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https://www.readbyqxmd.com/read/28736170/overlap-among-spatial-memories-triggers-repulsion-of-hippocampal-representations
#1
Avi J H Chanales, Ashima Oza, Serra E Favila, Brice A Kuhl
Across the domains of spatial navigation and episodic memory, the hippocampus is thought to play a critical role in disambiguating (pattern separating) representations of overlapping events. However, it is not fully understood how and why hippocampal patterns become separated. Here, we test the idea that event overlap triggers a "repulsion" among hippocampal representations that develops over the course of learning. Using a naturalistic route-learning paradigm and spatiotemporal pattern analysis of human fMRI data, we found that hippocampal representations of overlapping routes gradually diverged with learning to the point that they became less similar than representations of non-overlapping events...
July 15, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28727668/comprehensive-cardiac-rehabilitation-for-secondary-prevention-after-transient-ischemic-attack-or-mild-stroke-psychological-profile-and-outcomes
#2
Peter L Prior, Vladimir Hachinski, Richard Chan, Karen Unsworth, Sharon Mytka, Michael Harnadek, Christina OʼCallaghan, Neville Suskin
PURPOSE: Having previously reported that comprehensive cardiac rehabilitation (CCR) is effective for secondary prevention post-transient ischemic attack (TIA)/mild nondisabling stroke (MNDS), we present psychometric findings for the same sample that elucidate subacute TIA/MNDS psychological outcomes and test whether CCR would be independently associated with psychological improvements. METHODS: In this prospective cohort trial patients with ≥1 risk factor, recruited from a stroke prevention clinic within 12 months (mean = 11...
July 19, 2017: Journal of Cardiopulmonary Rehabilitation and Prevention
https://www.readbyqxmd.com/read/28725022/action-video-games-improve-reading-abilities-and-visual-to-auditory-attentional-shifting-in-english-speaking-children-with-dyslexia
#3
Sandro Franceschini, Piergiorgio Trevisan, Luca Ronconi, Sara Bertoni, Susan Colmar, Kit Double, Andrea Facoetti, Simone Gori
Dyslexia is characterized by difficulties in learning to read and there is some evidence that action video games (AVG), without any direct phonological or orthographic stimulation, improve reading efficiency in Italian children with dyslexia. However, the cognitive mechanism underlying this improvement and the extent to which the benefits of AVG training would generalize to deep English orthography, remain two critical questions. During reading acquisition, children have to integrate written letters with speech sounds, rapidly shifting their attention from visual to auditory modality...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28721053/reduced-prefrontal-activation-during-verbal-fluency-task-in-chronic-insomnia-disorder-a-multichannel-near-infrared-spectroscopy-study
#4
Jing-Jing Sun, Xiao-Min Liu, Chen-Yu Shen, Xiao-Qian Zhang, Gao-Xiang Sun, Kun Feng, Bo Xu, Xia-Jin Ren, Xiang-Yun Ma, Po-Zi Liu
PURPOSE: Daytime complaints such as memory and attention deficits and failure to accomplish daily tasks are common in insomnia patients. However, objective psychological tests to detect cognitive impairment are equivocal. Neural function associated with cognitive performance may explain the discrepancy. The aim of this study was to investigate the hemodynamic response patterns of patients with chronic insomnia disorder (CID) using the noninvasive and low-cost functional neuroimaging technique of multichannel near-infrared spectroscopy (NIRS) in order to identify changes of neural function associated with cognitive performance...
2017: Neuropsychiatric Disease and Treatment
https://www.readbyqxmd.com/read/28718338/the-role-of-attention-at-retrieval-on-the-false-recognition-of-negative-emotional-drm-lists
#5
Datin Shah, Lauren M Knott
This study examined the role of attention at retrieval on the false recognition of emotional items using the Deese-Roediger-McDermott (DRM) paradigm. Previous research has shown that divided attention at test increases false remember judgements for neutral critical lures. However, no research has yet directly assessed emotional false memories when attention is manipulated at retrieval. To examine this, participants studied negative (low in valence and high in arousal) and neutral DRM lists and completed recognition tests under conditions of full and divided attention...
