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Neuroimaging and memory

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https://www.readbyqxmd.com/read/27933636/primary-headaches-in-an-elderly-population-seeking-medical-care-for-cognitive-decline
#1
Michele Feleppa, Silvia Fucci, Marcelo E Bigal
OBJECTIVES: To assess the prevalence of specific headache disorders in a population older than 65 years seeking consultation due to memory problems or cognitive impairment. METHODS: We verified the occurrence of headache symptoms and the impact of headaches on daily life. Headaches were classified as per the International Classification of Headache Disorders, 2nd edition (ICHD-2). All patients were screened with the Mini-Mental State Examination (MMSE), followed by the Selective Reminding Test and neuroimaging...
December 9, 2016: Headache
https://www.readbyqxmd.com/read/27930899/the-cingulate-cortex-of-older-adults-with-excellent-memory-capacity
#2
Feng Lin, Ping Ren, Mark Mapstone, Steven P Meyers, Anton Porsteinsson, Timothy M Baran
Memory deterioration is the earliest and most devastating cognitive deficit in normal aging and Alzheimer's disease (AD). Some older adults, known as "Supernormals", maintain excellent memory. This study examined relationships between cerebral amyloid deposition and functional connectivity (FC) within the cingulate cortex (CC) and between CC and other regions involved in memory maintenance between Supernormals, healthy controls (HC), and those at risk for AD (amnestic mild cognitive impairment [MCI]). Supernormals had significantly stronger FC between anterior CC and R-hippocampus, middle CC (MCC) and L-superior temporal gyrus, and posterior CC (PCC) and R-precuneus, while weaker FC between MCC and R-middle frontal gyrus and MCC and R-thalamus than other groups...
November 19, 2016: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/27923928/visual-sampling-predicts-hippocampal-activity
#3
Zhong-Xu Liu, Kelly Shen, Rosanna K Olsen, Jennifer D Ryan
: Eye movements serve to accumulate information from the visual world, contributing to the formation of coherent memory representations that support cognition and behaviour. The hippocampus and the oculomotor network are well connected anatomically through an extensive set of polysynaptic pathways. However, the extent to which visual sampling behaviour is related to functional responses in the hippocampus during encoding has not been directly studied in human neuroimaging. In the current study, participants engaged in a face processing task while brain responses were recorded with functional magnetic resonance imaging (fMRI) and eye movements were simultaneously monitored...
December 6, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/27922632/a-phenome-wide-examination-of-neural-and-cognitive-function
#4
R A Poldrack, E Congdon, W Triplett, K J Gorgolewski, K H Karlsgodt, J A Mumford, F W Sabb, N B Freimer, E D London, T D Cannon, R M Bilder
This data descriptor outlines a shared neuroimaging dataset from the UCLA Consortium for Neuropsychiatric Phenomics, which focused on understanding the dimensional structure of memory and cognitive control (response inhibition) functions in both healthy individuals (130 subjects) and individuals with neuropsychiatric disorders including schizophrenia (50 subjects), bipolar disorder (49 subjects), and attention deficit/hyperactivity disorder (43 subjects). The dataset includes an extensive set of task-based fMRI assessments, resting fMRI, structural MRI, and high angular resolution diffusion MRI...
December 6, 2016: Scientific Data
https://www.readbyqxmd.com/read/27919751/less-head-motion-during-mri-under-task-than-resting-state-conditions
#5
Willem Huijbers, Koene R A Van Dijk, Meta M Boenniger, Rüdiger Stirnberg, Monique M B Breteler
Head motion reduces data quality of neuroimaging data. In three functional magnetic resonance imaging (MRI) experiments we demonstrate that people make less head movements under task than resting-state conditions. In Experiment 1, we observed less head motion during a memory encoding task than during the resting-state condition. In Experiment 2, using publicly shared data from the UCLA Consortium for Neuropsychiatric Phenomics LA5c Study, we again found less head motion during several active task conditions than during a resting-state condition, although some task conditions also showed comparable motion...
December 2, 2016: NeuroImage
https://www.readbyqxmd.com/read/27917450/the-short-term-effect-of-liver-transplantation-on-the-low-frequency-fluctuation-of-brain-activity-in-cirrhotic-patients-with-and-without-overt-hepatic-encephalopathy
#6
Gaoyan Zhang, Yue Cheng, Wen Shen, Baolin Liu, Lixiang Huang, Shuangshuang Xie
Previous neuropsychological studies have demonstrated that liver transplantation (LT) is an effective method for improving the cognitive function of cirrhotic patients. However, the neural basis underlying the effects of LT is still unclear. Neuroimaging studies investigating changes in brain structures or functional networks mainly focus on patients without overt hepatic encephalopathy (HE). In this study, we recruited patients with and without overt HE and studied alterations in resting-state brain activity by quantizing the amplitude of low-frequency fluctuation (ALFF) before and 1 month after LT to study the short-term effect of LT in each group...
