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Tom A Hummer, K Luan Phan, David W Kern, Martha K McClintock
Evidence suggests the putative human pheromone Δ4,16-androstadien-3-one (androstadienone), a natural component of human sweat, increases attention to emotional information when passively inhaled, even in minute amounts. However, the neural mechanisms underlying androstadienone's impact on the perception of emotional stimuli have not been clarified. To characterize how the compound modifies neural circuitry while attending to emotional information, 22 subjects (11 women) underwent two fMRI scanning sessions, one with an androstadienone solution and one with a carrier control solution alone on their upper lip...
September 29, 2016: Psychoneuroendocrinology
Elisa C K Steinfurth, Manuela G Alius, Julia Wendt, Alfons O Hamm
The current experiments tested neural and physiological correlates of worry and rumination in comparison to thinking about neutral events. According to the avoidance model-stating that worry is a strategy to reduce intense emotions-physiological and neurobiological activity during worried thinking should not differ from activation during neutral thinking. According to the contrast avoidance model-stating that worry is a strategy to reduce abrupt shifts of emotions-activity should be increased. To test these competing models, we induced worry and neutral thinking in healthy participants using personal topics...
October 21, 2016: Psychophysiology
Ilhem Guesmi-Mzoughi, Antonio Archidona-Yuste, Carolina Cantalapiedra-Navarrete, Hajer Regaieg, Najet Horrigue-Raouani, Juan E Palomares-Rius, Pablo Castillo
Spiral nematode species of the genus Rotylenchus have been reported on olive (Olea europaea L.) in several Mediterranean countries (Castillo et al., 2010; Ali et al., 2014). Nematological surveys for plant-parasitic nematodes on olive trees were carried out in Tunisia between 2013 and 2014, and two nematode species of Rotylenchus were collected from the rhizosphere of olive cv. Chemlali in several localities of Tunisia (Tables 1,2 [Table: see text] [Table: see text] ). Twenty-two soil samples of 3 to 4 kg were collected with a shovel from the upper 50 cm of soil from arbitrarily chosen olive trees...
September 2016: Journal of Nematology
Deven A Karvelas, Sean D Rundell, Janna L Friedly, Alfred C Gellhorn, Laura S Gold, Bryan A Comstock, Patrick J Heagerty, Brian W Bresnahan, David R Nerenz, Jeffrey G Jarvik
BACKGROUND: The association between early physical therapy (PT) and subsequent healthcare utilization following a new visit for low back pain is not clear, particularly in the setting of acute low back pain. PURPOSE: To estimate the association between initiating early physical therapy following a new visit for an episode of low back pain and subsequent back-pain-specific health care utilization in older adults. STUDY DESIGN/SETTING: Prospective cohort study...
October 17, 2016: Spine Journal: Official Journal of the North American Spine Society
Sami Al Kasab, Michael J Lynn, Tanya N Turan, Colin P Derdeyn, David Fiorella, Bethany F Lane, L Scott Janis, Marc I Chimowitz
BACKGROUND: An American Heart Association/American Stroke Association (AHA/ASA) writing committee has recently recommended that tissue evidence of cerebral infarction associated with temporary symptoms (CITS) lasting <24 hours should be considered a stroke. We analyzed the impact of considering CITS as equivalent to stroke on the results of the Stenting and Aggressive Medical Management for Preventing Recurrent Stroke in Intracranial Stenosis (SAMMPRIS) trial. METHODS: We compared outcomes in the medical (n = 227) and stenting (n = 224) groups in SAMMPRIS using the following primary end point (new components in bold): any stroke, CITS, or death within 30 days after enrollment or within 30 days after a revascularization procedure for the qualifying lesion during follow-up; or ischemic stroke or CITS in the territory of the qualifying artery beyond 30 days...
October 17, 2016: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
Tosoni Annalisa, Guidotti Roberto, Del Gratta Cosimo, Committeri Giorgia, Sestieri Carlo
The human ventral occipito-temporal cortex (OTC) contains areas specialized for particular perceptual/semantic categories, such as faces (fusiform face area, FFA) and places (parahippocampal place area, PPA). This organization has been interpreted as reflecting the visual structure of the world, i.e. perceptual similarity and/or eccentricity biases. However, recent functional magnetic resonance imaging (fMRI) studies have shown not only that regions of the OTC are modulated by non-visual, action-related object properties but also by motor planning and execution, although the functional role and specificity of this motor-related activity are still unclear...
October 15, 2016: Neuropsychologia
Thoralf Niendorf, Bert Flemming, Roger G Evans, Erdmann Seeliger
No abstract text is available yet for this article.