July 18, 2017: Memory
https://www.readbyqxmd.com/read/28711591/touching-the-void-first-and-third-person-perspectives-in-two-cases-of-autobiographical-amnesia-linked-to-temporal-lobe-epilepsy
#6
Adam Zeman, Marcus Byruck, Peter Tallis, Keith Vossel, Daniel Tranel
Temporal lobe epilepsy (TLE) can be associated with a marked impairment of autobiographical memory. This is occasionally its presenting feature. We describe two individuals with severe epilepsy-associated autobiographical memory loss. Both MB and PT were reassured initially that their memory was intact on the basis of standard neuropsychological tests. Both have written detailed accounts of their symptoms. The key neuropsychological features of their cases are the relative normality of performance on standard memory tests, with preservation of semantic memory for impersonal information, in contrast to a profound amnesia for salient autobiographical episodes and an impoverishment of imaginative scene construction...
July 12, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28708006/a-near-visual-acuity-test-for-dentists
#7
P Perrin, M Eichenberger, K W Neuhaus, A Lussi
Unimpaired near vision is crucial in dentistry, but appropriate visual tests at dental working distance are not publicly available. The aim of this study was to validate a novel visual triage test for dentists that is easy to use and freely available. The near visual acuity at 300 mm of 106 dental professionals (aged 21-65 years) was assessed with 1) a validated near visual test for scientific purposes miniaturized on a microfilm; 2) an experimental test using a US $5 bill, in which the first five words of each line in the Lincoln Memorial frieze had to be read under a dental operating light...
July 14, 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28707277/open-label-allopregnanolone-treatment-of-men-with-fragile-x-associated-tremor-ataxia-syndrome
#8
J Y Wang, A M Trivedi, N R Carrillo, J Yang, A Schneider, C Giulivi, P Adams, F Tassone, K Kim, S M Rivera, N Lubarr, C-Y Wu, R W Irwin, R D Brinton, J M Olichney, M A Rogawski, R J Hagerman
Fragile X-associated tremor/ataxia syndrome (FXTAS) is a late-onset neurodegenerative disorder affecting approximately 45% of male and 16% of female carriers of the FMR1 premutation over the age of 50 years. Currently, no effective treatment is available. We performed an open-label intervention study to assess whether allopregnanolone, a neurosteroid promoting regeneration and repair, can improve clinical symptoms, brain activity, and magnetic resonance imaging (MRI) measurements in patients with FXTAS. Six patients underwent weekly intravenous infusions of allopregnanolone (2-6 mg over 30 min) for 12 weeks...
July 13, 2017: Neurotherapeutics: the Journal of the American Society for Experimental NeuroTherapeutics
https://www.readbyqxmd.com/read/28704379/fractionating-nonword-repetition-the-contributions-of-short-term-memory-and-oromotor-praxis-are-different
#9
Saloni Krishnan, Katherine J Alcock, Daniel Carey, Lina Bergström, Annette Karmiloff-Smith, Frederic Dick
The ability to reproduce novel words is a sensitive marker of language impairment across a variety of developmental disorders. Nonword repetition tasks are thought to reflect phonological short-term memory skills. Yet, when children hear and then utter a word for the first time, they must transform a novel speech signal into a series of coordinated, precisely timed oral movements. Little is known about how children's oromotor speed, planning and co-ordination abilities might influence their ability to repeat novel nonwords, beyond the influence of higher-level cognitive and linguistic skills...
