. Language concordance is a simple, readily available marker to identify those at risk of worse functional outcome. Stroke systems and practitioners must now study why these differences exist and devise adaptive care models, treatments and education strategies to mitigate barriers influenced by language discordance.
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Affiliation(s)
- Ryan T Muir
- University of Toronto, Department of Medicine, Division of Neurology, Sunnybrook Health Sciences Centre, Toronto, ON, Canada
| | - Arunima Kapoor
- University of Toronto, Department of Medicine, Division of Neurology, Sunnybrook Health Sciences Centre, Toronto, ON, Canada
| | - Megan L Cayley
- University of Toronto, Department of Medicine, Division of Neurology, Sunnybrook Health Sciences Centre, Toronto, ON, Canada
| | - Michelle N Sicard
- University of Toronto, Department of Medicine, Division of Neurology, Sunnybrook Health Sciences Centre, Toronto, ON, Canada
| | - Karen Lien
- University of Toronto, Department of Medicine, Division of Neurology, Sunnybrook Health Sciences Centre, Toronto, ON, Canada
| | - Alisia Southwell
- University of Toronto, Department of Medicine, Division of Neurology, Sunnybrook Health Sciences Centre, Toronto, ON, Canada
| | - Dar Dowlatshahi
- Ottawa Stroke Program, Ottawa Hospital Research Institute, Ottawa, ON, Canada
| | - Demetrios J Sahlas
- McMaster University, Department of Medicine (Neurology), Hamilton General Hospital, Hamilton Health Sciences, Hamilton, ON, Canada
| | - Gustavo Saposnik
- St. Michael's Hospital, Division of Neurology, Toronto, ON, Canada
| | - Jennifer Mandzia
- London Health Sciences Centre, Division of Neurology, London, ON, Canada
| | - Leanne K Casaubon
- University Health Network/Toronto Western Hospital, Division of Neurology, Toronto, ON, Canada
| | - Ayman Hassan
- Thunder Bay Regional Health Sciences Centre, Division of Neurology, Thunder Bay, ON, Canada
| | - Yael Perez
- Trillium Health Partners, Department of Medicine (Neurology), Mississauga, ON, Canada
| | - Daniel Selchen
- St. Michael's Hospital, Division of Neurology, Toronto, ON, Canada
| | - Brian J Murray
- University of Toronto, Department of Medicine, Division of Neurology, Sunnybrook Health Sciences Centre, Toronto, ON, Canada.,Sunnybrook Research Institute, Toronto, ON, Canada
| | - Krista Lanctot
- Sunnybrook Research Institute, Toronto, ON, Canada.,University of Toronto, Department of Psychiatry, Sunnybrook Health Sciences Centre, Toronto, ON Canada
| | - Moira K Kapral
- Sunnybrook Research Institute, Toronto, ON, Canada.,University of Toronto, Department of Medicine, Division of General Internal Medicine, Toronto, Canada.,ICES, Toronto, ON, Canada.,University of Toronto, Institute of Health Policy Management and Evaluation, Toronto, ON, Canada
| | - Nathan Herrmann
- Sunnybrook Research Institute, Toronto, ON, Canada.,University of Toronto, Department of Psychiatry, Sunnybrook Health Sciences Centre, Toronto, ON Canada
| | - Stephen Strother
- Rotman Research Institute, Centre for Stroke Recovery, Baycrest Site, Toronto, ON, Canada
| | - Amy Y X Yu
- University of Toronto, Department of Medicine, Division of Neurology, Sunnybrook Health Sciences Centre, Toronto, ON, Canada.,Sunnybrook Research Institute, Toronto, ON, Canada.,ICES, Toronto, ON, Canada.,University of Toronto, Institute of Health Policy Management and Evaluation, Toronto, ON, Canada
| | - Peter C Austin
- ICES, Toronto, ON, Canada.,University of Toronto, Institute of Health Policy Management and Evaluation, Toronto, ON, Canada
| | - Susan E Bronskill
- Sunnybrook Research Institute, Toronto, ON, Canada.,ICES, Toronto, ON, Canada.,University of Toronto, Institute of Health Policy Management and Evaluation, Toronto, ON, Canada
| | - Richard H Swartz
- University of Toronto, Department of Medicine, Division of Neurology, Sunnybrook Health Sciences Centre, Toronto, ON, Canada.,Sunnybrook Research Institute, Toronto, ON, Canada.,ICES, Toronto, ON, Canada
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RNN Language Processing Model-Driven Spoken Dialogue System Modeling Method. COMPUTATIONAL INTELLIGENCE AND NEUROSCIENCE 2022; 2022:6993515. [PMID: 35256880 PMCID: PMC8898104 DOI: 10.1155/2022/6993515] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/07/2022] [Revised: 01/20/2022] [Accepted: 01/21/2022] [Indexed: 11/18/2022]
Abstract
Speech recognition and semantic understanding of spoken language are critical components in determining the dialogue system's performance in SDS. In the study of SDS, the improvement of SLU performance is critical. By influencing the factors before and after the input text sequence information, RNN predicts the next text information. The RNN language model's probability score is introduced, and the recognition's intermediate result is rescored. A method of combining cache RNN models to optimize the decoding process and improve the accuracy of word sequence probability calculation of language model on test data is proposed to address the problem of mismatch between test data and training data in recognition. The results of the experiments show that the method proposed in this paper can effectively improve the recognition system's performance on the test set. It has the potential to achieve a higher SLU score. It is useful for future research on spoken dialogue and SLU issues.
