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Cognitive Load

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https://www.readbyqxmd.com/read/28101695/the-spatial-release-of-cognitive-load-in-cocktail-party-is-determined-by-the-relative-levels-of-the-talkers
#1
Guillaume Andéol, Clara Suied, Sébastien Scannella, Frédéric Dehais
In a multi-talker situation, spatial separation between talkers reduces cognitive processing load: this is the "spatial release of cognitive load". The present study investigated the role played by the relative levels of the talkers on this spatial release of cognitive load. During the experiment, participants had to report the speech emitted by a target talker in the presence of a concurrent masker talker. The spatial separation (0° and 120° angular distance in azimuth) and the relative levels of the talkers (adverse, intermediate, and favorable target-to-masker ratio) were manipulated...
January 18, 2017: Journal of the Association for Research in Otolaryngology: JARO
https://www.readbyqxmd.com/read/28101099/magnetic-resonance-volumetry-prediction-of-subjective-memory-complaints-and-mild-cognitive-impairment-and-associations-with-genetic-and-cardiovascular-risk-factors
#2
Sigbjørn Rogne, Torgil Vangberg, Petter Eldevik, Gry Wikran, Ellisiv B Mathiesen, Henrik Schirmer
BACKGROUND/AIMS: Subjective memory complaints (SMC) are strong predictors of mild cognitive impairment (MCI) and subsequent Alzheimer's disease. Our aims were to see if fully automated cerebral MR volume measurements could distinguish subjects with SMC and MCI from controls, and if probable parental late-onset Alzheimer's disease (LOAD), apolipoprotein E ε4 genotype, total plasma homocysteine, and cardiovascular risk factors were associated with MR volumetric findings. METHODS: 198 stroke-free subjects comprised the control (n = 58), the SMC (n = 25) and the MCI (n = 115) groups...
September 2016: Dementia and Geriatric Cognitive Disorders Extra
https://www.readbyqxmd.com/read/28100405/dynamic-hilbert-warping-a-new-measure-of-rr-interval-signals-evaluated-in-the-cognitive-load-estimation
#3
Peyvand Ghaderyan, Ataollah Abbasi
RR interval (RRI) signals represent the time intervals between successive heart R-waves. These signals are influenced by many cognitive and psychological processes. In this study, a new technique based on the combination of empirical mode decomposition and dynamic Hilbert warping (DHW) was proposed to inference cognitive states from measured RRI signals. Moreover, a set of entropic and statistical measures was extracted to characterize the regularity and temporal distribution in the phase spectra and amplitude envelope of the analytic signals...
January 16, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28089970/spatial-working-memory-impairment-in-patients-with-non-neuropsychiatric-systemic-lupus-erythematosus-a-blood-oxygen-level-dependent-functional-magnetic-resonance-imaging-study
#4
Chun-Min Zhu, Ye Ma, Lei Xie, Jin-Zhuang Huang, Zong-Bo Sun, Shou-Xing Duan, Zhi-Rong Lin, Jing-Jing Yin, Hong-Bo Le, Dan-Miao Sun, Wen-Can Xu, Shu-Hua Ma
OBJECTIVE: Using ethology and functional magnetic resonance imaging (fMRI) to explore mild cognitive dysfunction and spatial working memory (WM) impairment in patients with systemic lupus erythematosus (SLE) without overt neuropsychiatric symptoms (non-NPSLE) and to study whether any clinical biomarkers could serve as predictors of brain dysfunction in this disease. METHODS: Eighteen non-NPSLE patients and 18 matched subjects were all tested using the Montreal cognitive assessment scale test and scanned using blood-oxygen-level dependent fMRI while performing the n-back task to investigate the activation intensity of some cognition-related areas...
January 15, 2017: Journal of Rheumatology
https://www.readbyqxmd.com/read/28089758/pupil-responses-and-pain-ratings-to-heat-stimuli-reliability-and-effects-of-expectations-and-a-conditioning-pain-stimulus
#5
James C Eisenach, Regina Curry, Carol A Aschenbrenner, Robert C Coghill, Timothy T Houle
BACKGROUND: The locus coeruleus (LC) signals salience to sensory stimuli and these responses can modulate the experience of pain stimuli. The pupil dilation response (PDR) to noxious stimuli is thought to be a surrogate for LC responses, but PDR response to Peltier-controlled noxious heat stimuli, the most commonly used method in experimental pain research, has not been described. NEW METHOD: Healthy volunteers were presented with randomly presented heat stimuli of 5 sec duration and provided pain intensity ratings to each stimulus...