November 2016: Radiology
Theodore F Towse, Christopher P Elder, Emily C Bush, Samuel W Klockenkemper, Jared T Bullock, Richard D Dortch, Bruce M Damon
Muscle blood oxygenation-level dependent (BOLD) contrast is greater in magnitude and potentially more influenced by extravascular BOLD mechanisms at 7 T than it is at lower field strengths. Muscle BOLD imaging of muscle contractions at 7 T could, therefore, provide greater or different contrast than at 3 T. The purpose of this study was to evaluate the feasibility of using BOLD imaging at 7 T to assess the physiological responses to in vivo muscle contractions. Thirteen subjects (four females) performed a series of isometric contractions of the calf muscles while being scanned in a Philips Achieva 7 T human imager...
October 18, 2016: NMR in Biomedicine
Ursula F Bailer, Julie C Price, Carolyn C Meltzer, Angela Wagner, Chester A Mathis, Anthony Gamst, Walter H Kaye
OBJECTIVE: Individuals with anorexia nervosa (AN) have anxious and inhibited temperaments with high concern for consequences. Studies using either positron emission tomography (PET) or functional magnetic resonance imaging (fMRI) suggest involvement of the middle and dorsal caudate (DC) in individuals recovered (REC) from AN. For example, dopamine (DA) D2/D3 receptor binding in the middle caudate and DC was associated with anxiety and harm avoidance, and blood-oxygen-level-dependent (BOLD) response in the DC was positively related to trait anxiety...
October 18, 2016: International Journal of Eating Disorders
J C Pang, P A Robinson, K M Aquino, N Vasan
The effects of astrocytic dynamics on the blood oxygen-level dependent (BOLD) response are modeled. The dynamics are represented via an astrocytic response function that approximates the effects of astrocytic activity, including delay between neural activity and hemodynamic response. The astrocytic response function is incorporated into a spatiotemporal hemodynamic model to predict the BOLD response measured using functional magnetic resonance imaging (fMRI). Adding astrocytic dynamics is shown to significantly improve the ability of the model to robustly reproduce the spatiotemporal properties of the experimental data such as characteristic frequency and time-to-peak...
October 14, 2016: NeuroImage
Steven Landers, Elizabeth Madigan, Bruce Leff, Robert J Rosati, Barbara A McCann, Rodney Hornbake, Richard MacMillan, Kate Jones, Kathryn Bowles, Dawn Dowding, Teresa Lee, Tracey Moorhead, Sally Rodriguez, Erica Breese
The Future of Home Health project sought to support transformation of home health and home-based care to meet the needs of patients in the evolving U.S. health care system. Interviews with key thought leaders and stakeholders resulted in key themes about the future of home health care. By synthesizing this qualitative research, a literature review, case studies, and the themes from a 2014 Institute of Medicine and National Research Council workshop on "The Future of Home Health Care," the authors articulate a vision for home-based care and recommend a bold framework for the Medicare-certified home health agency of the future...
November 2016: Home Health Care Management & Practice
Hong Li, Melanie Elphick, Richard Shine
Viviparity (live-bearing) has evolved from oviparity (egg-laying) in more than 100 lineages of squamate reptiles (lizards and snakes). This transition generally has occurred in cool climates, where thermal differentials between eggs in the (cool) nest versus the (warm) maternal oviduct influence embryonic development, in ways that may enhance offspring fitness. To identify specific traits potentially under selection, we incubated eggs of a montane scincid lizard at conditions simulating natural nests, maternal body temperatures, and an intermediate stage (2-week uterine retention of eggs prior to laying)...
October 14, 2016: Oecologia
Zoey J Isherwood, Mark M Schira, Branka Spehar
Natural scenes share a consistent distribution of energy across spatial frequencies (SF) known as the 1/f(α) amplitude spectrum (α ≈ 0.8 - 1.5, mean 1.2). This distribution is scale-invariant, which is a fractal characteristic of natural scenes with statistically similar structure at different spatial scales. While the sensitivity of the visual system to the 1/f properties of natural scenes has been studied extensively using psychophysics, relatively little is known about the tuning of cortical responses to these properties...
