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Neuroimaging and memory

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https://www.readbyqxmd.com/read/29130061/episodic-future-thinking-mechanisms-and-functions
#1
Daniel L Schacter, Roland G Benoit, Karl K Szpunar
Episodic future thinking refers to the capacity to imagine or simulate experiences that might occur in one's personal future. Cognitive, neuropsychological, and neuroimaging research concerning episodic future thinking has accelerated during recent years. This article discusses research that has delineated cognitive and neural mechanisms that support episodic future thinking as well as the functions that episodic future thinking serves. Studies focused on mechanisms have identified a core brain network that underlies episodic future thinking and have begun to tease apart the relative contributions of particular regions in this network, and the specific cognitive processes that they support...
October 2017: Current Opinion in Behavioral Sciences
https://www.readbyqxmd.com/read/29122592/new-perspectives-on-the-brain-lesion-approach-implications-for-theoretical-models-of-human-memory
#2
Muireann Irish, Marlieke T R van Kesteren
Human lesion studies represent the cornerstone of modern day neuropsychology and provide an important adjunct to functional neuroimaging methods. The study of human lesion groups with damage to distinct regions of the brain permits the identification of underlying mechanisms and structures not only associated with, but essential for, complex cognitive processes. Here, we consider a recent review by McCormick et al. in which the power of the lesion model approach is elegantly presented with respect to a host of sophisticated cognitive endeavors, including autobiographical memory, future thinking, spatial navigation, and decision-making...
November 6, 2017: Neuroscience
https://www.readbyqxmd.com/read/29119933/pharmacological-and-non-pharmacological-therapies-of-cognitive-impairment-in-multiple-sclerosis
#3
Elzbieta Miller, Agnieszka Morel, Justyna Redlicka, Igor Miller, Joanna Saluk
Cognitive impairment is one of the most important clinical features of neurodegenerative disorders including multiple sclerosis (MS). Conducted research shows that up to 65 percent of MS patients have cognitive deficits such as episodic memory, sustained attention, reduced verbal fluency; however, the cognitive MS domain is information processing speed. It is the first syndrome of cognitive dysfunction and the most widely affected in MS. Occasionally these impairments occur even before the appearance of physical symptoms...
November 9, 2017: Current Neuropharmacology
https://www.readbyqxmd.com/read/29114732/amyloid-%C3%AE-deposition-and-suspected-non-alzheimer-pathophysiology-and-cognitive-decline-patterns-for-12-years-in-oldest-old-participants-without-dementia
#4
Yujing Zhao, Dana L Tudorascu, Oscar L Lopez, Ann D Cohen, Chester A Mathis, Howard J Aizenstein, Julie C Price, Lewis H Kuller, M Ilyas Kamboh, Steven T DeKosky, William E Klunk, Beth E Snitz
Importance: The prevalence of pathologic conditions of the brain associated with Alzheimer disease increases strongly with age. Little is known about the distribution and clinical significance of preclinical biomarker staging in the oldest old, when most individuals without dementia are likely to have positive biomarkers. Objective: To compare the patterns of long-term cognitive decline in multiple domains by preclinical biomarker status in the oldest old without dementia...
November 6, 2017: JAMA Neurology
https://www.readbyqxmd.com/read/29113944/reliability-of-functional-magnetic-resonance-imaging-activation-during-working-memory-in-a-multisite-study-clarification-and-implications-for-statistical-power
#5
Tyrone D Cannon, Hengyi Cao, Daniel H Mathalon, Jennifer Forsyth
In this technical note, we clarify the meaning of the generalizability-theory based coefficients reported in our multisite reliability study of fMRI measures of regional brain activation during working memory processing (Forsyth et al., Neuroimage 2014;97:51-52). While the original paper reported generalizability and dependability coefficients based on the design of our traveling subjects study (in which each subject was scanned twice at each of eight sites), those coefficients are of limited applicability outside of the reliability study context...
