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https://www.readbyqxmd.com/read/29351584/the-roles-of-left-versus-right-anterior-temporal-lobes-in-semantic-memory-a-neuropsychological-comparison-of-postsurgical-temporal-lobe-epilepsy-patients
#1
Grace E Rice, Helen Caswell, Perry Moore, Paul Hoffman, Matthew A Lambon Ralph
The presence and degree of specialization between the anterior temporal lobes (ATLs) is a key issue in debates about the neural architecture of semantic memory. Here, we comprehensively assessed multiple aspects of semantic cognition in a large group of postsurgical temporal lobe epilepsy (TLE) patients with left versus right anterior temporal lobectomy (n = 40). Both subgroups showed deficits in expressive and receptive verbal semantic tasks, word and object recognition, naming and recognition of famous faces and perception of faces and emotions...
January 17, 2018: Cerebral Cortex
https://www.readbyqxmd.com/read/29347877/part-set-cueing-impairment-facilitation-in-semantic-memory
#2
Matthew R Kelley, Sushmeena A Parihar
The present study explored the influence of part-set cues in semantic memory using tests of "free" recall, reconstruction of order, and serial recall. Nine distinct categories of information were used (e.g., Zodiac signs, Harry Potter books, Star Wars films, planets). The results showed part-set cueing impairment for all three "free" recall sets, whereas part-set cueing facilitation was evident for five of the six ordered sets. Generally, the present results parallel those often observed across episodic tasks, which could indicate that similar mechanisms contribute to part-set cueing effects in both episodic and semantic memory...
January 19, 2018: Memory
https://www.readbyqxmd.com/read/29341344/the-medial-temporal-lobe-functional-connectivity-patterns-associated-with-forming-different-mental-representations
#3
Signy Sheldon, Brian Levine
The medial temporal lobes (MTL), and more specifically the hippocampus, are critical for forming mental representations of past experiences - autobiographical memories - and for forming other 'non-experienced' types of mental representations, such as imagined scenarios. How the MTL coordinate with other brain areas to create these different types of representations is not well understood. To address this issue, we performed a task-based functional connectivity analysis on a previously published dataset in which fMRI data were collected as participants created different types of mental representations under three conditions...
January 17, 2018: Hippocampus
https://www.readbyqxmd.com/read/29339514/flexibility-of-thought-in-high-creative-individuals-represented-by-percolation-analysis
#4
Yoed N Kenett, Orr Levy, Dror Y Kenett, H Eugene Stanley, Miriam Faust, Shlomo Havlin
Flexibility of thought is theorized to play a critical role in the ability of high creative individuals to generate novel and innovative ideas. However, this has been examined only through indirect behavioral measures. Here we use network percolation analysis (removal of links in a network whose strength is below an increasing threshold) to computationally examine the robustness of the semantic memory networks of low and high creative individuals. Robustness of a network indicates its flexibility and thus can be used to quantify flexibility of thought as related to creativity...
January 16, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29339310/distant-from-input-evidence-of-regions-within-the-default-mode-network-supporting-perceptually-decoupled-and-conceptually-guided-cognition
#5
Charlotte Murphy, Elizabeth Jefferies, Shirley-Ann Rueschemeyer, Mladen Sormaz, Hao-Ting Wang, Daniel S Margulies, Jonathan Smallwood
The default mode network supports a variety of mental operations such as semantic processing, episodic memory retrieval, mental time travel and mind-wandering, yet the commonalities between these functions remains unclear. One possibility is that this system supports cognition that is independent of the immediate environment; alternatively or additionally, it might support higher-order conceptual representations that draw together multiple features. We tested these accounts using a novel paradigm that separately manipulated the availability of perceptual information to guide decision-making and the representational complexity of this information...
January 12, 2018: NeuroImage
https://www.readbyqxmd.com/read/29335040/does-a-cognitive-stress-test-predict-progression-from-mild-cognitive-impairment-to-dementia-equally-well-in-clinical-versus-population-based-settings
#6
Joanne C Beer, Beth E Snitz, Chung-Chou H Chang, David A Loewenstein, Mary Ganguli
BACKGROUND: Evidence suggests that semantic interference may be a sensitive indicator of early dementia. We examined the utility of the Semantic Interference Test (SIT), a cognitive stress memory paradigm which taps proactive and retroactive semantic interference, for predicting progression from mild cognitive impairment (MCI) to dementia in both a clinical and a population-based sample. METHODS: Participants with MCI in the clinical (n = 184) and population-based (n = 435) samples were followed for up to four years...
