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https://www.readbyqxmd.com/read/28339736/extractions-retention-and-stability-the-search-for-orthodontic-truth
#1
Sheldon Peck
Background and objectives: From the beginnings of modern orthodontics, questions have been raised about the extraction of healthy permanent teeth in order to correct malocclusions. A hundred years ago, orthodontic tooth extraction was debated with almost religious intensity by experts on either side of the issue. Sheldon Friel and his mentor Edward H. Angle both had much to say about this controversy. Today, after significant progress in orthodontic practice, similar arguments are being voiced between nonextraction expansionists and those who see the need for tooth extractions in some orthodontic patients...
February 23, 2017: European Journal of Orthodontics
https://www.readbyqxmd.com/read/28339691/z-guggulsterone-produces-antidepressant-like-effects-in-mice-through-activation-of-the-bdnf-signaling-pathway
#2
Chao Huang, Wen-Feng Hu, Ji-Li Wang, Peng Wang, Yu Gong, Li-Juan Tong, Bo Jiang, Wei Zhang, Yi-Bin Qin, Zhuo Chen, Rong-Rong Yang
Background: Z-guggulsterone, an active compound extracted from the gum resin of the tree commiphora mukul, has been shown to improve animal memory deficits via activating the brain-derived neurotrophic factor (BDNF) signaling pathway. Here, we investigated the antidepressant-like effect of Z-guggulsterone in a chronic unpredictable stress (CUS) mouse model of depression. Methods: The effects of Z-guggulsterone were assessed in mice tail suspension test (TST), forced swimming test (FST)...
February 21, 2017: International Journal of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28339635/the-impact-of-zonisamide-on-the-development-and-course-of-alcohol-dependence-in-rabbits-a-pharmaco-eeg-study
#3
Agata Krupa-Burtnik, Ewa Zwierzynska, Anna Kordala, Boguslawa Pietrzak
Aims: Zonisamide is a new anti-epileptic drug whose mechanism of action is associated with neurotransmission systems also involved in the pathogenesis of addiction. Recently, the role of memory processes and the hippocampus (Hp) is underlined in dependence. In our previous study, we determined that zonisamide decreases changes in hippocampal bioelectric activity induced by a single dose of ethanol. Methods: This study uses a pharmaco-EEG method to examine the impact of zonisamide on the development and course of alcohol dependence in rabbits...
February 17, 2017: Alcohol and Alcoholism: International Journal of the Medical Council on Alcoholism
https://www.readbyqxmd.com/read/28338977/effects-of-augmenting-n-methyl-d-aspartate-receptor-signaling-on-working-memory-and-experience-dependent-plasticity-in-schizophrenia-an-exploratory-study-using-acute-d-cycloserine
#4
Jennifer K Forsyth, Peter Bachman, Daniel H Mathalon, Brian J Roach, Elissa Ye, Robert F Asarnow
Cognitive deficits in schizophrenia have been hypothesized to reflect N-methyl-D-aspartate receptor (NMDAR) dysfunction. However, the mechanisms through which the NMDAR contributes to individual cognitive functions differ. To explore how NMDAR signaling relates to specific cognitive deficits in schizophrenia, we tested the effects of enhancing NMDAR signaling on working memory and experience-dependent plasticity using d-cycloserine (DCS). Plasticity was assessed using an EEG paradigm that utilizes high-frequency visual stimulation (HFvS) to induce neural potentiation, and 2 learning tasks, the information integration (IIT) and weather prediction (WPT) tasks...
March 17, 2017: Schizophrenia Bulletin
https://www.readbyqxmd.com/read/28338897/specialized-information-processing-deficits-and-distinct-metabolomic-profiles-following-tm-domain-disruption-of-nrg1
#5
Colm M P O'Tuathaigh, Naina Mathur, Matthew J O'Callaghan, Lynsey MacIntyre, Richard Harvey, Donna Lai, John L Waddington, Benjamin S Pickard, David G Watson, Paula M Moran
Although there is considerable genetic and pathologic evidence for an association between neuregulin 1 (NRG1) dysregulation and schizophrenia, the underlying molecular and cellular mechanisms remain unclear. Mutant mice containing disruption of the transmembrane (TM) domain of the NRG1 gene constitute a heuristic model for dysregulation of NRG1-ErbB4 signaling in schizophrenia. The present study focused on hitherto uncharacterized information processing phenotypes in this mutant line. Using a mass spectrometry-based metabolomics approach, we also quantified levels of unique metabolites in brain...