December 5, 2016: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/27916709/insights-to-the-schizophrenia-continuum-a-systematic-review-of-saccadic-eye-movements-in-schizotypy-and-biological-relatives-of-schizophrenia-patients
#7
REVIEW
Jessica B Myles, Susan L Rossell, Andrea Phillipou, Elizabeth Thomas, Caroline Gurvich
Myles, J.B., S. Rossell, A. Phillipou, Thomas, E and C. Gurvich. A systematic review of saccadic eye movements across the schizophrenia continuum: Characterisation, pathophysiology and genetic associations. NEUROSCI BIOBEHAV REV 21(1) XXX-XXX, 2015. One of the cognitive hallmarks of schizophrenia is impaired eye movements, particularly for the antisaccade task. Less saccade research has been conducted in relation to the broader schizophrenia continuum, that is, people with high schizotypy or first-degree relatives of people with schizophrenia...
December 1, 2016: Neuroscience and Biobehavioral Reviews
https://www.readbyqxmd.com/read/27915998/an-update-on-semantic-dementia-genetics-imaging-and-pathology
#8
REVIEW
Ramon Landin-Romero, Rachel Tan, John R Hodges, Fiona Kumfor
Progressive and relatively circumscribed loss of semantic knowledge, referred to as semantic dementia (SD) which falls under the broader umbrella of frontotemporal dementia, was officially identified as a clinical syndrome less than 50 years ago. Here, we review recent neuroimaging, pathological, and genetic research in SD. From a neuroimaging perspective, SD is characterised by hallmark asymmetrical atrophy of the anterior temporal pole and anterior fusiform gyrus, which is usually left lateralised. Functional magnetic resonance imaging (fMRI) studies have revealed widespread changes in connectivity, implicating the anterior temporal regions in semantic deficits in SD...
December 5, 2016: Alzheimer's Research & Therapy
https://www.readbyqxmd.com/read/27911319/autotaxin-is-related-to-metabolic-dysfunction-and-predicts-alzheimer-s-disease-outcomes
#9
Kelsey E McLimans, Auriel A Willette
BACKGROUND: Obesity and insulin resistance are associated with neuropathology and cognitive decline in Alzheimer's disease (AD). OBJECTIVE: Ecto-nucleotide pyrophosphatase/phosphodiesterase 2, also called autotaxin, is produced by beige adipose tissue, regulates metabolism, and is higher in AD prefrontal cortex (PFC). Autotaxin may be a novel biomarker of dysmetabolism and AD. METHODS: We studied Alzheimer's Disease Neuroimaging Initiative participants who were cognitively normal (CN; n = 86) or had mild cognitive impairment (MCI; n = 135) or AD (n = 66)...
December 1, 2016: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/27911313/challenges-in-screening-and-recruitment-for-a-neuroimaging-study-in-cognitively-impaired-geriatric-inpatients
#10
Ivayla Apostolova, Catharina Lange, Anna Roberts, Hans Joachim Igel, Anja Mäurer, Stephanie Liese, Melanie Estrella, Vikas Prasad, Elisabeth Stechl, Gernot Lämmler, Elisabeth Steinhagen-Thiessen, Ralph Buchert
BACKGROUND: Neuroimaging-based biomarkers have the potential to improve etiological diagnosis of cognitive impairment in elderly inpatients. However, there is a relative lack of studies on neuroimaging-based biomarkers in hospitalized geriatric patients, as the vast majority of neuroimaging studies in dementia have focused on memory clinic outpatients. An important aspect of study planning is a priori estimation of the rate of screen failures. OBJECTIVE: To report on the rate and causes of screen failures in a prospective study on the utility of neuroimaging (PET, MRI) for the etiological diagnosis of newly manifested cognitive impairment in acutely hospitalized geriatric patients...