November 4, 2017: NeuroImage
https://www.readbyqxmd.com/read/29110613/a-biomarker-combining-imaging-and-neuropsychological-assessment-for-tracking-early-alzheimer-s-disease-in-clinical-trials
#6
Nishant Verma, S Natasha Beretvas, Belen Pascual, Joseph C Masdeu, Mia K Markey, The Alzheimer S Disease Neuroimaging Initiative
BACKGROUND: Combining optimized cognitive (Alzheimer's Disease Assessment Scale-Cognitive subscale, ADAS-Cog) and atrophy markers of Alzheimer's disease for tracking progression in clinical trials may provide greater sensitivity than currently used methods, which have yielded negative results in multiple recent trials. Furthermore, it is critical to clarify the relationship among the subcomponents yielded by cognitive and imaging testing, to address the symptomatic and anatomical variability of Alzheimer's disease...
November 6, 2017: Current Alzheimer Research
https://www.readbyqxmd.com/read/29109237/sleep-deprivation-promotes-habitual-control-over-goal-directed-control-behavioral-and-neuroimaging-evidence
#7
Jie Chen, Jie Liang, Xiao Lin, Yang Zhang, Yan Zhang, Lin Lu, Jie Shi
Sleep is one of the most fundamental processes of life, playing an important role in the regulation of brain function. The long-term lack of sleep can cause memory impairments, declines in learning ability, and executive dysfunction. In the present study, we evaluated the effects of sleep deprivation on instrumental learning behavior, particularly goal-directed and habitual actions in humans, and investigated the underlying neural mechanisms. Healthy college students of either gender were enrolled and randomly divided into sleep deprivation group and sleep control group...
November 6, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29103867/impact-of-analgesics-on-executive-function-and-memory-in-the-alzheimer-s-disease-neuroimaging-initiative-database
#8
Lisa Doan, Daniel Choi, Richard Kline
BACKGROUND AND AIMS: Pain is common in older adults but may be undertreated in part due to concerns about medication toxicity. Analgesics may affect cognition. In this retrospective cohort study, we used the Alzheimer's Disease Neuroimaging Initiative (ADNI) database to examine the interaction of cognitive status and medications, especially non-steroidal anti-inflammatory drugs (NSAIDs). We hypothesized NSAID use would be associated with cognition and that this could be mediated through changes in brain structure...
November 2, 2017: Scandinavian Journal of Pain
https://www.readbyqxmd.com/read/29094500/the-left-supramarginal-gyrus-contributes-to-finger-positioning-for-object-use-a-neuronavigated-tms-study
#9
Michael Andres, Barbara Pelgrims, Etienne Olivier, Gilles Vannuscorps
In everyday actions, we grasp dozens of different manipulable objects in ways that accommodate their functional use. Neuroimaging studies showed that grasping objects in a way that is appropriate for their use involves a left-lateralized network including the supramarginal gyrus (SMG), the anterior intraparietal area (AIP) and the ventral premotor cortex (PMv). However, because previous works premised their conclusions on tasks requiring action execution, it has remained difficult to discriminate between the areas involved in specifying the position of fingers onto the object from those implementing the motor program required to perform the action...
November 2, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/29091778/risk-factors-for-amyloid-positivity-in-older-people-reporting-significant-memory-concern
#10
Jie Zhang, Wenjun Zhou, Ryan M Cassidy, Hang Su, Yindan Su, Xiangyang Zhang
OBJECTIVE: The goal of this study is to identify risk factors for the presence of amyloid accumulation in the brains of patients reporting subjective cognitive decline (SCD). Identifying such risk factors will help better identify patients who ought to receive neuroimaging studies to confirm plaque presence and begin intervention, as well as enhancing the study of the pathogenesis of Alzheimer's disease. METHODS: Ninety-nine SCD participants (72.2±5.6years, 57...
October 6, 2017: Comprehensive Psychiatry
https://www.readbyqxmd.com/read/29072188/body-dysmorphic-disorder-latest-neuroanatomical-and-neuropsychological-findings
#11
K Tasios, I Michopoulos
Body dysmorphic disorder (BDD) is characterized by a preoccupation with a perceived defect or flaw in physical appearance that is not observable or appears slight to others. It leads to severe distress and functional impairment. Cognitive-behavioural and neurobiological similarities to obsessive compulsive disorder (OCD) have led to its newly conceived classification as an obsessive compulsive related disorder (OCRD). In the process of investigating the neurobiology of BDD, neuroimaging and neuropsychological studies have been conducted...
