keyword
MENU ▼
Read by QxMD icon Read
search

N-back

keyword
https://www.readbyqxmd.com/read/28645018/take-over-performance-in-evasive-manoeuvres
#1
Riender Happee, Christian Gold, Jonas Radlmayr, Sebastian Hergeth, Klaus Bengler
We investigated after effects of automation in take-over scenarios in a high-end moving-base driving simulator. Drivers performed evasive manoeuvres encountering a blocked lane in highway driving. We compared the performance of drivers 1) during manual driving, 2) after automated driving with eyes on the road while performing the cognitively demanding n-back task, and 3) after automated driving with eyes off the road performing the visually demanding SuRT task. Both minimum time to collision (TTC) and minimum clearance towards the obstacle disclosed a substantial number of near miss events and are regarded as valuable surrogate safety metrics in evasive manoeuvres...
June 20, 2017: Accident; Analysis and Prevention
https://www.readbyqxmd.com/read/28624581/polygenic-risk-for-depression-and-the-neural-correlates-of-working-memory-in-healthy-subjects
#2
Dilara Yüksel, Bruno Dietsche, Andreas J Forstner, Stephanie H Witt, Robert Maier, Marcella Rietschel, Carsten Konrad, Markus M Nöthen, Udo Dannlowski, Bernhard T Baune, Tilo Kircher, Axel Krug
INTRODUCTION: Major depressive disorder (MDD) patients show impairments of cognitive functioning such as working memory (WM), and furthermore alterations during WM-fMRI tasks especially in frontal and parietal brain regions. The calculation of a polygenic risk score (PRS) can be used to describe the genetic influence on MDD, hence imaging genetic studies aspire to combine both genetics and neuroimaging data to identify the influence of genetic factors on brain functioning. We aimed to detect the effect of MDD-PRS on brain activation during a WM task measured with fMRI and expect healthy individuals with a higher PRS to be more resembling to MDD patients...
June 14, 2017: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/28594238/on-the-selection-of-stimulus-for-the-auditory-variant-of-the-detection-response-task-method-for-driving-experiments
#3
Kristina Stojmenova, Franco Policardi, Jaka Sodnik
OBJECTIVES: The Detection Response Task (DRT) is a method for measuring attentional effects of secondary tasks on a driver's cognitive load by measuring response times and hit rates to different types of stimuli as indirect indicators of increased cognitive load. ISO 17488 (2016) standard only provides guidelines for the technical implementation and measurement methods for the visual and tactile versions (use of visual and tactile stimuli) of the DRT method. This paper presents a study with the goal of finding the most appropriate auditory stimulus for the implementation of an auditory version of the DRT method...
June 8, 2017: Traffic Injury Prevention
https://www.readbyqxmd.com/read/28583454/functional-connectivity-in-the-fronto-parietal-network-an-indicator-of-pre-operative-cognitive-function-and-cognitive-outcome-following-surgery-in-patients-with-glioma
#4
Stefan Lang, Ismael Gaxiola-Valdez, Michael Opoku-Darko, Lisa A Partlo, Bradley G Goodyear, John J P Kelly, Paolo Federico
BACKGROUND: Patients with diffuse glioma are known to have impaired cognitive functions pre-operatively. However, the mechanism of these cognitive deficits remains unclear. Resting state functional connectivity in the fronto-parietal network (FPN) is associated with cognitive performance in healthy subjects. For this reason, it was hypothesized that functional connectivity of the FPN would be related to cognitive functioning in patients with glioma. To assess this relationship, pre-operative cognitive status was correlated to patient specific connectivity within the FPN...
June 2, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28578155/prefrontal-parietal-effective-connectivity-during-working-memory-in-older-adults
#5
Stephan Heinzel, Robert C Lorenz, Quynh-Lam Duong, Michael A Rapp, Lorenz Deserno
Theoretical models and preceding studies have described age-related alterations in neuronal activation of frontoparietal regions in a working memory (WM) load-dependent manner. However, to date, underlying neuronal mechanisms of these WM load-dependent activation changes in aging remain poorly understood. The aim of this study was to investigate these mechanisms in terms of effective connectivity by application of dynamic causal modeling with Bayesian Model Selection. Eighteen healthy younger (age: 20-32 years) and 32 older (60-75 years) participants performed an n-back task with 3 WM load levels during functional magnetic resonance imaging (fMRI)...
