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https://www.readbyqxmd.com/read/28226632/an-eeg-blind-source-separation-algorithm-based-on-a-weak-exclusion-principle
#1
Lan Ma, Thierry Blu, William S-Y Wang, Lan Ma, Thierry Blu, William S-Y Wang, Lan Ma, William S-Y Wang, Thierry Blu
The question of how to separate individual brain and non-brain signals, mixed by volume conduction in electroencephalographic (EEG) and other electrophysiological recordings, is a significant problem in contemporary neuroscience. This study proposes and evaluates a novel EEG Blind Source Separation (BSS) algorithm based on a weak exclusion principle (WEP). The chief point in which it differs from most previous EEG BSS algorithms is that the proposed algorithm is not based upon the hypothesis that the sources are statistically independent...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28224452/younger-and-older-adults-collaborative-recall-of-shared-and-unshared-emotional-pictures
#2
Sarah J Barber, Jaime J Castrellon, Philipp Opitz, Mara Mather
Although a group of people working together recalls more items than any one individual, they recall fewer unique items than the same number of people working apart whose responses are combined. This is known as collaborative inhibition, and it is a robust effect that occurs for both younger and older adults. However, almost all previous studies documenting collaborative inhibition have used stimuli that were neutral in emotional valence, low in arousal, and studied by all group members. In the current experiments, we tested the impact of picture-stimuli valence, picture-stimuli arousal, and information distribution in modulating the magnitude of collaborative inhibition...
February 21, 2017: Memory & Cognition
https://www.readbyqxmd.com/read/28222519/genetic-stratification-to-identify-risk-groups-for-alzheimer-s-disease
#3
Riccardo E Marioni, Archie Campbell, Saskia P Hagenaars, Reka Nagy, Carmen Amador, Caroline Hayward, David J Porteous, Peter M Visscher, Ian J Deary
Stratification by genetic risk factors for Alzheimer's disease (AD) may help identify groups with the greatest disease risk. Biological changes that cause late-onset AD are likely to occur years, if not decades prior to diagnosis. Here, we select a subset of the Generation Scotland: Scottish Family Health Study cohort in a likely preclinical age-range of 60-70 years (subset n = 3,495 with cognitive and genetic data). We test for cognitive differences by polygenic risk scores for AD. The polygenic scores are constructed using all available SNPs, excluding those within a 500 kb distance of the APOE locus...
February 10, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28222381/domain-specific-and-domain-general-processes-underlying-metacognitive-judgments
#4
Lisa M Fitzgerald, Mahnaz Arvaneh, Paul M Dockree
Metacognition and self-awareness are commonly assumed to operate as global capacities. However, there have been few attempts to test this assumption across multiple cognitive domains and metacognitive evaluations. Here, we assessed the covariance between "online" metacognitive processes, as measured by decision confidence judgments in the domains of perception and memory, and error awareness in the domain of attention to action. Previous research investigating metacognition across task domains have not matched stimulus characteristics across tasks raising the possibility that any differences in metacognitive accuracy may be influenced by local task properties...
February 17, 2017: Consciousness and Cognition
https://www.readbyqxmd.com/read/28219074/an-international-evaluation-of-cognitive-reserve-and-memory-changes-in-early-old-age-in-10-european-countries
#5
Dorina Cadar, Annie Robitaille, Sean Clouston, Scott M Hofer, Andrea M Piccinin, Graciela Muniz-Terrera
BACKGROUND: Cognitive reserve was postulated to explain individual differences in susceptibility to ageing, offering apparent protection to those with higher education. We investigated the association between education and change in memory in early old age. METHODS: Immediate and delayed memory scores from over 10,000 individuals aged 65 years and older, from 10 countries of the Survey of Health, Ageing and Retirement in Europe, were modeled as a function of time in the study over an 8-year period, fitting independent latent growth models...
