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Cognitive Load

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https://www.readbyqxmd.com/read/28934619/distinct-brain-metabolic-patterns-separately-associated-with-cognition-motor-function-and-aging-in-parkinson-s-disease-dementia
#1
Ji Hyun Ko, Audrey Katako, Maram Aljuaid, Andrew L Goertzen, Andrew Borys, Douglas E Hobson, Seok Min Kim, Chong Sik Lee
We explored whether patients with Parkinson's disease dementia (PDD) show a distinct spatial metabolic pattern that characterizes cognitive deficits in addition to motor dysfunction. Eighteen patients with PDD underwent 3 separate positron emission tomography sessions with [(18)F]fluorodeoxyglucose (for glucose metabolism), fluorinated N-3-fluoropropyl-2-beta-carboxymethoxy-3-beta-(4-iodophenyl) nortropane (for dopamine transporter density) and Pittsburgh compound-B (for beta-amyloid load). We confirmed in PDD versus normal controls, overall hypometabolism in the posterior and prefrontal brain regions accompanied with hypermetabolism in subcortical structures and the cerebellar vermis...
August 31, 2017: Neurobiology of Aging
https://www.readbyqxmd.com/read/28934374/the-effect-of-white-matter-hyperintensities-on-statistical-analysis-of-diffusion-tensor-imaging-in-cognitively-healthy-elderly-and-prodromal-alzheimer-s-disease
#2
Daniel Svärd, Markus Nilsson, Björn Lampinen, Jimmy Lätt, Pia C Sundgren, Erik Stomrud, Lennart Minthon, Oskar Hansson, Danielle van Westen
Diffusion tensor imaging (DTI) has been used to study microstructural white matter alterations in a variety of conditions including normal aging and Alzheimer's disease (AD). White matter hyperintensities (WMH) are common in cognitively healthy elderly as well as in AD and exhibit elevated mean diffusivity (MD) and reduced fractional anisotropy (FA). However, the effect of WMH on statistical analysis of DTI estimates has not been thoroughly studied. In the present study we address this in two ways. First, we investigate the effect of WMH on MD and FA in the dorsal and ventral cingulum, the superior longitudinal fasciculus, and the corticospinal tract, by comparing two matched groups of cognitively healthy elderly (n = 21 + 21) with unequal WMH load...
2017: PloS One
https://www.readbyqxmd.com/read/28934069/to-defend-or-to-affiliate-the-effects-of-categorical-similarity-cues-after-social-exclusion
#3
Jia-Sin Hong, Chien-Ru Sun
This article proposed that after social exclusion, individuals may react in a hostile or amiable manner, which depends on the type of categorical similarity cues that new groups possess. For excluded individuals, groups that resemble their excluder would provoke a defensive attitude. They also exhibit hospitality to groups that resemble themselves to gain inclusion. In experiment 1, social exclusion was manipulated by providing a scenario story regarding an individual who was excluded and subsequently wanted to join in new groups...
September 21, 2017: Journal of Social Psychology
https://www.readbyqxmd.com/read/28933672/cognitive-impairment-and-the-regional-distribution-of-cerebellar-lesions-in-multiple-sclerosis
#4
Sean M Tobyne, Wilson B Ochoa, J Daniel Bireley, Victoria Mj Smith, Jeroen Jg Geurts, Jeremy D Schmahmann, Eric C Klawiter
BACKGROUND: Cerebellar lesions are often reported in relapsing-remitting multiple sclerosis (RRMS) and have been associated with impaired motor function and cognitive status. However, prior research has primarily focused on summary measures of cerebellar involvement (e.g. total lesion load, gray/white matter volume) and not on the effect of lesion load within specific regions of cerebellar white matter. OBJECTIVE: Spatially map the probability of cerebellar white matter lesion (CWML) occurrence in RRMS and explore the relationship between cognitive impairment and lesion (CWML) location within the cerebellum...
September 1, 2017: Multiple Sclerosis: Clinical and Laboratory Research
https://www.readbyqxmd.com/read/28933213/repeated-mild-traumatic-brain-injury-potential-mechanisms-of-damage
#5
Brooke Fehily, Melinda Fitzgerald
Mild traumatic brain injury (mTBI) represents a significant public healthcare concern, accounting for the majority of all head injuries. While symptoms are generally transient, some patients go on to experience long-term cognitive impairments and additional mild impacts can result in exacerbated and persisting negative outcomes. To date, studies using a range of experimental models have reported chronic behavioral deficits in the presence of axonal injury and inflammation following repeated mTBI; assessments of oxidative stress and myelin pathology have thus far been limited...