May 10, 2017: Neurobiology of Aging
https://www.readbyqxmd.com/read/28567013/the-effect-of-apolipoprotein-e-%C3%AE%C2%B54-apoe-%C3%AE%C2%B54-on-visuospatial-working-memory-in-healthy-elderly-and-amnestic-mild-cognitive-impairment-patients-an-event-related-potentials-study
#6
Li-Hua Gu, Jiu Chen, Li-Juan Gao, Hao Shu, Zan Wang, Duan Liu, Yan-Na Yan, Shi-Jiang Li, Zhi-Jun Zhang
Background: Apolipoprotein E (APOE) ε4 is the only established risk gene for late-onset, sporadic Alzheimer's disease (AD). Previous studies have provided inconsistent evidence for the effect of APOE ε4 status on the visuospatial working memory (VSWM). Objective: The aim was to investigate the effect of APOE ε4 on VSWM with an event-related potential (ERP) study in healthy controls (HC) and amnestic mild cognitive impairment (aMCI) patients. Methods: The study recorded 39 aMCI patients (27 APOE ε4 non-carriers and 12 APOE ε4 carriers) and their 43 matched controls (25 APOE ε4 non-carriers and 18 APOE ε4 carriers) with an 64-channel electroencephalogram...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28558859/acute-memory-and-psychotomimetic-effects-of-cannabis-and-tobacco-both-joint-and-individually-a-placebo-controlled-trial
#7
C Hindocha, T P Freeman, J X Xia, N D C Shaban, H V Curran
BACKGROUND: Cannabis and tobacco have contrasting cognitive effects. Smoking cannabis with tobacco is prevalent in many countries and although this may well influence cognitive and mental health outcomes, the possibility has rarely been investigated in human experimental psychopharmacological research. METHOD: The individual and interactive effects of cannabis and tobacco were evaluated in 24 non-dependent cannabis and tobacco smokers in a randomized, placebo-controlled, double-blind, 2 (cannabis, placebo) × 2 (tobacco, placebo) crossover design...
May 31, 2017: Psychological Medicine
https://www.readbyqxmd.com/read/28553215/eeg-cortical-connectivity-analysis-of-working-memory-reveals-topological-reorganization-in-theta-and-alpha-bands
#8
Zhongxiang Dai, Joshua de Souza, Julian Lim, Paul M Ho, Yu Chen, Junhua Li, Nitish Thakor, Anastasios Bezerianos, Yu Sun
Numerous studies have revealed various working memory (WM)-related brain activities that originate from various cortical regions and oscillate at different frequencies. However, multi-frequency band analysis of the brain network in WM in the cortical space remains largely unexplored. In this study, we employed a graph theoretical framework to characterize the topological properties of the brain functional network in the theta and alpha frequency bands during WM tasks. Twenty-eight subjects performed visual n-back tasks at two difficulty levels, i...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28546139/cognitive-testing-in-people-at-increased-risk-of-dementia-using-a-smartphone-app-the-ivitality-proof-of-principle-study
#9
Susan Jongstra, Liselotte Willemijn Wijsman, Ricardo Cachucho, Marieke Peternella Hoevenaar-Blom, Simon Pieter Mooijaart, Edo Richard
BACKGROUND: Smartphone-assisted technologies potentially provide the opportunity for large-scale, long-term, repeated monitoring of cognitive functioning at home. OBJECTIVE: The aim of this proof-of-principle study was to evaluate the feasibility and validity of performing cognitive tests in people at increased risk of dementia using smartphone-based technology during a 6 months follow-up period. METHODS: We used the smartphone-based app iVitality to evaluate five cognitive tests based on conventional neuropsychological tests (Memory-Word, Trail Making, Stroop, Reaction Time, and Letter-N-Back) in healthy adults...
May 25, 2017: JMIR MHealth and UHealth
https://www.readbyqxmd.com/read/28544426/the-catechol-o-methyltransferase-comt-val158met-genotype-modulates-working-memory-related-dorsolateral-prefrontal-response-and-performance-in-bipolar-disorder
#10
K W Miskowiak, H L Kjaerstad, M M Støttrup, A M Svendsen, K M Demant, L K Hoeffding, T M Werge, K E Burdick, K Domschke, A F Carvalho, E Vieta, M Vinberg, L V Kessing, H R Siebner, J Macoveanu
OBJECTIVES: Cognitive dysfunction affects a substantial proportion of patients with bipolar disorder (BD), and genetic-imaging paradigms may aid in the elucidation of mechanisms implicated in this symptomatic domain. The Val allele of the functional Val158Met polymorphism of the catechol-O-methyltransferase (COMT) gene is associated with reduced prefrontal cortex dopamine and exaggerated working memory-related prefrontal activity. This functional magnetic resonance imaging (fMRI) study investigated for the first time whether the COMT Val158Met genotype modulates prefrontal activity during spatial working memory in BD...