February 21, 2017: Neuroepidemiology
https://www.readbyqxmd.com/read/28216430/white-matter-alterations-to-cingulum-and-fornix-following-very-preterm-birth-and-their-relationship-with-cognitive-functions
#6
Chiara Caldinelli, Seán Froudist-Walsh, Vyacheslav Karolis, Chieh-En Tseng, Matthew P Allin, Muriel Walshe, Marion Cuddy, Robin M Murray, Chiara Nosarti
Very preterm birth (VPT; <32 weeks of gestation) has been associated with impairments in memory abilities and functional neuroanatomical brain alterations in medial temporal and fronto-parietal areas. Here we investigated the relationship between structural connectivity in memory-related tracts and various aspects of memory in VPT adults (mean age 19) who sustained differing degrees of perinatal brain injury (PBI) as assessed by neonatal cerebral ultrasound. We showed that the neurodevelopmental consequences of VPT birth persist into young adulthood and are associated with neonatal cranial ultrasound classification...
February 12, 2017: NeuroImage
https://www.readbyqxmd.com/read/28215821/holistic-versus-feature-based-binding-in-the-medial-temporal-lobe
#7
Rebecca N van den Honert, Gregory McCarthy, Marcia K Johnson
A central question for cognitive neuroscience is how feature-combinations that give rise to episodic/source memories are encoded in the brain. Although there is much evidence that the hippocampus (HIP) is involved in feature binding, and some evidence that other brain regions are as well, there is relatively little evidence about the nature of the resulting representations in different brain regions. We used multivoxel pattern analysis (MVPA) to investigate how feature combinations might be represented, contrasting two possibilities, feature-based versus holistic...
January 23, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/28215553/organization-of-rescue-behaviour-sequences-in-ants-cataglyphis-cursor-reflects-goal-directedness-plasticity-and-memory
#8
Thierry Duhoo, Jean-Luc Durand, Karen L Hollis, Elise Nowbahari
The experimental study of rescue behaviour in ants, behaviour in which individuals help entrapped nestmates in distress, has revealed that rescuers respond to victims with very precisely targeted behaviour. In Cataglyphis cursor, several different components of rescue behaviour have been observed, demonstrating the complexity of this behaviour, including sand digging and sand transport to excavate the victim, followed by pulling on the victim's limbs as well as the object holding the victim in place, behaviour that serves to free the victim...
February 12, 2017: Behavioural Processes
https://www.readbyqxmd.com/read/28214051/effects-of-a-straw-phonation-protocol-on-acoustic-measures-of-an-satb-chorus-singing-two-contrasting-renaissance-works
#9
Jeremy N Manternach, Chad Clark, James F Daugherty
BACKGROUND: Researchers have found that semi-occluded vocal tract (SOVT) exercises may increase vocal economy by reducing phonation threshold pressure and effort while increasing or maintaining consistent acoustic output. This research has focused solely on individual singers. Much singing instruction, however, takes place in choral settings. Choral singers may use different resonance strategies or unconsciously adjust their singing based on the ability to hear their own sound in relation to others...
February 14, 2017: Journal of Voice: Official Journal of the Voice Foundation
https://www.readbyqxmd.com/read/28213445/ultra-high-field-fmri-reveals-a-role-for-the-subiculum-in-scene-perceptual-discrimination
#10
Carl J Hodgetts, Natalie L Voets, Adam G Thomas, Stuart Clare, Andrew D Lawrence, Kim S Graham
Recent 'representational' accounts suggest a key role for the hippocampus in complex scene perception. Due to limitations in scanner field strength, however, the functional neuroanatomy of hippocampal-dependent scene perception is unknown. Here, we applied 7-Tesla high-resolution functional magnetic resonance imaging (fMRI) alongside a perceptual oddity task, modified from non-human primate studies. This task requires subjects to discriminate highly similar scenes, faces or objects from multiple viewpoints, and has revealed selective impairments during scene discrimination following hippocampal lesions...