January 16, 2018: International Psychogeriatrics
https://www.readbyqxmd.com/read/29324460/sex-differences-in-alzheimer-s-disease
#7
Keith R Laws, Karen Irvine, Tim M Gale
PURPOSE OF REVIEW: Women are more impacted by Alzheimer's disease than men - they are at significantly greater risk of developing Alzheimer's disease, and recent research shows that they also appear to suffer a greater cognitive deterioration than men at the same disease stage. The purpose of this article is to review recent studies on examining sex differences in cognitive function in Alzheimer's disease. RECENT FINDINGS: We searched electronically for articles, reviews and meta-analyses published between 1/2016 and 12/2017 and identified 298 articles on sex differences in cognition in Alzheimer's disease...
January 10, 2018: Current Opinion in Psychiatry
https://www.readbyqxmd.com/read/29324072/alpha-oscillations-during-incidental-encoding-predict-subsequent-memory-for-new-foil-information
#8
David A Vogelsang, Matthias Gruber, Zara M Bergström, Charan Ranganath, Jon S Simons
People can employ adaptive strategies to increase the likelihood that previously encoded information will be successfully retrieved. One such strategy is to constrain retrieval toward relevant information by reimplementing the neurocognitive processes that were engaged during encoding. Using EEG, we examined the temporal dynamics with which constraining retrieval toward semantic versus nonsemantic information affects the processing of new "foil" information encountered during a memory test. Time-frequency analysis of EEG data acquired during an initial study phase revealed that semantic compared with nonsemantic processing was associated with alpha decreases in a left frontal electrode cluster from around 600 msec after stimulus onset...
January 11, 2018: Journal of Cognitive Neuroscience
https://www.readbyqxmd.com/read/29318375/action-compatibility-in-spatial-knowledge-developed-through-virtual-navigation
#9
Qi Wang, Holly A Taylor, Tad T Brunyé
Action-compatibility effects (ACEs) arise due to incongruity between perceptuo-motor traces stored in memory and the perceptuo-motor demands of a retrieval task. Recent research has suggested that ACEs arising during spatial memory retrieval are additionally modulated by individual differences in how experienced participants are with a college campus environment. However, the extent and nature of experience with a real-world environment is difficult to assess and control, and characteristics of the retrieval task itself might modulate ACEs during spatial memory retrieval...
January 9, 2018: Psychological Research
https://www.readbyqxmd.com/read/29307083/in-thai-nationals-the-apoe4-allele-affects-multiple-domains-of-neuropsychological-biobehavioral-and-social-functioning-thereby-contributing-to-alzheimer-s-disorder-while-the-apoe3-allele-protects-against-neuropsychiatric-symptoms-and-psychosocial-deficits
#10
Sookjaroen Tangwongchai, Thitiporn Supasitthumrong, Solaphat Hemrunroj, Chavit Tunvirachaisakul, Phenphichcha Chuchuen, Natnicha Houngngam, Thiti Snabboon, Ittipol Tawankanjanachot, Yuthachai Likitchareon, Kamman Phanthumchindad, Michael Maes
The apolipoprotein E epsilon 4 (ApoE4) allele is the strongest genetic risk factor for Alzheimer's disorder (AD) and is associated with semantic and episodic memory deficits. The aim of this study was to examine the associations between ApoE alleles (E2, E3, E4) and genotypes and neuropsychological tests, behavioral functions, and dementia symptoms as assessed using Consortium to Establish a Registry for Alzheimer's Disease (CERAD). This study included 60 patients with Alzheimer's disorder (AD), 60 with mild cognitive disorder (MCI), and 62 normal volunteers...