November 28, 2016: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/27909421/metacognition-and-perspective-taking-in-alzheimer-s-disease-a-mini-review
#11
REVIEW
Elodie Bertrand, Jesus Landeira-Fernandez, Daniel C Mograbi
Metacognition refers to the monitoring and regulation of cognitive processes and its impairment can lead to a lack of self-awareness of deficits, or anosognosia. In the context of different neurological and psychiatric disorders (e.g., traumatic brain injury, dementia, and schizophrenia), studies have shown that patients who present impairments in metacognitive abilities may be able to recognize such difficulties in others and in themselves when exposed to material in a third-person perspective. Considering that metacognitive impairments are an important characteristic of dementia, especially in Alzheimer's Disease (AD), studies of the relationship between metacognition and perspective-taking may be relevant to improve the quality of life of people with dementia...
2016: Frontiers in Psychology
https://www.readbyqxmd.com/read/27905359/-clinical-and-neuropsychological-features-of-alzheimer-s-disease-in-the-combination-with-cerebrovascular-disease
#12
N A Trusova, O S Levin, A V Arablinsky
AIM: To study clinical/neuropsychological and neuroimaging characteristics of Alzheimer's disease in the combination with cerebrovascular disease (CVD). MATERIAL AND METHODS: Ninety patients with dementia, including 35 patients with AD, 35 patients with mixed dementia (MD) and 20 patients with vascular dementia, were examined. The character of dementia was established according to NINCDS-ADRDA and NINDS-AIREN criteria. The neuropsychological battery included Addenbrooke's Cognitive Examination (ACE-R), Montreal Cognitive Assessment scale (MoCA), fluency test and the visual memory test (SCT)...
2016: Zhurnal Nevrologii i Psikhiatrii Imeni S.S. Korsakova
https://www.readbyqxmd.com/read/27903817/effects-of-orthostatic-hypotension-on-cognition-in-parkinson-disease
#13
Justin Centi, Roy Freeman, Christopher H Gibbons, Sandy Neargarder, Alexander O Canova, Alice Cronin-Golomb
OBJECTIVE: To investigate the relation between orthostatic hypotension (OH) and posture-mediated cognitive impairment in Parkinson disease (PD) using a cross-sectional and within-group design. METHODS: Individuals without dementia with idiopathic PD included 18 with OH (PDOH) and 19 without OH; 18 control participants were also included. Neuropsychological tests were conducted in supine and upright-tilted positions. Blood pressure was assessed in each posture. RESULTS: The PD groups performed similarly while supine, demonstrating executive dysfunction in sustained attention and response inhibition, and reduced semantic fluency and verbal memory (encoding and retention)...
November 30, 2016: Neurology
https://www.readbyqxmd.com/read/27893017/evaluation-of-cognitive-deficits-and-structural-hippocampal-damage-in-encephalitis-with-leucine-rich-glioma-inactivated-1-antibodies
#14
Carsten Finke, Harald Prüss, Josephine Heine, Sigrid Reuter, Ute A Kopp, Florian Wegner, Florian Then Bergh, Sebastian Koch, Olav Jansen, Thomas Münte, Günther Deuschl, Klemens Ruprecht, Winfried Stöcker, Klaus-Peter Wandinger, Friedemann Paul, Thorsten Bartsch
Importance: Limbic encephalitis with leucine-rich, glioma-inactivated 1 (LGI1) antibodies is one of the most frequent variants of autoimmune encephalitis with antibodies targeting neuronal surface antigens. However, the neuroimaging pattern and long-term cognitive outcome are not well understood. Objective: To study cognitive outcome and structural magnetic resonance imaging (MRI) alterations in patients with anti-LGI1 encephalitis. Design, Setting, and Participants: A cross-sectional study was conducted at the Departments of Neurology at Charité-Universitätsmedizin Berlin and University Hospital Schleswig-Holstein, Kiel, Germany...
November 21, 2016: JAMA Neurology
https://www.readbyqxmd.com/read/27893013/proton-chemical-shift-imaging-of-the-brain-in-pediatric-and-adult-developmental-stuttering
#15
Joseph O'Neill, Zhengchao Dong, Ravi Bansal, Iliyan Ivanov, Xuejun Hao, Jay Desai, Elena Pozzi, Bradley S Peterson
Importance: Developmental stuttering is a neuropsychiatric condition of incompletely understood brain origin. Our recent functional magnetic resonance imaging study indicates a possible partial basis of stuttering in circuits enacting self-regulation of motor activity, attention, and emotion. Objective: To further characterize the neurophysiology of stuttering through in vivo assay of neurometabolites in suspect brain regions. Design, Setting, and Participants: Proton chemical shift imaging of the brain was performed in a case-control study of children and adults with and without stuttering...