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Liu Z, Paek EJ, Yoon SO, Casenhiser D, Zhou W, Zhao X. Detecting Alzheimer's Disease Using Natural Language Processing of Referential Communication Task Transcripts. J Alzheimers Dis 2022; 86:1385-1398. [PMID: 35213368 DOI: 10.3233/jad-215137] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
BACKGROUND People with Alzheimer's disease (AD) often demonstrate difficulties in discourse production. Referential communication tasks (RCTs) are used to examine a speaker's capability to select and verbally code the characteristics of an object in interactive conversation. OBJECTIVE In this study, we used contextualized word representations from Natural language processing (NLP) to evaluate how well RCTs are able to distinguish between people with AD and cognitively healthy older adults. METHODS We adapted machine learning techniques to analyze manually transcribed speech transcripts in an RCT from 28 older adults, including 12 with AD and 16 cognitively healthy older adults. Two approaches were applied to classify these speech transcript samples: 1) using clinically relevant linguistic features, 2) using machine learned representations derived by a state-of-art pretrained NLP transfer learning model, Bidirectional Encoder Representation from Transformer (BERT) based classification model. RESULTS The results demonstrated the superior performance of AD detection using a designed transfer learning NLP algorithm. Moreover, the analysis showed that transcripts of a single image yielded high accuracies in AD detection. CONCLUSION The results indicated that RCT may be useful as a diagnostic tool for AD, and that the task can be simplified to a subset of images without significant sacrifice to diagnostic accuracy, which can make RCT an easier and more practical tool for AD diagnosis. The results also demonstrate the potential of RCT as a tool to better understand cognitive deficits from the perspective of discourse production in people with AD.
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Affiliation(s)
- Ziming Liu
- Department of Mechanical, Aerospace, and Biomedical Engineering, University of Tennessee, Knoxville, TN, USA
| | - Eun Jin Paek
- Department of Audiology and Speech Pathology, College of Health Professions, University of Tennessee Health Science Center, Knoxville, TN, USA
| | - Si On Yoon
- Department of Communication Sciences and Disorder, University of Iowa, IA, USA
| | - Devin Casenhiser
- Department of Audiology and Speech Pathology, College of Health Professions, University of Tennessee Health Science Center, Knoxville, TN, USA
| | - Wenjun Zhou
- Department of Business Analytics and Statistics, University of Tennessee, Knoxville, TN, USA
| | - Xiaopeng Zhao
- Department of Mechanical, Aerospace, and Biomedical Engineering, University of Tennessee, Knoxville, TN, USA
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8
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Themistocleous C, Ficek B, Webster K, den Ouden DB, Hillis AE, Tsapkini K. Automatic Subtyping of Individuals with Primary Progressive Aphasia. J Alzheimers Dis 2021; 79:1185-1194. [PMID: 33427742 PMCID: PMC7990416 DOI: 10.3233/jad-201101] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND The classification of patients with primary progressive aphasia (PPA) into variants is time-consuming, costly, and requires combined expertise by clinical neurologists, neuropsychologists, speech pathologists, and radiologists. OBJECTIVE The aim of the present study is to determine whether acoustic and linguistic variables provide accurate classification of PPA patients into one of three variants: nonfluent PPA, semantic PPA, and logopenic PPA. METHODS In this paper, we present a machine learning model based on deep neural networks (DNN) for the subtyping of patients with PPA into three main variants, using combined acoustic and linguistic information elicited automatically via acoustic and linguistic analysis. The performance of the DNN was compared to the classification accuracy of Random Forests, Support Vector Machines, and Decision Trees, as well as to expert clinicians' classifications. RESULTS The DNN model outperformed the other machine learning models as well as expert clinicians' classifications with 80% classification accuracy. Importantly, 90% of patients with nfvPPA and 95% of patients with lvPPA was identified correctly, providing reliable subtyping of these patients into their corresponding PPA variants. CONCLUSION We show that the combined speech and language markers from connected speech productions can inform variant subtyping in patients with PPA. The end-to-end automated machine learning approach we present can enable clinicians and researchers to provide an easy, quick, and inexpensive classification of patients with PPA.