July 2017: Cell Transplantation
https://www.readbyqxmd.com/read/28929440/the-influence-of-visual-flow-and-perceptual-load-on-locomotion-speed
#6
Casimir J H Ludwig, Nicholas Alexander, Kate L Howard, Alicja A Jedrzejewska, Isha Mundkur, David Redmill
Visual flow is used to perceive and regulate movement speed during locomotion. We assessed the extent to which variation in flow from the ground plane, arising from static visual textures, influences locomotion speed under conditions of concurrent perceptual load. In two experiments, participants walked over a 12-m projected walkway that consisted of stripes that were oriented orthogonal to the walking direction. In the critical conditions, the frequency of the stripes increased or decreased. We observed small, but consistent effects on walking speed, so that participants were walking slower when the frequency increased compared to when the frequency decreased...
September 19, 2017: Attention, Perception & Psychophysics
https://www.readbyqxmd.com/read/28928557/a-comparative-evaluation-of-intravenous-dexmedetomidine-and-fentanyl-in-breast-cancer-surgery-a-prospective-randomized-and-controlled-trial
#7
Sakshi Goyal, Kewal Krishan Gupta, Vikram Mahajan
BACKGROUND AND AIM: Recent studies have advised narcotic less anaestheic techniques for breast cancer surgeries due to altered immune system by use of opioids. So we planned this study to compare the efficacy of dexmedtomidine with fentanyl in breast cancer surgery in terms of haemodynamic stability, anaesthetic sparing effects, recovery profile and postoperative analgesia. MATERIAL AND METHODS: In this randomized prospective controlled trial, a total of 60 female patients were randomly assigned into two groups...
July 2017: Anesthesia, Essays and Researches
https://www.readbyqxmd.com/read/28927512/psychometric-assessment-of-the-depressive-cognition-scale-among-older-chinese-people
#8
Li-Na Guo, Jaclene A Zauszniewski, Xian-Fei Ding, Yong-Chuang Liu, Li-Jie Huang, Yan-Jin Liu
The study aimed to translate the Depressive Cognition Scale (DCS) into Chinese and to test its reliability and validity among Chinese older people. Using a cross-sectional design, a demographic questionnaire and Chinese versions of the Depressive Cognition Scale (DCS-CHI) and the Center for Epidemiological Studies-Depression Scale (CES-D) were administered. The sample consisted of 1673 older people who were from communities and hospitals. The Cronbach's alpha (α) of DCS-CHI was 0.91, and the test-retest correlation coefficient was 0...
October 2017: Archives of Psychiatric Nursing
https://www.readbyqxmd.com/read/28926804/name-that-tune-mitigation-of-driver-fatigue-via-a-song-naming-game
#9
Michael C Trumbo, Aaron P Jones, Charles S H Robinson, Kerstan Cole, James D Morrow
Fatigued driving contributes to a substantial number of motor vehicle accidents each year. Music listening is often employed as a countermeasure during driving in order to mitigate the effects of fatigue. Though music listening has been established as a distractor in the sense that it increases cognitive load during driving, it is possible that increased cognitive load is desirable under particular circumstances. For instance, during situations that typically result in cognitive underload, such as driving in a low-traffic monotonous stretch of highway, it may be beneficial for cognitive load to increase, thereby necessitating allocation of greater cognitive resources to the task of driving and attenuating fatigue...
September 16, 2017: Accident; Analysis and Prevention
https://www.readbyqxmd.com/read/28925730/impact-of-frequent-interruption-on-nurses-patient-controlled-analgesia-programming-performance
#10
Kristi R Campoe, Karen K Giuliano
OBJECTIVE: The purpose was to add to the body of knowledge regarding the impact of interruption on acute care nurses' cognitive workload, total task completion times, nurse frustration, and medication administration error while programming a patient-controlled analgesia (PCA) pump. BACKGROUND: Data support that the severity of medication administration error increases with the number of interruptions, which is especially critical during the administration of high-risk medications...