2017: PloS One
https://www.readbyqxmd.com/read/28702351/activation-of-dominant-hemisphere-association-cortex-during-naming-as-a-function-of-cognitive-performance-in-mild-traumatic-brain-injury-insights-into-mechanisms-of-lexical-access
#10
Mihai Popescu, John D Hughes, Elena-Anda Popescu, Judy Mikola, Warren Merrifield, Maria DeGraba, Gerard Riedy, Thomas J DeGraba
Patients with a history of mild traumatic brain injury (mTBI) and objective cognitive deficits frequently experience word finding difficulties in normal conversation. We sought to improve our understanding of this phenomenon by determining if the scores on standardized cognitive testing are correlated with measures of brain activity evoked in a word retrieval task (confrontational picture naming). The study participants (n = 57) were military service members with a history of mTBI. The General Memory Index (GMI) determined after administration of the Rivermead Behavioral Memory Test, Third Edition, was used to assign subjects to three groups: low cognitive performance (Group 1: GMI ≤ 87, n = 18), intermediate cognitive performance (Group 2: 88 ≤ GMI ≤ 99, n = 18), and high cognitive performance (Group 3: GMI ≥ 100, n = 21)...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28701077/older-adults-encode-more-not-less-evidence-for-age-related-attentional-broadening
#11
Jennifer C Weeks, Lynn Hasher
Previous work has shown that older adults attend to and implicitly remember more distracting information than young adults; however, it is unknown whether they show a corresponding decrease in implicit memory for targets in the presence of distracters. Using implicit memory tests, we asked whether older adults show a tradeoff in memory between targets and distracters. Here, young and older adults performed a selective attention task in which they were instructed to attend to target pictures and ignore superimposed distracter words...
July 13, 2017: Neuropsychology, Development, and Cognition. Section B, Aging, Neuropsychology and Cognition
https://www.readbyqxmd.com/read/28696772/enhanced-detection-of-feigned-cognitive-impairment-using-per-item-response-time-measurements-in-the-word-memory-test
#12
T Lupu, T Elbaum, M Wagner, Y Braw
Response time (RT) is a less obvious outcome measure than conventional accuracy measures used in performance validity tests (PVTs). It is also under less conscious control and is affected by cognitive processes associated with deception. Studies that assessed the utility of RT for the detection of feigned cognitive impairment are however numbered. Moreover, RT variability was not assessed in a clinically used PVT. In the current study, we assessed the utility of RT measures for the detection of feigned cognitive impairment in the Word Memory Test (WMT)...
July 11, 2017: Applied Neuropsychology. Adult
https://www.readbyqxmd.com/read/28694119/recurrent-neural-networks-for-classifying-relations-in-clinical-notes
#13
Yuan Luo
We proposed the first models based on recurrent neural networks (more specifically Long Short-Term Memory - LSTM) for classifying relations from clinical notes. We tested our models on the i2b2/VA relation classification challenge dataset. We showed that our segment LSTM model, with only word embedding feature and no manual feature engineering, achieved a micro-averaged f-measure of 0.661 for classifying medical problem-treatment relations, 0.800 for medical problem-test relations, and 0.683 for medical problem-medical problem relations...
July 7, 2017: Journal of Biomedical Informatics
https://www.readbyqxmd.com/read/28694011/the-relationship-between-salivary-c-reactive-protein-and-cognitive-function-in-children-aged-11-14years-does-psychopathology-have-a-moderating-effect
#14
Alexis E Cullen, Ben M Tappin, Patricia A Zunszain, Hannah Dickson, Ruth E Roberts, Naghmeh Nikkheslat, Mizan Khondoker, Carmine M Pariante, Helen L Fisher, Kristin R Laurens
Elevated C-reactive protein (CRP), a non-specific biomarker of systemic bodily inflammation, has been associated with more pronounced cognitive impairments in adults with psychiatric disorders, particularly in the domains of memory and executive function. Whether this association is present in early life (i.e., the time at which the cognitive impairments that characterise these disorders become evident), and is specific to those with emerging psychiatric disorders, has yet to be investigated. To this end, we examined the association between salivary CRP and cognitive function in children aged 11-14years and explored the moderating effect of psychopathology...
July 8, 2017: Brain, Behavior, and Immunity
https://www.readbyqxmd.com/read/28693707/the-role-of-backward-associative-strength-in-false-recognition-of-drm-lists-with-multiple-critical-words
#15
María S Beato, Jason Arndt
BACKGROUND: Memory is a reconstruction of the past and is prone to errors. One of the most widely-used paradigms to examine false memory is the Deese/Roediger-McDermott (DRM) paradigm. In this paradigm, participants studied words associatively related to a non-presented critical word. In a subsequent memory test critical words are often falsely recalled and/or recognized. METHOD: In the present study, we examined the influence of backward associative strength (BAS) on false recognition using DRM lists with multiple critical words...