January 12, 2017: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/28089557/lower-total-and-regional-grey-matter-brain-volumes-in-youth-with-perinatally-acquired-hiv-infection-associations-with-hiv-disease-severity-substance-use-and-cognition
#6
C Paula Lewis-De Los Angeles, Paige L Williams, Yanling Huo, Shirlene D Wang, Kristina A Uban, Megan M Herting, Kathleen Malee, Ram Yogev, John G Csernansky, Sharon Nichols, Russell B Van Dyke, Elizabeth R Sowell, Lei Wang
Despite improved survival due to combination antiretroviral therapy (cART), youth with perinatally-acquired HIV (PHIV) show cognitive deficits and developmental delay at increased rates. HIV affects the brain during critical periods of development, and the brain may be a persistent reservoir for HIV due to suboptimal blood brain barrier penetration of cART. We conducted structural magnetic resonance imaging (sMRI) and cognitive testing in 40 PHIV youth (mean age=16.7 years) recruited from the NIH Pediatric HIV/AIDS Cohort Study (PHACS) who are part of the first generation of PHIV youth surviving into adulthood...
January 9, 2017: Brain, Behavior, and Immunity
https://www.readbyqxmd.com/read/28088527/navigation-in-the-electronic-health-record-a-review-of-the-safety-and-usability-literature
#7
REVIEW
Lisette C Roman, Jessica S Ancker, Stephen B Johnson, Yalini Senathirajah
OBJECTIVE: Inefficient navigation in electronic health records has been shown to increase users' cognitive load, which may increase potential for errors, reduce efficiency, and increase fatigue. However, navigation has received insufficient recognition and attention in the electronic health record (EHR) literature as an independent construct and contributor to overall usability. Our aims in this literature review were to (1) assess the prevalence of navigation-related topics within the EHR usability and safety research literature, (2) categorize types of navigation actions within the EHR, (3) capture relationships between these navigation actions and usability principles, and (4) collect terms and concepts related to EHR navigation...
January 11, 2017: Journal of Biomedical Informatics
https://www.readbyqxmd.com/read/28080262/processing-speed-test-validation-of-a-self-administered-ipad-%C3%A2-based-tool-for-screening-cognitive-dysfunction-in-a-clinic-setting
#8
Stephen M Rao, Genna Losinski, Lyla Mourany, David Schindler, Bernadett Mamone, Christine Reece, Danielle Kemeny, Sridar Narayanan, Deborah M Miller, Francois Bethoux, Robert A Bermel, Richard Rudick, Jay Alberts
BACKGROUND: Cognitive dysfunction is common in multiple sclerosis (MS) patients and has important consequences for daily activities, yet, unlike motor function, is not routinely assessed in the clinic setting. We developed the Processing Speed Test (PST), a self-administered iPad(®)-based tool to measure MS-related deficits in processing speed. OBJECTIVE: To determine whether the PST is valid for screening cognitive dysfunction by comparing it to the paper-and-pencil Symbol Digit Modalities Test (SDMT)...
January 1, 2017: Multiple Sclerosis: Clinical and Laboratory Research
https://www.readbyqxmd.com/read/28077166/threonine-175-a-novel-pathological-phosphorylation-site-on-tau-protein-linked-to-multiple-tauopathies
#9
Alexander J Moszczynski, Wencheng Yang, Robert Hammond, Lee Cyn Ang, Michael J Strong
Microtubule associated protein tau (tau) deposition is associated with a spectrum of neurodegenerative diseases collectively termed tauopathies. We have previously shown that amyotrophic lateral sclerosis (ALS) with cognitive impairment (ALSci) is associated with tau phosphorylation at Thr(175) and that this leads to activation of GSK3β which then induces phosphorylation at tau Thr(231). This latter step leads to dissociation of tau from microtubules and pathological tau fibril formation. To determine the extent to which this pathway is unique to ALS, we have investigated the expression of pThr(175) tau and pThr(231) tau across a range of frontotemporal degenerations...