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Affiliation(s)
| | - Bronte Ficek
- Johns Hopkins School of Medicine, Baltimore, MD, USA
| | | | - Dirk-Bart den Ouden
- Arnold School of Public Health, University of South Carolina, Columbia, SC, USA
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MACHADO FERNANDOCHIODINI, OLIVEIRA FABRICIOFERREIRADE, MARIN SHEILLADEMEDEIROSCORREIA, SAMPAIO GUSTAVO, BERTOLUCCI PAULOHENRIQUEFERREIRA. Correlates of neuropsychiatric and motor tests with language assessment in patients with Lewy body dementia. ARCH CLIN PSYCHIAT 2020. [DOI: 10.1590/0101-60830000000236] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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10
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Abstract
Human brain function research has evolved dramatically in the last decades. In this chapter the role of modern methods of recording brain activity in understanding human brain function is explained. Current knowledge of brain function relevant to brain-computer interface (BCI) research is detailed, with an emphasis on the motor system which provides an exceptional level of detail to decoding of intended or attempted movements in paralyzed beneficiaries of BCI technology and translation to computer-mediated actions. BCI technologies that stand to benefit the most of the detailed organization of the human cortex are, and for the foreseeable future are likely to be, reliant on intracranial electrodes. These evolving technologies are expected to enable severely paralyzed people to regain the faculty of movement and speech in the coming decades.
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Affiliation(s)
- Nick F Ramsey
- Brain Center, University Medical Center Utrecht, Utrecht, The Netherlands.
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Murray LL. Sentence Processing in Aphasia: An Examination of Material-Specific and General Cognitive Factors. JOURNAL OF NEUROLINGUISTICS 2018; 48:26-46. [PMID: 30686860 PMCID: PMC6345386 DOI: 10.1016/j.jneuroling.2018.03.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
The purpose of this study was to characterize further the nature of sentence processing deficits in acquired aphasia. Adults with aphasia and age-and education-matched adults with no brain damage completed a battery of formal cognitive-linguistic tests and an experimental sentence judgment task, which was performed alone and during focused attention and divided attention or dual-task conditions. The specific aims were to determine whether (a) increased extra-linguistic cognitive demands (i.e., focused and divided conditions) differentially affected the sentence judgement performances of the aphasic and control groups, (b) increased extra- linguistic cognitive demands interact with stimulus parameters (i.e., syntactic complexity, number of propositions) known to influence sentence processing, and (c) syntactic- or material specific resource limitations (e.g., sentence judgment in isolation), general cognitive abilities (e.g., short-term and working memory test scores), or both share a significant relationship with dual-task outcomes. Accuracy, grammatical sensitivity, and reaction time findings were consistent with resource models of aphasia and processing accounts of aphasic syntactic limitations, underscoring the theoretical and clinical importance of acknowledging and specifying the strength and nature of interactions between linguistic and extra-linguistic cognitive processes in not only individuals with aphasia, but also other patient and typical aging populations.