February 17, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28213444/the-dendrites-of-ca2-and-ca1-pyramidal-neurons-differentially-regulate-information-flow-in-the-cortico-hippocampal-circuit
#11
Kalyan V Srinivas, Eric W Buss, Qian Sun, Bina Santoro, Hiroto Takahashi, Daniel A Nicholson, Steven A Siegelbaum
The impact of a given neuronal pathway depends on the number of synapses it makes with its postsynaptic target, the strength of each individual synapse and the integrative properties of the postsynaptic dendrites. Here we explore the cellular and synaptic mechanisms responsible for the differential excitatory drive from the entorhinal cortical pathway onto mouse CA2 compared to CA1 pyramidal neurons (PNs). Although both types of neurons receive direct input from entorhinal cortex onto their distal dendrites, these inputs produce a 5-6 fold larger excitatory postsynaptic potential (EPSP) at the soma of CA2 compared to CA1 PNs, which is sufficient to drive action potential output from CA2 but not CA1...
February 17, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28213301/mental-retirement-and-health-selection-analyses-from-the-u-s-health-and-retirement-study
#12
Sean A P Clouston, Nicole Denier
BACKGROUND: Research has recently suggested that retirement may decrease cognitive engagement, resulting in cognitive aging. Few studies have systematically documented whether or how selectivity into retirement shapes the relationship between retirement and cognitive aging. METHODS: We draw on data from the Health and Retirement Study (1998-2012) to examine the relationship between cognition and retirement for 18,575 labor force participants. Longitudinal regression discontinuity modeling was used to examine performance and decline in episodic memory...
January 22, 2017: Social Science & Medicine
https://www.readbyqxmd.com/read/28210058/comparing-the-interface-pressure-redistribution-after-applying-three-different-types-of-cushions-differences-according-to-cushion-type
#13
Ji-Su Park, Sang-Heon Lee
[Purpose] The purpose of this study was to compare the interface pressure redistribution when sitting after applying three different types of cushions and on a firm surface in individuals in their 20s and those older than 60 years old. [Subjects and Methods] Healthy 100 elderly (60 years and older) subjects and 111 college students participated in this study. Interface pressure redistribution while sitting on a firm surface or honeycomb, air, and memory foam cushions, examined in that order. [Results] For all groups, significant differences were found in the total pressure mean among sitting states...
January 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28210039/comparing-the-interface-pressure-redistribution-of-three-different-types-of-cushions-differences-according-to-age-groups-and-cushion-preferences
#14
Ji-Su Park, Sang-Heon Lee
[Purpose] The purpose of this study was to analyze the change in interface pressure redistribution of three different types of cushions sat on by individuals in their 20s and older than 60 years old. [Subjects and Methods] One hundred and eleven college students and 100 persons than 60 years old were recruited. Sitting pressure redistribution was measured while subjects sat without cushions or on honeycomb, air, and memory foam cushions in that order. Subsequently, the cushion preference was measured. After obtaining all measurements, the mean total pressure and each quadrant's mean and peak pressure were analyzed...
January 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28208078/the-characteristic-of-cognitive-dysfunction-in-remitted-late-life-depression-and-amnestic-mild-cognitive-impairment
#15
Wenxiang Liao, Xiangrong Zhang, Hao Shu, Zan Wang, Duan Liu, ZhiJun Zhang
Remitted late life depression exhibits persistent cognitive impairments and enhances the risk of dementia. This study aimed to examine the characteristics of cognitive dysfunction in remitted late life depression and amnestic mild cognitive impairment (MCI). Remitted late life depression (n=61), amnestic MCI (n=61) and age-education-matched controls (n=65) were evaluated with a battery of neuropsychological tests grouped into executive function, memory, processing speed, attention and visuospatial domains. Compared with control subjects, amnestic MCI individuals showed more severe cognitive impairments in all domains, while remitted late life depression individuals performed worse in executive function and memory...