September 1, 2017: Human Factors
https://www.readbyqxmd.com/read/28923143/validation-of-the-cognition-test-battery-for-spaceflight-in-a-sample-of-highly-educated-adults
#11
Tyler M Moore, Mathias Basner, Jad Nasrini, Emanuel Hermosillo, Sushila Kabadi, David R Roalf, Sarah McGuire, Adrian J Ecker, Kosha Ruparel, Allison M Port, Chad T Jackson, David F Dinges, Ruben C Gur
BACKGROUND: Neuropsychological changes that may occur due to the environmental and psychological stressors of prolonged spaceflight motivated the development of the Cognition Test Battery. The battery was designed to assess multiple domains of neurocognitive functions linked to specific brain systems. Tests included in Cognition have been validated, but not in high-performing samples comparable to astronauts, which is an essential step toward ensuring their usefulness in long-duration space missions...
October 1, 2017: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/28923083/prevention-of-c5ar1-signaling-delays-microglial-inflammatory-polarization-favors-clearance-pathways-and-suppresses-cognitive-loss
#12
Michael X Hernandez, Shan Jiang, Tracy A Cole, Shu-Hui Chu, Maria I Fonseca, Melody J Fang, Lindsay A Hohsfield, Maria D Torres, Kim N Green, Rick A Wetsel, Ali Mortazavi, Andrea J Tenner
BACKGROUND: Pharmacologic inhibition of C5aR1, a receptor for the complement activation proinflammatory fragment, C5a, suppressed pathology and cognitive deficits in Alzheimer's disease (AD) mouse models. To validate that the effect of the antagonist was specifically via C5aR1 inhibition, mice lacking C5aR1 were generated and compared in behavior and pathology. In addition, since C5aR1 is primarily expressed on cells of the myeloid lineage, and only to a lesser extent on endothelial cells and neurons in brain, gene expression in microglia isolated from adult brain at multiple ages was compared across all genotypes...
September 18, 2017: Molecular Neurodegeneration
https://www.readbyqxmd.com/read/28921380/relationship-between-drug-burden-and-physical-and-cognitive-functions-in-a-sample-of-nursing-home-patients-with-dementia
#13
L M J Sanders, T Hortobágyi, G van Staveren, K Taxis, F Boersma, H C Klein, W J R Bossers, C G Blankevoort, E J A Scherder, E A Van der Zee, M J G van Heuvelen
PURPOSE: The Drug Burden Index (DBI) is a tool to quantify the anticholinergic and sedative load of drugs. Establishing functional correlates of the DBI could optimize drug prescribing in patients with dementia. In this cross-sectional study, we determined the relationship between DBI and cognitive and physical functions in a sample of patients with dementia. METHODS: Using performance-based tests, we measured physical and cognitive functions in 140 nursing home patients aged over 70 with all-cause dementia...
September 18, 2017: European Journal of Clinical Pharmacology
https://www.readbyqxmd.com/read/28919871/investigating-the-neural-correlates-of-emotion-cognition-interaction-using-an-affective-stroop-task
#14
Nora M Raschle, Lynn V Fehlbaum, Willeke M Menks, Felix Euler, Philipp Sterzer, Christina Stadler
The human brain has the capacity to integrate various sources of information and continuously adapts our behavior according to situational needs in order to allow a healthy functioning. Emotion-cognition interactions are a key example for such integrative processing. However, the neuronal correlates investigating the effects of emotion on cognition remain to be explored and replication studies are needed. Previous neuroimaging studies have indicated an involvement of emotion and cognition related brain structures including parietal and prefrontal cortices and limbic brain regions...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28918752/correlation-of-csf-flow-using-phase-contrast-mri-with-ventriculomegaly-and-csf-opening-pressure-in-mucopolysaccharidoses
#15
Amauri Dalla Corte, Carolina F M de Souza, Maurício Anés, Fabio K Maeda, Armelle Lokossou, Leonardo M Vedolin, Maria Gabriela Longo, Monica M Ferreira, Solanger G P Perrone, Olivier Balédent, Roberto Giugliani
BACKGROUND: Very little is known about the incidence and prevalence of hydrocephalus in patients with mucopolysaccharidoses (MPS). The biggest challenge is to distinguish communicating hydrocephalus from ventricular dilatation secondary to brain atrophy, because both conditions share common clinical and neuroradiological features. The main purpose of this study is to assess the relationship between ventriculomegaly, brain and cerebrospinal fluid (CSF) volumes, aqueductal and cervical CSF flows, and CSF opening pressure in MPS patients, and to provide potential biomarkers for abnormal CSF circulation...