March 11, 2017: Schizophrenia Bulletin
https://www.readbyqxmd.com/read/28337645/maintenance-of-memory-for-melodies-articulation-or-attentional-refreshing
#6
Michael A Nees, Ellen Corrini, Peri Leong, Joanna Harris
Past research on the effects of articulatory suppression on working memory for nonverbal sounds has been characterized by discrepant findings, which suggests that multiple mechanisms may be involved in the rehearsal of nonverbal sounds. In two experiments we examined the potential roles of two theoretical mechanisms of verbal working memory-articulatory rehearsal and attentional refreshing-in the maintenance of memory for short melodies. In both experiments, participants performed a same-different melody comparison task...
March 23, 2017: Psychonomic Bulletin & Review
https://www.readbyqxmd.com/read/28337548/the-effects-of-anxiety-and-situation-specific-context-on-perceptual-motor-skill-a-multi-level-investigation
#7
Oliver R Runswick, André Roca, A Mark Williams, Neil E Bezodis, Jamie S North
We examined the effects of anxiety and situation-specific contextual information on attentional, interpretational, and behavioural processes underpinning perceptual-motor performance as proposed by Nieuwenhuys and Oudejans (Psychological Research 76:747-759; Nieuwenhuys, Oudejans, Psychological Research 76:747-759, 2012) using an in situ task. Twelve skilled cricket batsmen played against a skilled spin bowler under conditions manipulated to induce low and high levels of anxiety and the presence of low and high levels of situation-specific context...
March 23, 2017: Psychological Research
https://www.readbyqxmd.com/read/28337159/hey-teacher-don-t-leave-them-kids-alone-action-is-better-for-memory-than-reading
#8
Mathieu Hainselin, Laurence Picard, Patrick Manolli, Sophie Vankerkore-Candas, Béatrice Bourdin
There is no consensus on how the enactment effect (EE), although it is robust, enhances memory. Researchers are currently investigating the cognitive processes underlying this effect, mostly during adulthood; the link between EE and crucial function identified in adulthood such as episodic memory and binding process remains elusive. Therefore, this study aims to verify the existence of EE in 6-10 years old and assess cognitive functions potentially linked to this effect in order to shed light on the mechanisms underlying the EE during childhood...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28337131/changes-in-neuronal-oscillations-accompany-the-loss-of-hippocampal-ltp-that-occurs-in-an-animal-model-of-psychosis
#9
Alexander N Kalweit, Bezhad Amanpour-Gharaei, Jens Colitti-Klausnitzer, Denise Manahan-Vaughan
The first-episode of psychosis is followed by a transient time-window of ca. 60 days during which therapeutic interventions have a higher likelihood of being effective than interventions that are started with a greater latency. This suggests that, in the immediate time-period after first-episode psychosis, functional changes occur in the brain that render it increasingly resistant to intervention. The precise mechanistic nature of these changes is unclear, but at the cognitive level, sensory and hippocampus-based dysfunctions become increasingly manifest...
2017: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/28336433/early-stage-reduction-of-the-dendritic-complexity-in-basolateral-amygdala-of-a-transgenic-mouse-model-of-alzheimer-s-disease
#10
Congdi Guo, Ben Long, Yarong Hu, Jing Yuan, Hui Gong, Xiangning Li
Alzheimer's disease is a representative age-related neurodegenerative disease that could result in loss of memory and cognitive deficiency. However, the precise onset time of Alzheimer's disease affecting neuronal circuits and the mechanisms underlying the changes are not clearly known. To address the neuroanatomical changes during the early pathologic developing process, we acquired the neuronal morphological characterization of AD in APP/PS1 double-transgenic mice using the Micro-Optical Sectioning Tomography system...