January 12, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/28207612/a-systematic-review-and-meta-analysis-of-executive-function-performance-in-type-1-diabetes-mellitus
#16
Melanie M Broadley, Melanie J White, Brooke Andrew
OBJECTIVE: To examine the current evidence for executive function (EF) performance differences between groups with Type 1 diabetes mellitus (T1DM) and non-diabetic control groups during adolescence and early adulthood, and to explore the relationships between EF and diabetes-related risk factors. METHODS: A systematic review of the literature examining EF performance in groups with T1DM was conducted according to the PRISMA guidelines. Electronic database searches for published and unpublished literature yielded a final set of 26 articles after application of inclusion and exclusion criteria...
February 16, 2017: Psychosomatic Medicine
https://www.readbyqxmd.com/read/28207604/memory-rehabilitation-strategies-in-nonsurgical-temporal-lobe-epilepsy-a-review
#17
Alessandra Del Felice, Marzia Alderighi, Matteo Martinato, Davide Grisafi, Anna Bosco, Pamela J Thompson, Josemir W Sander, Stefano Masiero
People with temporal lobe epilepsy (TLE) who have not undergone epilepsy surgery often complain of memory deficits. Cognitive rehabilitation is employed as a remedial intervention in clinical settings, but research is limited and findings concerning efficacy and the criteria for choosing different approaches have been inconsistent. We aimed to appraise existing evidence on memory rehabilitation in nonsurgical individuals with temporal lobe epilepsy and to ascertain the effectiveness of specific strategies. A scoping review was preferred given the heterogeneous nature of the interventions...
February 15, 2017: American Journal of Physical Medicine & Rehabilitation
https://www.readbyqxmd.com/read/28203633/individual-differences-predict-low-prevalence-visual-search-performance
#18
Chad Peltier, Mark W Becker
Critical real-world visual search tasks such as radiology and baggage screening rely on the detection of rare targets. When targets are rare, observers search for a relatively short amount of time and have a high miss rate, a pattern of results known as the low prevalence effect. Attempts to improve the search for rare targets have been unsuccessful or resulted in an increase in detections at the price of more false alarms. As an alternative to improving visual search performance through experimental manipulations, an individual differences approach found that those with higher working memory capacity were better at finding rare targets...
2017: Cogn Res Princ Implic
https://www.readbyqxmd.com/read/28202888/sarcopenia-and-its-relationship-with-falling-among-outpatients-attending-a-geriatric-and-memory-clinic-at-kyorin-university-hospital
#19
Masamichi Tanaka, Kumiko Nagai, Hitomi Koshiba, Toshifumi Matui, Koichi Kozaki
AIM: The aim of the present study was to investigate the prevalence of sarcopenia in outpatients attending a geriatric and memory clinic and to investigate its relationship with falling. METHODS: We investigated the prevalence of sarcopenia (according to the EWGSOP criteria) among 283 outpatients that were all ≥65 years of age, and who attended the geriatric and memory clinic at Kyorin University Hospital. We also examined comorbidities, CGA items, and fall-related measures, and analyzed the relationships between these factors and sarcopenia...
2017: Nihon Ronen Igakkai Zasshi. Japanese Journal of Geriatrics
https://www.readbyqxmd.com/read/28198539/cytomegalovirus-infection-alters-phenotypes-of-different-%C3%AE-%C3%AE-t-cell-subsets-in-renal-transplant-recipients-with-long-term-stable-graft-function
#20
Silvia Lee, Jacquita S Affandi, Ashley B Irish, Patricia Price
Cytomegalovirus (CMV) infection alters the phenotypic profiles of T-cells and NK cells in healthy and immunocompromised individuals. Here, we examined the effects of CMV infection on the phenotype and functions of γδ T-cell subsets in renal transplant recipients (RTR) stable several years after transplantation (n = 80) and healthy controls (n = 72). Differentiation status, function, and expression of HLA-DR, CD57 and LIR-1 on Vδ2- and Vδ2+ γδ T-cells were examined in peripheral blood cells using flow cytometry...
February 15, 2017: Journal of Medical Virology
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