July 2017: Psychiatrikē, Psychiatriki
https://www.readbyqxmd.com/read/29065660/twin-svm-based-classification-of-alzheimer-s-disease-using-complex-dual-tree-wavelet-principal-coefficients-and-lda
#12
Saruar Alam, Goo-Rak Kwon, Ji-In Kim, Chun-Su Park
Alzheimer's disease (AD) is a leading cause of dementia, which causes serious health and socioeconomic problems. A progressive neurodegenerative disorder, Alzheimer's causes the structural change in the brain, thereby affecting behavior, cognition, emotions, and memory. Numerous multivariate analysis algorithms have been used for classifying AD, distinguishing it from healthy controls (HC). Efficient early classification of AD and mild cognitive impairment (MCI) from HC is imperative as early preventive care could help to mitigate risk factors...
2017: Journal of Healthcare Engineering
https://www.readbyqxmd.com/read/29065619/diagnosis-of-alzheimer-s-disease-based-on-structural-mri-images-using-a-regularized-extreme-learning-machine-and-pca-features
#13
Ramesh Kumar Lama, Jeonghwan Gwak, Jeong-Seon Park, Sang-Woong Lee
Alzheimer's disease (AD) is a progressive, neurodegenerative brain disorder that attacks neurotransmitters, brain cells, and nerves, affecting brain functions, memory, and behaviors and then finally causing dementia on elderly people. Despite its significance, there is currently no cure for it. However, there are medicines available on prescription that can help delay the progress of the condition. Thus, early diagnosis of AD is essential for patient care and relevant researches. Major challenges in proper diagnosis of AD using existing classification schemes are the availability of a smaller number of training samples and the larger number of possible feature representations...
2017: Journal of Healthcare Engineering
https://www.readbyqxmd.com/read/29060718/spatially-regularized-multifractal-analysis-for-fmri-data
#14
Philippe Ciuciu, Herwig Wendt, Sebastien Combrexelle, Patrice Abry
Scale-free dynamics is nowadays a massively used paradigm to model infraslow macroscopic brain activity. Multifractal analysis is becoming the standard tool to characterize scale-free dynamics. It is commonly used on various modalities of neuroimaging data to evaluate whether arrhythmic fluctuations in ongoing or evoked brain activity are related to pathologies (Alzheimer, epilepsy) or task performance. The success of multifractal analysis in neurosciences remains however so far contrasted: While it lead to relevant findings on M/EEG data, less clear impact was shown when applied to fMRI data...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29057631/functional-connectivity-of-the-hippocampus-in-early-and-vs-late-onset-alzheimer-s-disease
#15
Kee Hyung Park, Young Noh, Eun Jung Choi, Hyungsik Kim, Sohyun Chun, Young Don Son
BACKGROUND AND PURPOSE: Early-onset Alzheimer's disease (EOAD) and late-onset Alzheimer's disease (LOAD) have different clinical and neuroimaging characteristics, but memory decline is usually present in both types. However, there have been few functional studies focused on the hippocampus in Alzheimer's disease. We therefore investigated the functional connectivity between the hippocampus and other brain regions using resting-state fMRI and compared the findings between EOAD and LOAD...
October 2017: Journal of Clinical Neurology
https://www.readbyqxmd.com/read/29055867/pre-surgical-mapping-of-eloquent-cortex-for-paediatric-epilepsy-surgery-candidates-evidence-from-a-review-of-advanced-functional-neuroimaging
#16
REVIEW
Sarah Collinge, Garreth Prendergast, Steven T Mayers, David Marshall, Poppy Siddell, Elizabeth Neilly, Colin D Ferrie, Gayatri Vadlamani, Jeremy Macmullen-Price, Daniel J Warren, Arshad Zaman, Paul Chumas, John Goodden, Matthew C H J Morrall
PURPOSE: A review of all published evidence for mapping eloquent (motor, language and memory) cortex using advanced functional neuroimaging (functional magnetic resonance imaging [fMRI] and magnetoencephalography [MEG]) for paediatric epilepsy surgery candidates has not been conducted previously. Research in this area has predominantly been in adult populations and applicability of these techniques to paediatric populations is less established. METHODS: A review was performed using an advanced systematic search and retrieval of all published papers examining the use of functional neuroimaging for paediatric epilepsy surgery candidates...