January 11, 2017: Acta Neuropathologica Communications
https://www.readbyqxmd.com/read/28077002/pupil-size-behavior-during-on-line-processing-of-sentences
#10
G Fernández, J Biondi, S Castro, O Agamenonni
In the present work we analyzed the pupil size behavior of 40 subjects while they read well-defined sentences with different contextual predictability (i.e., regular sentences and proverbs). In general, pupil size increased when reading regular sentences, but when readers realized that they were reading proverbs their pupils strongly increase until finishing proverbs' reading. Our results suggest that an increased pupil size is not limited to cognitive load (i.e., relative difficulty in processing) because when participants accurately recognized words during reading proverbs, theirs pupil size increased too...
January 11, 2017: Journal of Integrative Neuroscience
https://www.readbyqxmd.com/read/28073606/load-dependent-hyperdeactivation-of-the-default-mode-network-in-people-with-schizophrenia
#11
Britta Hahn, Alexander N Harvey, James M Gold, Thomas J Ross, Elliot A Stein
Schizophrenia is associated with impairment in a range of cognitive functions. Neuroimaging studies have reported lower, but also higher, task-induced activation accompanying impaired performance. Differences in task-load and the ability of people with schizophrenia (PSZ) to stay engaged in the cognitive operations probed appear to underlie such discrepancies. Similarly, task-induced deactivation of the default mode network (DMN) was weaker in PSZ relative to healthy control subjects (HCS) in most studies, but some reported greater deactivation...
January 7, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28069930/a-quantitative-analysis-of-brain-soluble-tau-and-the-tau-secretion-factor
#12
Pengcheng Han, Geidy Serrano, Thomas G Beach, Richard J Caselli, Junxiang Yin, Ningning Zhuang, Jiong Shi
Neurofibrillary tangles (NFTs) represent products of insoluble tau protein in the brains of patients with Alzheimer disease (AD). The cerebrospinal fluid (CSF) tau level is a biomarker in AD diagnosis. The soluble portion of tau protein in brain parenchyma is presumably the source for CSF tau but this has not previously been quantified. We measured CSF tau and soluble brain tau at autopsy in temporal and frontal brain tissue samples from 7 cognitive normal, 12 mild cognitively impaired, and 19 AD subjects. Based on the measured brain soluble tau, we calculated the whole brain tau load and estimated tau secretion factor...
January 9, 2017: Journal of Neuropathology and Experimental Neurology
https://www.readbyqxmd.com/read/28068126/using-perspective-to-resolve-reference-the-impact-of-cognitive-load-and-motivation
#13
James E Cane, Heather J Ferguson, Ian A Apperly
Research has demonstrated a link between perspective taking and working memory. Here we used eye tracking to examine the time course with which working memory load (WML) influences perspective-taking ability in a referential communication task and how motivation to take another's perspective modulates these effects. In Experiment 1, where there was no reward or time pressure, listeners only showed evidence of incorporating perspective knowledge during integration of the target object but did not anticipate reference to this common ground object during the pretarget-noun period...
January 9, 2017: Journal of Experimental Psychology. Learning, Memory, and Cognition
https://www.readbyqxmd.com/read/28066703/how-common-are-wm-deficits-in-children-with-difficulties-in-reading-and-mathematics
#14
Susan E Gathercole, Francesca Woolgar, Rogier A Kievit, Duncan Astle, Tom Manly, Joni Holmes
The extent to which deficits in working memory (WM) are characteristic of children with reading and mathematics difficulties was investigated in a large sample aged 5-15 years reported to have problems in attention, learning and memory. WM performance was highly correlated with reading and mathematics scores. Although deficits in individual tests of short-term memory (STM) and WM occurred in less than half of the children with detected learning difficulties, three-quarters of the children with low reading and mathematics scores obtained one or more WM scores in the deficit range...
December 2016: Journal of Applied Research in Memory and Cognition
https://www.readbyqxmd.com/read/28066098/novel-strategies-for-alzheimer-s-disease-treatment-an-overview-of-anti-amyloid-beta-monoclonal-antibodies
#15
Katarzyna Rygiel
Alzheimer's disease (AD) is a multifactorial, progressive neurodegenerative disorder with a poor prognosis, and thus, novel therapies for AD are certainly needed in a growing population of elderly patients or asymptomatic individuals, who are at risk for AD, worldwide. It has been established that some AD biomarkers such as amyloid-beta load in the brain, precede the onset of the disease, by approximately 20 years. Therefore, the therapy to prevent or effectively treat AD has to be initiated before the emergence of symptoms...