January 6, 2018: Molecular Neurobiology
https://www.readbyqxmd.com/read/29304418/cortical-sources-of-resting-state-electroencephalographic-rhythms-probe-brain-function-in-na%C3%A3-ve-hiv-individuals
#11
Claudio Babiloni, Giuseppe Noce, Alfredo Pennica, Paolo Onorati, Paolo Capotosto, Claudio Del Percio, Paolo Roma, Valentina Correr, Elisa Piccinni, Ginevra Toma, Andrea Soricelli, Francesco Di Campli, Laura Gianserra, Lorenzo Ciullini, Antonio Aceti, Elisabetta Teti, Loredana Sarmati, Gloria Crocetti, Raffaele Ferri, Valentina Catania, Maria Teresa Pascarelli, Massimo Andreoni, Stefano Ferracuti
OBJECTIVE: Here we evaluated the hypothesis that resting state electroencephalographic (EEG) cortical sources correlated with cognitive functions and discriminated asymptomatic treatment-naïve HIV subjects (no AIDS). METHODS: EEG, clinical, and neuropsychological data were collected in 103 treatment-naïve HIV subjects (88 males; mean age 39.8 years ± 1.1 standard error of the mean, SE). An age-matched group of 70 cognitively normal and HIV-negative (Healthy; 56 males; 39...
December 20, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29289617/the-anterior-ventrolateral-temporal-lobe-contributes-to-boosting-visual-working-memory-capacity-for-items-carrying-semantic-information
#12
Rocco Chiou, Matthew A Lambon Ralph
Working memory (WM) is a buffer that temporarily maintains information, be it visual or auditory, in an active state, caching its contents for online rehearsal or manipulation. How the brain enables long-term semantic knowledge to affect the WM buffer is a theoretically significant issue awaiting further investigation. In the present study, we capitalise on the knowledge about famous individuals as a 'test-case' to study how it impinges upon WM capacity for human faces and its neural substrate. Using continuous theta-burst transcranial stimulation combined with a psychophysical task probing WM storage for varying contents, we provide compelling evidence that (1) faces (regardless of familiarity) continued to accrue in the WM buffer with longer encoding time, whereas for meaningless stimuli (colour shades) there was little increment; (2) the rate of WM accrual was significantly more efficient for famous faces, compared to unknown faces; (3) the right anterior-ventrolateral temporal lobe (ATL) causally mediated this superior WM storage for famous faces...
December 28, 2017: NeuroImage
https://www.readbyqxmd.com/read/29283204/binding-language-structuring-sentences-through-precisely-timed-oscillatory-mechanisms
#13
Katrien Segaert, Ali Mazaheri, Peter Hagoort
Syntactic binding refers to combining words into larger structures. Using EEG, we investigated the neural processes involved in syntactic binding. Participants were auditorily presented two-word sentences (i.e. pronoun and pseudoverb such as 'I grush', 'she grushes', for which syntactic binding can take place) and wordlists (i.e. two pseudoverbs such as 'pob grush', 'pob grushes', for which no binding occurs). Comparing these two conditions, we targeted syntactic binding while minimizing contributions of semantic binding and of other cognitive processes such as working memory...
December 28, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/29283048/compensatory-shift-of-subcallosal-area-and-paraterminal-gyrus-white-matter-parameters-on-dti-in-patients-with-alzheimer-disease
#14
Barbora Kuchtova, Zdenek Wurst, Jana Mrzílkova, Ibrahim Ibrahim, Jaroslav Tintera, Ales Bartos, Vladimir Musil, Karel Kieslich, Petr Zach
OBJECTIVE: Alzheimer disease is traditionally conceptualized as a disease of brain gray matter, however, studies with diffusion tensor imaging have demonstrated that Alzheimer disease also involves alterations in white matter integrity. We measured number of tracts, tracts length, tract volume, quantitative anisotropy and general fractional anisotropy of neuronal tracts in subcallosal area, paraterminal gyrus and fornix in patients with Alzheimer disease and healthy age-matched controls...
December 27, 2017: Current Alzheimer Research
https://www.readbyqxmd.com/read/29283001/decision-making-competence-in-younger-and-older-adults-which-cognitive-abilities-contribute-to-the-application-of-decision-rules
#15
Alessia Rosi, Wändi Bruine de Bruin, Fabio Del Missier, Elena Cavallini, Riccardo Russo
Older adults perform worse than younger adults when applying decision rules to choose between options that vary along multiple attributes. Although previous studies have shown that general fluid cognitive abilities contribute to the accurate application of decision rules, relatively little is known about which specific cognitive abilities play the most important role. We examined the independent roles of working memory, verbal fluency, semantic knowledge, and components of executive functioning. We found that age-related decline in applying decision rules was statistically mediated by age-related decline in working memory and verbal fluency...