November 2017: Seizure: the Journal of the British Epilepsy Association
https://www.readbyqxmd.com/read/29051745/traumatic-brain-injury-severity-neuropathophysiology-and-clinical-outcome-insights-from-multimodal-neuroimaging
#17
Andrei Irimia, Sheng-Yang Matthew Goh, Adam C Wade, Kavi Patel, Paul M Vespa, John D Van Horn
BACKGROUND: The relationship between the acute clinical presentation of patients with traumatic brain injury (TBI), long-term changes in brain structure prompted by injury and chronic functional outcome is insufficiently understood. In this preliminary study, we investigate how acute Glasgow coma score (GCS) and epileptic seizure occurrence after TBIs are statistically related to functional outcome (as quantified using the Glasgow Outcome Score) and to the extent of cortical thinning observed 6 months after the traumatic event...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/29050391/psychogenic-amnesia-syndromes-outcome-and-patterns-of-retrograde-amnesia
#18
Neil A Harrison, Kate Johnston, Federica Corno, Sarah J Casey, Kimberley Friedner, Kate Humphreys, Eli J Jaldow, Mervi Pitkanen, Michael D Kopelman
There are very few case series of patients with acute psychogenic memory loss (also known as dissociative/functional amnesia), and still fewer studies of outcome, or comparisons with neurological memory-disordered patients. Consequently, the literature on psychogenic amnesia is somewhat fragmented and offers little prognostic value for individual patients. In the present study, we reviewed the case records and neuropsychological findings in 53 psychogenic amnesia cases (ratio of 3:1, males:females), in comparison with 21 consecutively recruited neurological memory-disordered patients and 14 healthy control subjects...
September 1, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/29049480/interpreting-biomarker-results-in-individual-patients-with-mild-cognitive-impairment-in-the-alzheimer-s-biomarkers-in-daily-practice-abide-project
#19
Ingrid S van Maurik, Marissa D Zwan, Betty M Tijms, Femke H Bouwman, Charlotte E Teunissen, Philip Scheltens, Mike P Wattjes, Frederik Barkhof, Johannes Berkhof, Wiesje M van der Flier
Importance: Biomarkers do not determine conversion to Alzheimer disease (AD) perfectly, and criteria do not specify how to take patient characteristics into account. Consequently, biomarker use may be challenging for clinicians, especially in patients with mild cognitive impairment (MCI). Objective: To construct biomarker-based prognostic models that enable determination of future AD dementia in patients with MCI. Design, Setting, and Participants: This study is part of the Alzheimer's Biomarkers in Daily Practice (ABIDE) project...
October 16, 2017: JAMA Neurology
https://www.readbyqxmd.com/read/29040763/oxytocin-effects-on-self-referential-processing-behavioral-and-neuroimaging-evidence
#20
Yi Liu, Bing Wu, Xuena Wang, Wenxin Li, Ting Zhang, Xinhuai Wu, Shihui Han
Oxytocin (OT) influences other-oriented mental processes (e.g., trust and empathy) and the underlying neural substrates. However, whether and how OT modulates self-oriented processes and the underlying brain activity remains unclear. Using a double-blind, placebo-controlled between-subjects design, we manipulated memory encoding and retrieval of trait adjectives related to the self, a friend and a celebrity in a self-referential task in male adults. Experiment 1 (N = 51) found that OT vs. placebo treatments reduced response times during encoding self-related trait adjectives but increased recognition scores of self-related information during memory retrieval...
October 4, 2017: Social Cognitive and Affective Neuroscience
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