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Affiliation(s)
- Laura L Murray
- School of Communication Sciences and Disorders Western University
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12
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Marchina S, Norton A, Kumar S, Schlaug G. The Effect of Speech Repetition Rate on Neural Activation in Healthy Adults: Implications for Treatment of Aphasia and Other Fluency Disorders. Front Hum Neurosci 2018; 12:69. [PMID: 29535619 PMCID: PMC5835070 DOI: 10.3389/fnhum.2018.00069] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Accepted: 02/07/2018] [Indexed: 11/13/2022] Open
Abstract
Functional imaging studies have provided insight into the effect of rate on production of syllables, pseudowords, and naturalistic speech, but the influence of rate on repetition of commonly-used words/phrases suitable for therapeutic use merits closer examination. Aim: To identify speech-motor regions responsive to rate and test the hypothesis that those regions would provide greater support as rates increase, we used an overt speech repetition task and functional magnetic resonance imaging (fMRI) to capture rate-modulated activation within speech-motor regions and determine whether modulations occur linearly and/or show hemispheric preference. Methods: Twelve healthy, right-handed adults participated in an fMRI task requiring overt repetition of commonly-used words/phrases at rates of 1, 2, and 3 syllables/second (syll./sec.). Results: Across all rates, bilateral activation was found both in ventral portions of primary sensorimotor cortex and middle and superior temporal regions. A repeated measures analysis of variance with pairwise comparisons revealed an overall difference between rates in temporal lobe regions of interest (ROIs) bilaterally (p < 0.001); all six comparisons reached significance (p < 0.05). Five of the six were highly significant (p < 0.008), while the left-hemisphere 2- vs. 3-syll./sec. comparison, though still significant, was less robust (p = 0.037). Temporal ROI mean beta-values increased linearly across the three rates bilaterally. Significant rate effects observed in the temporal lobes were slightly more pronounced in the right-hemisphere. No significant overall rate differences were seen in sensorimotor ROIs, nor was there a clear hemispheric effect. Conclusion: Linear effects in superior temporal ROIs suggest that sensory feedback corresponds directly to task demands. The lesser degree of significance in left-hemisphere activation at the faster, closer-to-normal rate may represent an increase in neural efficiency (and therefore, decreased demand) when the task so closely approximates a highly-practiced function. The presence of significant bilateral activation during overt repetition of words/phrases at all three rates suggests that repetition-based speech production may draw support from either or both hemispheres. This bihemispheric redundancy in regions associated with speech-motor control and their sensitivity to changes in rate may play an important role in interventions for nonfluent aphasia and other fluency disorders, particularly when right-hemisphere structures are the sole remaining pathway for production of meaningful speech.
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Affiliation(s)
- Sarah Marchina
- Music, Stroke Recovery, and Neuroimaging Laboratories, Department of Neurology, Harvard Medical School, Harvard University, Boston, MA, United States
- Beth Israel Deaconess Medical Center, Boston, MA, United States
| | - Andrea Norton
- Music, Stroke Recovery, and Neuroimaging Laboratories, Department of Neurology, Harvard Medical School, Harvard University, Boston, MA, United States
- Beth Israel Deaconess Medical Center, Boston, MA, United States
| | - Sandeep Kumar
- Music, Stroke Recovery, and Neuroimaging Laboratories, Department of Neurology, Harvard Medical School, Harvard University, Boston, MA, United States
- Beth Israel Deaconess Medical Center, Boston, MA, United States
| | - Gottfried Schlaug
- Music, Stroke Recovery, and Neuroimaging Laboratories, Department of Neurology, Harvard Medical School, Harvard University, Boston, MA, United States
- Beth Israel Deaconess Medical Center, Boston, MA, United States
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Pre-stroke employment results in better patient-reported outcomes after minor stroke: Short title: Functional outcomes after minor stroke. Clin Neurol Neurosurg 2017; 165:38-42. [PMID: 29306185 DOI: 10.1016/j.clineuro.2017.12.020] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Revised: 12/20/2017] [Accepted: 12/25/2017] [Indexed: 11/24/2022]
Abstract
OBJECTIVE Individuals with "minor stroke" lack a dense hemiparesis or aphasia; however, commonly endorse persistent cognitive and motor problems despite low NIHSS scores. They also report problems with mood, energy, and the ability to think clearly that are less well characterized. Socioeconomic factors and stroke severity can influence patient-reported outcomes. In this study we explore patient-reported outcomes and the influence of these factors after minor stroke. PATIENTS AND METHODS Patients returning to clinic post-stroke with an NIHSS of ≤ 4 were administered a scale to quantify problems with daily activities and resulting functional burden, along with measures of fatigue and depression. T-tests, chi square analysis, and linear regression were used to compare functional outcomes of patients to controls (TIA or stroke mimic (n = 40)), and evaluate the association between patient-reported outcomes, stroke characteristics, and socioeconomic factors. RESULTS 151 stroke patients were seen a mean 83.6 days post-infarct. Patients reported more problems (11.7 versus 6.9, p = 0.02), resulting in higher functional burden (26.5 versus 12.3, p = 0.01), increased depression (p = 0.07), and greater fatigue (p = 0.02) compared to controls. There was no relationship between stroke characteristics (other than NIHSS), baseline education, income, marital status, or living situation and perception of recovery; however, those actively working prior to their stroke reported better outcomes across all categories (p for each <0.02), and differences persisted in multivariable regression models. CONCLUSION Prior occupational status may represent an important prognostic indicator for patients with minor stroke. Individuals working at the time of their infarct report better functional outcomes irrespective of age or stroke severity.
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