October 11, 2016: NeuroImage
Benedikt Wiestler, Anne Kluge, Mathias Lukas, Jens Gempt, Florian Ringel, Jürgen Schlegel, Bernhard Meyer, Claus Zimmer, Stefan Förster, Thomas Pyka, Christine Preibisch
Non-invasive, imaging-based examination of glioma biology has received increasing attention in the past couple of years. To this end, the development and refinement of novel MRI techniques, reflecting underlying oncogenic processes such as hypoxia or angiogenesis, has greatly benefitted this research area. We have recently established a novel BOLD (blood oxygenation level dependent) based MRI method for the measurement of relative oxygen extraction fraction (rOEF) in glioma patients. In a set of 37 patients with newly diagnosed glioma, we assessed the performance of a machine learning model based on multiple MRI modalities including rOEF and perfusion imaging to predict WHO grade...
October 14, 2016: Scientific Reports
Anna Nigri, Eleonora Catricalà, Stefania Ferraro, Maria Grazia Bruzzone, Ludovico D'Incerti, Davide Sattin, Davide Rossi Sebastiano, Silvana Franceschetti, Giorgio Marotta, Riccardo Benti, Matilde Leonardi, Stefano F Cappa
There is a growing interest in the use of functional imaging to assess brain activity in the absence of behavioural responses in patients with disorders of consciousness (DOC). In the present study, we applied a hierarchical auditory stimulation paradigm to functional magnetic resonance (fMRI) in a group of long-term DOC adult patients. Brain response to pairs of pseudowords, of unrelated words and of semantically related words, i.e. stimuli differing in lexical status (words vs. pseudowords) and semantic relatedness (related vs...
October 13, 2016: Brain Imaging and Behavior
Guillaume Marrelec, Arnaud Messé, Alain Giron, David Rudrauf
Brain computation relies on effective interactions between ensembles of neurons. In neuroimaging, measures of functional connectivity (FC) aim at statistically quantifying such interactions, often to study normal or pathological cognition. Their capacity to reflect a meaningful variety of patterns as expected from neural computation in relation to cognitive processes remains debated. The relative weights of time-varying local neurophysiological dynamics versus static structural connectivity (SC) in the generation of FC as measured remains unsettled...
October 2016: PLoS Computational Biology
Yiyun Shou, Martin Sellbom, Jing Xu, Tunong Chen, Aiping Sui
The contemporary knowledge of the construct and operationalization of psychopathy in East Asian countries is still limited. The present paper examines the validity and applicability of the Triarchic Psychopathy Measure (TriPM) based on the triarchic model of psychopathy in Chinese clinical and nonclinical samples. The results of Study 1 using a psychiatric patient sample (N = 193) showed that the pattern of associations between the TriPM scales (Boldness, Meanness, and Disinhibition) and the 3 factors (Egocentricity, Callous, and Antisocial) of the Levenson Self-Report Psychopathy Scale were similar to previous studies using English-speaking samples...
October 13, 2016: Psychological Assessment
Chiara Sarappa, Elena Salvatore, Alessandro Filla, Sirio Cocozza, Cinzia Valeria Russo, Francesco Saccà, Arturo Brunetti, Giuseppe De Michele, Mario Quarantelli
The fractional Amplitude of Low Frequency Fluctuations (fALFF) and the degree of local synchronization (Regional Homogeneity - ReHo) of resting-state BOLD signal have been suggested to map spontaneous neuronal activity and local functional connectivity, respectively. We compared voxelwise, independent of atrophy, the fALFF and ReHo patterns of 11 presymptomatic (ps-HD) and 28 symptomatic (sHD) Huntington's disease mutation carriers, with those of 40 normal volunteers, and tested their possible correlations with the motor and cognitive subscores of the Unified Huntington's Disease Rating Scale...
October 12, 2016: Brain Imaging and Behavior
Kyriaki Mikellidou, André D Gouws, Hannah Clawson, Peter Thompson, Antony B Morland, Bruce D Keefe
We use the simple, but prominent Helmholtz's squares illusion in which a vertically striped square appears wider than a horizontally striped square of identical physical dimensions to determine whether functional magnetic resonance imaging (fMRI) BOLD responses in V1 underpin illusions of size. We report that these simple stimuli which differ in only one parameter, orientation, to which V1 neurons are highly selective elicited activity in V1 that followed their physical, not perceived size. To further probe the role of V1 in the illusion and investigate plausible extrastriate visual areas responsible for eliciting the Helmholtz squares illusion, we performed a follow-up transcranial magnetic stimulation (TMS) experiment in which we compared perceptual judgments about the aspect ratio of perceptually identical Helmholtz squares when no TMS was applied against selective stimulation of V1, LO1, or LO2...
September 2016: I-Perception
Richard J Bold
No abstract text is available yet for this article.
October 12, 2016: JAMA Surgery
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