May 2017: Bipolar Disorders
https://www.readbyqxmd.com/read/28533517/vortioxetine-reduces-bold-signal-during-performance-of-the-n-back-working-memory-task-a-randomised-neuroimaging-trial-in-remitted-depressed-patients-and-healthy-controls
#11
J Smith, M Browning, S Conen, R Smallman, J Buchbjerg, K G Larsen, C K Olsen, S R Christensen, G R Dawson, J F Deakin, P Hawkins, R Morris, G Goodwin, C J Harmer
Cognitive dysfunction is common in depression during both acute episodes and remission. Vortioxetine is a novel multimodal antidepressant that has improved cognitive function including executive function in depressed patients in randomised placebo-controlled clinical trials. However, it is unclear whether vortioxetine is able to target directly the neural circuitry implicated in the cognitive deficits in depression. Remitted depressed (n=48) and healthy volunteers (n=48) were randomised to receive 14 days treatment with 20 mg vortioxetine or placebo in a double-blind design...
May 23, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28528773/apoe-moderates-compensatory-recruitment-of-neuronal-resources-during-working-memory-processing-in-healthy-older-adults
#12
Elisa Scheller, Jessica Peter, Lena V Schumacher, Jacob Lahr, Irina Mader, Christoph P Kaller, Stefan Klöppel
The APOE ε4 allele increases the risk for sporadic Alzheimer's disease and modifies brain activation patterns of numerous cognitive domains. We assessed cognitively intact older adults with a letter n-back task to determine if previously observed increases in ε4 carriers' working-memory-related brain activation are compensatory such that they serve to maintain working memory function. Using multiple regression models, we identified interactions of APOE variant and age in bilateral hippocampus independently from task performance: ε4 carriers only showed a decrease in activation with increasing age, suggesting high sensitivity of fMRI data for detecting changes in Alzheimer's disease-relevant brain areas before cognitive decline...
April 26, 2017: Neurobiology of Aging
https://www.readbyqxmd.com/read/28505961/effects-of-dual-task-conditions-on-cervical-spine-movement-variability
#13
Daniel Niederer, Lutz Vogt, Johanna Vogel, Winfried Banzer
BACKGROUND: The potential to accurately perform cervical movements during more challenging tasks might be of importance to prevent dysfunctional motion characteristics. Although sensorimotor function during dual-task conditions are of increasing interest in biomedical and rehabilitation research, effects of such conditions on movement consistency of the neck have not yet been investigated. OBJECTIVE: In this crossover MiSpEx(Medicine in Spine Exercise)-diagnostic study, we aimed to explore differences between single and dual-task conditions on cervical movement variability...
May 5, 2017: Journal of Back and Musculoskeletal Rehabilitation
https://www.readbyqxmd.com/read/28489539/task-independent-mental-workload-classification-based-upon-common-multi-band-eeg-cortical-connectivity
#14
Georgios Dimitrakopoulos, Ioannis Kakkos, Zhongxiang Dai, Julian Lim, Joshua deSouza, Anastasios Bezerianos, Yu Sun
Efficient classification of mental workload, an important issue in neuroscience, is limited so far to single task, while cross-task classification remains a challenge. Furthermore, network approaches have emerged as a promising direction for studying the complex organization of the brain, enabling easier interpretation of various mental states. In this study, using two mental tasks (N-back and mental arithmetic), we present a framework for cross- as well as within-task workload discrimination by utilizing multiband EEG cortical brain connectivity...
May 4, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28471296/map-learning-and-working-memory-multimodal-learning-strategies
#15
Matthew James Knight, Michael Tlauka
The current research investigated whether learning spatial information from a map involves different modalities, which are managed by discrete components in working memory. In four experiments, participants studied a map either while performing a simultaneous interference task (high cognitive load) or without interference (low cognitive load). The modality of interference varied between experiments. Experiment 1 used a tapping task (visuospatial), Experiment 2 a backwards counting task (verbal), Experiment 3 an articulatory suppression task (verbal) and Experiment 4 an n-back task (central executive)...