March 20, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28336411/exogenous-hydrogen-sulfide-eliminates-spatial-memory-retrieval-impairment-and-hippocampal-ca1-ltd-enhancement-caused-by-acute-stress-via-promoting-glutamate-uptake
#11
Jin He, Ruixian Guo, Pengxin Qiu, Xingwen Su, Guangmei Yan, Jianqiang Feng
Acute stress impairs the hippocampus-dependent spatial memory retrieval, and its synaptic mechanisms are associated with hippocampal CA1 long-term depression (LTD) enhancement in the adult rats. Endogenous hydrogen sulfide (H2S) is recognized as a novel gasotransmitter and has the neural protective roles. However, very little attention has been paid to understanding the effects of H2S on spatial memory retrieval impairment. We observed the protective effects of NaHS (a donor of H2S) against spatial memory retrieval impairment caused by acute stress and its synaptic mechanisms...
March 20, 2017: Neuroscience
https://www.readbyqxmd.com/read/28336337/mismatch-negativity-as-a-potential-neurobiological-marker-of-early-stage-alzheimer-disease-and-vascular-dementia
#12
Shixiang Jiang, Chang Yan, Zhengxue Qiao, Haiqian Yao, Shiquan Jiang, Xiaohui Qiu, Xiuxian Yang, Deyu Fang, Yanjie Yang, Limei Zhang, Lina Wang, Liming Zhang
Alzheimer's disease (AD) and vascular dementia (VD) are serious, irreversible forms of cognitive impairment, which means that an early diagnosis is essential to slow down their progression. One potential neurophysiological biomarker of these diseases is the mismatch negativity (MMN) event-related potentials (ERP) component, which reflects an automatic detection mechanism at the pre-attentive stages of information processing. We evaluated the auditory MMN response in individuals from two patient groups: those in the prodromal stages of AD (P-AD) and those in the prodromal stages of VD (P-VD)...
March 20, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28336100/in-vivo-evaluation-of-the-hippocampal-glutamate-gaba-and-the-bdnf-levels-associated-with-spatial-memory-performance-in-a-rodent-model-of-neuropathic-pain
#13
S Saffarpour, M Shaabani, N Naghdi, M Farahmandfar, A Janzadeh, F Nasirinezhad
BACKGROUND: Patients with chronic pain usually suffer from learning and memory impairment which may significantly decrease their quality of life. Despite laboratory and clinical studies, the mechanism underlying this memory impairment remains elusive. We evaluated the effect of chronic pain on the glutamate and GABA levels and BDNF expression in the CA1 region of hippocampus as a possible explanation for memory impairment related to neuropathic pain. METHODS: In this respect, 30 male rats were randomly allocated to 3 groups as control, sham and neuropathic...
March 20, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28335613/tightly-bound-soil-water-introduces-isotopic-memory-effects-on-mobile-and-extractable-soil-water-pools
#14
Sarah L Newberry, Ulrich E Prechsl, Matthew Pace, Ansgar Kahmen
Cryogenic vacuum extraction is the well-established method of extracting water from soil for isotopic analyses of waters moving through the soil-plant-atmosphere continuum. We investigate if soils can alter the isotopic composition of water through isotope memory effects, and determined which mechanisms are responsible for it. Soils with differing physicochemical properties were re-wetted with reference water and subsequently extracted by cryogenic water distillation. Results suggest some reference waters bind tightly to the soil and not all of this tightly bound water is removed during cryogenic vacuum extraction...
March 23, 2017: Isotopes in Environmental and Health Studies
https://www.readbyqxmd.com/read/28335000/better-than-sham-a-double-blind-placebo-controlled-neurofeedback-study-in-primary-insomnia
#15
Manuel Schabus, Hermann Griessenberger, Maria-Teresa Gnjezda, Dominik P J Heib, Malgorzata Wislowska, Kerstin Hoedlmoser
Neurofeedback training builds upon the simple concept of instrumental conditioning, i.e. behaviour that is rewarded is more likely to reoccur, an effect Thorndike referred to as the 'law of effect'. In the case of neurofeedback, information about specific electroencephalographic activity is fed back to the participant who is rewarded whenever the desired electroencephalography pattern is generated. If some kind of hyperarousal needs to be addressed, the neurofeedback community considers sensorimotor rhythm neurofeedback as the gold standard...