November 23, 2016: JAMA Psychiatry
https://www.readbyqxmd.com/read/27890810/interaction-of-language-auditory-and-memory-brain-networks-in-auditory-verbal-hallucinations
#16
REVIEW
Branislava Ćurčić-Blake, Judith Ford, Daniela Hubl, Natasza D Orlov, Iris E Sommer, Flavie Waters, Paul Allen, Renaud Jardri, Peter W Woodruff, David Olivier, Christoph Mulert, Todd S Woodward, André Aleman
Auditory verbal hallucinations (AVH) occur in psychotic disorders, but also as a symptom of other conditions and even in healthy people. Several current theories on the origin of AVH converge, with neuroimaging studies suggesting that the language, auditory and memory/limbic networks are of particular relevance. However, reconciliation of these theories with experimental evidence is missing. We review 50 studies investigating functional (EEG and fMRI) and anatomic (diffusion tensor imaging) connectivity in these networks, and explore the evidence supporting abnormal connectivity in these networks associated with AVH...
November 24, 2016: Progress in Neurobiology
https://www.readbyqxmd.com/read/27884551/resting-state-abnormalities-in-heroin-dependent-individuals
#17
REVIEW
Niki Pandria, Leda Kovatsi, Ana B Vivas, Panagiotis D Bamidis
Drug addiction is a major health problem worldwide. Recent neuroimaging studies have shed light into the underlying mechanisms of drug addiction as well as its consequences to the human brain. The most vulnerable, to heroin addiction, brain regions have been reported to be specific prefrontal, parietal, occipital, and temporal regions, as well as, some subcortical regions. The brain regions involved are usually linked with reward, motivation/drive, memory/learning, inhibition as well as emotional control and seem to form circuits that interact with each other...
November 21, 2016: Neuroscience
https://www.readbyqxmd.com/read/27883250/3d-tract-specific-local-and-global-analysis-of-white-matter-integrity-in-alzheimer-s-disease
#18
Yan Jin, Chao Huang, Madelaine Daianu, Liang Zhan, Emily L Dennis, Robert I Reid, Clifford R Jack, Hongtu Zhu, Paul M Thompson
Alzheimer's disease (AD) is a chronic neurodegenerative disease characterized by progressive decline in memory and other aspects of cognitive function. Diffusion-weighted imaging (DWI) offers a non-invasive approach to delineate the effects of AD on white matter (WM) integrity. Previous studies calculated either some summary statistics over regions of interest (ROI analysis) or some statistics along mean skeleton lines (Tract Based Spatial Statistic [TBSS]), so they cannot quantify subtle local WM alterations along major tracts...
November 24, 2016: Human Brain Mapping
https://www.readbyqxmd.com/read/27881960/testing-the-limits-of-skill-transfer-for-scrabble-experts-in-behavior-and-brain
#19
Sophia van Hees, Penny M Pexman, Ian S Hargreaves, Lenka Zdrazilova, Jessie M Hart, Kaia Myers-Stewart, Filomeno Cortese, Andrea B Protzner
We investigated transfer of the skills developed by competitive Scrabble players. Previous studies reported superior performance for Scrabble experts on the lexical decision task (LDT), suggesting near transfer of Scrabble skills. Here we investigated the potential for far transfer to a symbol decision task (SDT); in particular, transfer of enhanced long-term working memory for vertically presented stimuli. Our behavioral results showed no evidence for far transfer. Despite years of intensive practice, Scrabble experts were no faster and no more accurate than controls in the SDT...
2016: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/27880886/hippocampal-and-diencephalic-pathology-in-developmental-amnesia
#20
Anna M Dzieciol, Jocelyne Bachevalier, Kadharbatcha S Saleem, David G Gadian, Richard Saunders, W K Kling Chong, Tina Banks, Mortimer Mishkin, Faraneh Vargha-Khadem
Developmental amnesia (DA) is a selective episodic memory disorder associated with hypoxia-induced bilateral hippocampal atrophy of early onset. Despite the systemic impact of hypoxia-ischaemia, the resulting brain damage was previously reported to be largely limited to the hippocampus. However, the thalamus and the mammillary bodies are parts of the hippocampal-diencephalic network and are therefore also at risk of injury following hypoxic-ischaemic events. Here, we report a neuroimaging investigation of diencephalic damage in a group of 18 patients with DA (age range 11-35 years), and an equal number of controls...
September 30, 2016: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
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