May 4, 2017: Quarterly Journal of Experimental Psychology: QJEP
https://www.readbyqxmd.com/read/28466438/a-mechanistic-cohort-study-evaluating-cognitive-impairment-in-women-treated-for-breast-cancer
#16
Janette L Vardy, Myrle M Stouten-Kemperman, Gregory Pond, Christopher M Booth, Sean B Rourke, Haryana M Dhillon, Anna Dodd, Adrian Crawley, Ian F Tannock
Some women report cognitive impairment after adjuvant chemotherapy (CTh) for breast cancer. Here we explore cognitive function, and underlying mechanisms with blood tests and functional magnetic resonance imaging (fMRI). Women treated for early breast cancer were recruited to three groups based on self-reported cognitive symptoms (CS) using FACT-Cog scores. CTh + CS+ (n = 44) had received chemotherapy and self-reported cognitive symptoms; CTh + CS- (n = 52) had chemotherapy but did not report cognitive problems; CTh- (n = 30) had not received chemotherapy...
May 2, 2017: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/28462484/media-multitasking-and-implicit-learning
#17
Kathleen S Edwards, Myoungju Shin
Media multitasking refers to the simultaneous use of different forms of media. Previous research comparing heavy media multitaskers and light media multitaskers suggests that heavy media multitaskers have a broader scope of attention. The present study explored whether these differences in attentional scope would lead to a greater degree of implicit learning for heavy media multitaskers. The study also examined whether media multitasking behaviour is associated with differences in visual working memory, and whether visual working memory differentially affects the ability to process contextual information...
May 1, 2017: Attention, Perception & Psychophysics
https://www.readbyqxmd.com/read/28458633/event-related-potentials-altered-in-patients-with-borderline-personality-disorder-during-working-memory-tasks
#18
Ying Liu, Mingtian Zhong, Chang Xi, Xinhu Jin, Xiongzhao Zhu, Shuqiao Yao, Jinyao Yi
Whereas some studies have demonstrated impaired working memory (WM) among patients with borderline personality disorder (BPD), these findings have not been consistent. Furthermore, there is a lack of neurophysiological evidence about WM function in patients with BPD. The goal of this study was to examine WM function in patients with BPD by using event-related potentials (ERPs). An additional goal was to explore whether characteristics of BPD (i.e., impulsiveness and emotional instability) are associated with WM impairment...
2017: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/28456880/altered-segregation-between-task-positive-and-task-negative-regions-in-mild-traumatic-brain-injury
#19
Chandler Sours, Joshua Kinnison, Srikanth Padmala, Rao P Gullapalli, Luiz Pessoa
Changes in large-scale brain networks that accompany mild traumatic brain injury (mTBI) were investigated using functional magnetic resonance imaging (fMRI) during the N-back working memory task at two cognitive loads (1-back and 2-back). Thirty mTBI patients were examined during the chronic stage of injury and compared to 28 control participants. Demographics and behavioral performance were matched across groups. Due to the diffuse nature of injury, we hypothesized that there would be an imbalance in the communication between task-positive and Default Mode Network (DMN) regions in the context of effortful task execution...
April 29, 2017: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/28449077/executive-network-activation-is-linked-to-walking-speed-in-older-adults-functional-mri-and-tcd-ultrasound-evidence-from-the-mobilize-boston-study
#20
Azizah J Jor'dan, Victoria N Poole, Ikechukwu Iloputaife, William Milberg, Brad Manor, Michael Esterman, Lewis A Lipsitz
Background: Changes in cerebral blood flow velocity (CBF) in response to a cognitive task (task-related ΔCBF) have been shown by Transcranial Doppler ultrasonography (TCD) to be reduced in slow walkers. However, it is unknown whether reduced task-related ΔCBF is associated with reduced neural activity in specific brain regions, as measured by blood-oxygen-level dependent (BOLD) functional magnetic resonance imaging (fMRI). Methods: We assessed the regional changes in neural activity associated with reduced middle cerebral artery (MCA) task-related ΔCBF to an executive task and slow walking speed in 67 community-dwelling older adults from the MOBILIZE Boston Study...
April 26, 2017: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
keyword
keyword
71744
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"