February 23, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/28334897/genetic-absence-of-alox5-protects-from-homocysteine-induced-memory-impairment-tau-phosphorylation-and-synaptic-pathology
#16
Jian-Guo Li, Carlos Barrero, Salim Merali, Domenico Praticò
Elevated level of homocysteine (Hcy) is considered a risk factor for neurodegenerative diseases, but the mechanisms remain to be established. Since high Hcy is associated with an up-regulation of the ALOX5 gene product, the 5Lipoxygenase (5LO), herein we investigated whether this activation is responsible for the Hcy effect on neurodegeneration or is a secondary event.To reach this goal, wild type mice and mice genetically deficient for 5LO were assessed after being exposed to a diet known to significantly increase brain levels of Hcy...
March 9, 2017: Human Molecular Genetics
https://www.readbyqxmd.com/read/28334849/icf-specific-dnmt3b-dysfunction-interferes-with-intragenic-regulation-of-mrna-transcription-and-alternative-splicing
#17
Sole Gatto, Miriam Gagliardi, Monica Franzese, Sylwia Leppert, Mariarosaria Papa, Marco Cammisa, Giacomo Grillo, Guillame Velasco, Claire Francastel, Shir Toubiana, Maurizio D'Esposito, Claudia Angelini, Maria R Matarazzo
Hypomorphic mutations in DNA-methyltransferase DNMT3B cause majority of the rare disorder Immunodeficiency, Centromere instability and Facial anomalies syndrome cases (ICF1). By unspecified mechanisms, mutant-DNMT3B interferes with lymphoid-specific pathways resulting in immune response defects. Interestingly, recent findings report that DNMT3B shapes intragenic CpG-methylation of highly-transcribed genes. However, how the DNMT3B-dependent epigenetic network modulates transcription and whether ICF1-specific mutations impair this process remains unknown...
March 9, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28334611/somatosensory-cortex-plays-an-essential-role-in-forelimb-motor-adaptation-in-mice
#18
Mackenzie Weygandt Mathis, Alexander Mathis, Naoshige Uchida
Our motor outputs are constantly re-calibrated to adapt to systematic perturbations. This motor adaptation is thought to depend on the ability to form a memory of a systematic perturbation, often called an internal model. However, the mechanisms underlying the formation, storage, and expression of such models remain unknown. Here, we developed a mouse model to study forelimb adaptation to force field perturbations. We found that temporally precise photoinhibition of somatosensory cortex (S1) applied concurrently with the force field abolished the ability to update subsequent motor commands needed to reduce motor errors...
March 22, 2017: Neuron
https://www.readbyqxmd.com/read/28334610/a-novel-mechanism-for-the-grid-to-place-cell-transformation-revealed-by-transgenic-depolarization-of-medial-entorhinal-cortex-layer-ii
#19
Benjamin R Kanter, Christine M Lykken, Daniel Avesar, Aldis Weible, Jasmine Dickinson, Benjamin Dunn, Nils Z Borgesius, Yasser Roudi, Clifford G Kentros
The spatial receptive fields of neurons in medial entorhinal cortex layer II (MECII) and in the hippocampus suggest general and environment-specific maps of space, respectively. However, the relationship between these receptive fields remains unclear. We reversibly manipulated the activity of MECII neurons via chemogenetic receptors and compared the changes in downstream hippocampal place cells to those of neurons in MEC. Depolarization of MECII impaired spatial memory and elicited drastic changes in CA1 place cells in a familiar environment, similar to those seen during remapping between distinct environments, while hyperpolarization did not...
March 22, 2017: Neuron
https://www.readbyqxmd.com/read/28334189/neural-mechanisms-for-the-benefits-of-stimulus-driven-attention
#20
Katelyn M Wills, Jingtai Liu, Jonathan Hakun, David C Zhu, Eliot Hazeltine, Susan M Ravizza
Stimulus-driven attention can improve working memory (WM) when drawn to behaviorally relevant information, but the neural mechanisms underlying this effect are unclear. The present study used functional magnetic resonance imaging (fMRI) to test competing hypotheses regarding the nature of the benefits of stimulus-driven attention to WM: that stimulus-driven attention benefits WM directly via salience detection, that stimulus-driven attention benefits WM incidentally via cognitive control mechanisms recruited to reduce interference from salient features, or that both mechanisms are co-involved in enhancing WM for salient information...
October 5, 2016: Cerebral Cortex
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