November 2016: Indian Journal of Pharmacology
https://www.readbyqxmd.com/read/28063366/white-matter-lesions-relate-to-tract-specific-reductions-in-functional-connectivity
#16
Carolyn D Langen, Hazel I Zonneveld, Tonya White, Wyke Huizinga, Lotte G M Cremers, Marius de Groot, Mohammad Arfan Ikram, Wiro J Niessen, Meike W Vernooij
White matter lesions play a role in cognitive decline and dementia. One presumed pathway is through disconnection of functional networks. Little is known about location-specific effects of lesions on functional connectivity. This study examined location-specific effects within anatomically-defined white matter tracts in 1584 participants of the Rotterdam Study, aged 50-95. Tracts were delineated from diffusion magnetic resonance images using probabilistic tractography. Lesions were segmented on fluid-attenuated inversion recovery images...
December 14, 2016: Neurobiology of Aging
https://www.readbyqxmd.com/read/28062720/multimodal-characterization-of-older-apoe2-carriers-reveals-selective-reduction-of-amyloid-load
#17
Michel J Grothe, Sylvia Villeneuve, Martin Dyrba, David Bartrés-Faz, Miranka Wirth
OBJECTIVE: To comprehensively assess neurobiological effects of the protective APOE2 allele in the aged brain using a cross-sectional multimodal neuroimaging approach. METHODS: Multimodal neuroimaging data were obtained from a total of 572 older individuals without dementia (cognitively normal and mild cognitive impairment) enrolled in the Alzheimer's Disease Neuroimaging Initiative and included assessments of regional amyloid load with AV45-PET, glucose metabolism with fluorodeoxyglucose-PET, and gray matter volume with structural MRI...
January 6, 2017: Neurology
https://www.readbyqxmd.com/read/28062077/breakfast-and-behavior-in-morning-tasks-facts-or-fads
#18
REVIEW
Valeria Edefonti, Francesca Bravi, Monica Ferraroni
BACKGROUND: Most of the studies investigating the effects of breakfast on cognitive performance have compared performance in subjects who have or have not consumed this meal. However, characteristics of breakfast itself may influence mental abilities. Moreover, as far as the positive effects of having breakfast is more evident, research may focus on the specific characteristics of an adequate breakfast. METHODS: To update an existing systematic review, published at the beginning of 2014, on the role of nutrient composition and/or energy intake at breakfast on the accomplishment of school-related tasks and cognition, we carried out a systematic review of the literature through PUBMED database...
December 24, 2016: Journal of Affective Disorders
https://www.readbyqxmd.com/read/28060919/the-older-adult-positivity-effect-in-evaluations-of-trustworthiness-emotion-regulation-or-cognitive-capacity
#19
Leslie A Zebrowitz, Jasmine Boshyan, Noreen Ward, Angela Gutchess, Nouchine Hadjikhani
An older adult positivity effect, i.e., the tendency for older adults to favor positive over negative stimulus information more than do younger adults, has been previously shown in attention, memory, and evaluations. This effect has been attributed to greater emotion regulation in older adults. In the case of attention and memory, this explanation has been supported by some evidence that the older adult positivity effect is most pronounced for negative stimuli, which would motivate emotion regulation, and that it is reduced by cognitive load, which would impede emotion regulation...
2017: PloS One
https://www.readbyqxmd.com/read/28059027/cognitive-load-mediates-the-effect-of-emotion-on-analytical-thinking
#20
Bastien Trémolière, Marie-Ève Gagnon, Isabelle Blanchette
Although the detrimental effect of emotion on reasoning has been evidenced many times, the cognitive mechanism underlying this effect remains unclear. In the present paper, we explore the cognitive load hypothesis as a potential explanation. In an experiment, participants solved syllogistic reasoning problems with either neutral or emotional contents. Participants were also presented with a secondary task, for which the difficult version requires the mobilization of cognitive resources to be correctly solved...
November 2016: Experimental Psychology
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