December 28, 2017: Neuropsychology, Development, and Cognition. Section B, Aging, Neuropsychology and Cognition
https://www.readbyqxmd.com/read/29280030/effect-of-retirement-on-cognitive-function-the-whitehall-ii-cohort-study
#16
Baowen Xue, Dorina Cadar, Maria Fleischmann, Stephen Stansfeld, Ewan Carr, Mika Kivimäki, Anne McMunn, Jenny Head
According to the 'use it or lose it' hypothesis, a lack of mentally challenging activities might exacerbate the loss of cognitive function. On this basis, retirement has been suggested to increase the risk of cognitive decline, but evidence from studies with long follow-up is lacking. We tested this hypothesis in a cohort of 3433 civil servants who participated in the Whitehall II Study, including repeated measurements of cognitive functioning up to 14 years before and 14 years after retirement. Piecewise models, centred at the year of retirement, were used to compare trajectories of verbal memory, abstract reasoning, phonemic verbal fluency, and semantic verbal fluency before and after retirement...
December 26, 2017: European Journal of Epidemiology
https://www.readbyqxmd.com/read/29279230/the-weapons-effect
#17
REVIEW
Arlin James Benjamin, Brad J Bushman
In some societies, weapons are plentiful and highly visible. This review examines recent trends in research on the weapons effect, which is the finding that the mere presence of weapons can prime people to behave aggressively. The General Aggression Model provides a theoretical framework to explain why the weapons effect occurs. This model postulates that exposure to weapons increases aggressive thoughts and hostile appraisals, thus explaining why weapons facilitate aggressive behavior. Data from meta-analytic reviews are consistent with the General Aggression Model...
February 2018: Current Opinion in Psychology
https://www.readbyqxmd.com/read/29276494/no-sensory-compensation-for-olfactory-memory-differences-between-blind-and-sighted-people
#18
Agnieszka Sorokowska, Maciej Karwowski
Blindness can be a driving force behind a variety of changes in sensory systems. When vision is missing, other modalities and higher cognitive functions can become hyper-developed through a mechanism called sensory compensation. Overall, previous studies suggest that olfactory memory in blind people can be better than that of the sighted individuals. Better performance of blind individuals in other-sensory modalities was hypothesized to be a result of, among others, intense perceptual training. At the same time, if the superiority of blind people in olfactory abilities indeed results from training, their scores should not decrease with age to such an extent as among the sighted people...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/29275185/characteristics-of-gray-matter-morphological-change-in-parkinson-s-disease-patients-with-semantic-abstract-reasoning-deficits
#19
Li Wang, Kun Nie, Xin Zhao, Shujun Feng, Sifen Xie, Xuetao He, Guixian Ma, Limin Wang, Zhiheng Huang, Biao Huang, Yuhu Zhang, Lijuan Wang
BACKGROUND: Semantic abstract reasoning(SAR) is an important executive domain that is involved in semantic information processing and enables one to make sense of the attributes of objects, facts and concepts in the world. We sought to investigate whether Parkinson's disease subjects(PDs) have difficulty in SAR and to examine the associated pattern of gray matter morphological changes. METHODS: Eighty-six PDs and 30 healthy controls were enrolled. PDs were grouped into PD subjects with Similarities preservation(PDSP, n = 62) and PD subjects with Similarities impairment(PDSI, n = 24)according to their performance on the Similarities subtest of the Wechsler Adult Intelligence Scale...
December 21, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/29273691/neuropsychological-outcome-after-subtemporal-versus-transsylvian-approach-for-selective-amygdalohippocampectomy-in-patients-with-mesial-temporal-lobe-epilepsy-a-randomised-prospective-clinical-trial
#20
Viola Lara Vogt, Daniel Delev, Alexander Grote, Johannes Schramm, Marec von Lehe, Christian Erich Elger, Juri-Alexander Witt, Christoph Helmstaedter
OBJECTIVE: To compare the effects of different surgical approaches for selective amygdalohippocampectomy in patients with pharmacoresistant mesial temporal lobe epilepsy with regard to the neuropsychological outcome and to replicate an earlier study employing a matched-pair design. METHOD: 47 patients were randomised to subtemporal versus transsylvian approaches. Memory, language, attentional and executive functions were assessed before and 1 year after surgery...
December 22, 2017: Journal of Neurology, Neurosurgery, and Psychiatry
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