August 2017: Psicothema
https://www.readbyqxmd.com/read/28693360/the-hopkins-verbal-learning-test-an-in-depth-analysis-of-recall-patterns
#16
Rachel Grenfell-Essam, Eef Hogervorst, Tri Budi W Rahardjo
One of the earliest signs of dementia is memory issues and verbal word lists, such as the Hopkins Verbal Learning Test (HVLT), are successfully used for screening. To gain insight in how memory is affected in dementia, and to further improve the efficacy of the HVLT, in-depth analysis of the recall patterns of dementia cases and controls was conducted. Dementia cases and controls were matched for factors that can affect performance, such as age, gender and education level. Word frequency, syllable length, and orthographic neighbourhood size did not differ in the Indonesian version of the HVLT, nor did these characteristics affect recall...
July 11, 2017: Memory
https://www.readbyqxmd.com/read/28691577/test-potentiated-learning-three-independent-replications-a-disconfirmed-hypothesis-and-an-unexpected-boundary-condition
#17
Kathryn T Wissman, Katherine A Rawson
Arnold and McDermott [(2013). Test-potentiated learning: Distinguishing between direct and indirect effects of testing. Journal of Experimental Psychology: Learning, Memory, and Cognition, 39, 940-945] isolated the indirect effects of testing and concluded that encoding is enhanced to a greater extent following more versus fewer practice tests, referred to as test-potentiated learning. The current research provided further evidence for test-potentiated learning and evaluated the covert retrieval hypothesis as an alternative explanation for the observed effect...
July 10, 2017: Memory
https://www.readbyqxmd.com/read/28690433/recognition-without-words-using-taste-to-explore-survival-processing
#18
Henry L Hallock, Heather D Garman, Shaun P Cook, Shawn P Gallagher
Many educational demonstrations of memory and recall employ word lists and number strings; items that lend themselves to semantic organization and "chunking." By applying taste recall to the adaptive memory paradigm, which evaluates memory from a survival-based evolutionary perspective, we have developed a simple, inexpensive exercise that defies mnemonic strategies. Most adaptive memory studies have evaluated recall of words encountered while imagining survival and non-survival scenarios. Here, we've left the lexical domain and hypothesized that taste memory, as measured by recognition, would be best when acquisition occurs under imagined threat of personal harm, namely poisoning...
2017: Journal of Undergraduate Neuroscience Education: JUNE: a Publication of FUN, Faculty for Undergraduate Neuroscience
https://www.readbyqxmd.com/read/28686822/mindfulness-based-stress-reduction-for-older-adults-with-stress-disorders-and-neurocognitive-difficulties-a-randomized-controlled-trial
#19
Julie Loebach Wetherell, Tamara Hershey, Steven Hickman, Susan R Tate, David Dixon, Emily S Bower, Eric J Lenze
OBJECTIVE: To determine whether neurocognitive performance and clinical outcomes can be enhanced by a mindfulness intervention in older adults with stress disorders and cognitive complaints. To explore decreased hypothalamic-pituitary-adrenal (HPA) axis activity as a possible mechanism. METHODS: 103 adults aged 65 years or older with an anxiety or depressive disorder (diagnosed according to DSM-IV criteria) and subjective neurocognitive difficulties were recruited in St...
July 5, 2017: Journal of Clinical Psychiatry
https://www.readbyqxmd.com/read/28686563/-legal-capacity-and-instruments-assessing-cognitive-functions-in-patients-with-dementia
#20
P Voskou, S Papageorgiou, A Economou, A Douzenis
The term "legal capacity" refers to the ability of a person to make a valid declaration of his will or to accept such a declaration. This ability constitutes the main condition for the validity of the legal transaction. The legal transaction includes issues that are adjusted by the Civil Code with which the relations of the citizens in a society are regulated. General practitioners and legal advisors, in any case of a person with cognitive impairment of various severity, should take into account that the assessment tests of the cognitive functions are not by themselves diagnostic of the dementia and they cannot be used as the only way of evaluation of the capacity of patients with cognitive impairment or possible dementia to respond to the needs of everyday life and in more complex decisions, such as the legal capacity...
April 2017: Psychiatrikē, Psychiatriki
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