September 18, 2017: Fluids and Barriers of the CNS
https://www.readbyqxmd.com/read/28918243/homeostatic-systems-biocybernetics-and-autonomic-neuroscience
#16
REVIEW
David S Goldstein, Irwin J Kopin
In this review we describe a series of major concepts introduced during the past 150years that have contributed to our current understanding about how physiological processes required for well-being and survival are regulated. One can theorize that hierarchical networks involving input-output relationships continuously orchestrate and learn adaptive patterns of observable behaviors, cognition, memory, mood, and autonomic systems. Taken together, these networks function as "good regulators" determining levels of internal variables and act as if there were homeostatic comparators ("homeostats")...
September 5, 2017: Autonomic Neuroscience: Basic & Clinical
https://www.readbyqxmd.com/read/28915780/cognitive-load-reduces-perceived-linguistic-convergence-between-dyads
#17
Jennifer Abel, Molly Babel
Speech convergence is the tendency of talkers to become more similar to someone they are listening or talking to, whether that person is a conversational partner or merely a voice heard repeating words. To elucidate the nature of the mechanisms underlying convergence, this study uses different levels of task difficulty on speech convergence within dyads collaborating on a task. Dyad members had to build identical LEGO® constructions without being able to see each other's construction, and with each member having half of the instructions required to complete the construction...
September 2017: Language and Speech
https://www.readbyqxmd.com/read/28914803/achieving-congestion-mitigation-using-distributed-power-control-for-spectrum-sensor-nodes-in-sensor-network-aided-cognitive-radio-ad-hoc-networks
#18
Long Zhang, Haitao Xu, Fan Zhuo, Hucai Duan
The data sequence of spectrum sensing results injected from dedicated spectrum sensor nodes (SSNs) and the data traffic from upstream secondary users (SUs) lead to unpredictable data loads in a sensor network-aided cognitive radio ad hoc network (SN-CRN). As a result, network congestion may occur at a SU acting as fusion center when the offered data load exceeds its available capacity, which degrades network performance. In this paper, we present an effective approach to mitigate congestion of bottlenecked SUs via a proposed distributed power control framework for SSNs over a rectangular grid based SN-CRN, aiming to balance resource load and avoid excessive congestion...
September 15, 2017: Sensors
https://www.readbyqxmd.com/read/28912896/investigation-of-the-safety-of-focused-ultrasound-induced-blood-brain-barrier-opening-in-a-natural-canine-model-of-aging
#19
Meaghan Anne O'Reilly, Ryan Matthew Jones, Edward Barrett, Anthony Schwab, Elizabeth Head, Kullervo Hynynen
Rationale: Ultrasound-mediated opening of the Blood-Brain Barrier(BBB) has shown exciting potential for the treatment of Alzheimer's disease(AD). Studies in transgenic mouse models have shown that this approach can reduce plaque pathology and improve spatial memory. Before clinical translation can occur the safety of the method needs to be tested in a larger brain that allows lower frequencies be used to treat larger tissue volumes, simulating clinical situations. Here we investigate the safety of opening the BBB in half of the brain in a large aged animal model with naturally occurring amyloid deposits...
2017: Theranostics
https://www.readbyqxmd.com/read/28906375/correlations-between-clinical-characteristics-and-neuroimaging-in-chinese-patients-with-subtypes-of-frontotemporal-lobe-degeneration
#20
Zhihong Shi, Shuai Liu, Ying Wang, Shuling Liu, Tong Han, Li Cai, Yuying Zhou, Shuo Gao, Yong Ji
The aim of the study was to obtain an overview of the clinical and neuroimaging features of Chinese patients with subtypes of frontotemporal lobe degeneration (FTLD).We evaluated the demographic features, clinical presentation, and lobe atrophy depicted by magnetic resonance imaging (MRI) in 133 patients with FTLD. Two positron emission tomography (PET) scans were performed at baseline: [C]Pittsburgh compound B PET to assess amyloid-β plaque load and [F]fluorodeoxyglucose (FDG) PET to assess glucose metabolism...
September 2017: Medicine (Baltimore)
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