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https://www.readbyqxmd.com/read/29134082/is-the-behavioural-divergence-between-range-core-and-range-edge-populations-of-cane-toads-rhinella-marina-due-to-evolutionary-change-or-developmental-plasticity
#1
Jodie Gruber, Gregory Brown, Martin J Whiting, Richard Shine
Individuals at the leading edge of expanding biological invasions often show distinctive phenotypic traits, in ways that enhance their ability to disperse rapidly and to function effectively in novel environments. Cane toads (Rhinella marina) at the invasion front in Australia exhibit shifts in morphology, physiology and behaviour (directionality of dispersal, boldness, risk-taking). We took a common-garden approach, raising toads from range-core and range-edge populations in captivity, to see if the behavioural divergences observed in wild-caught toads are also evident in common-garden offspring...
October 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/29133433/attention-priority-map-of-face-images-in-human-early-visual-cortex
#2
Ce Mo, Dongjun He, Fang Fang
Attention priority maps are topographic representations that are utilized for attention selection and guidance of task-related behavior during visual processing. Previous studies have identified attention priority maps of simple artificial stimuli in multiple cortical and subcortical areas, while investigating neural correlates of priority maps of natural stimuli is complicated by the complexity of their spatial structure and the difficulty of behaviorally characterizing their priority map. To overcome these challenges, we reconstructed the topographic representations of upright/invered face images from fMRI BOLD signals in human early visual areas V1-V3 based on a voxel-wise population receptive field model and behaviorally characterized the priority map as the first saccadic eye movement pattern when subjects performed a face matching task, relative to the condition in which subjects performed a phase-scrambled face matching task...
November 13, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29130695/a-test-of-the-empirical-profile-and-coherence-of-the-dsm-5-psychopathy-specifier
#3
Joshua D Miller, Joanna Lamkin, Jessica L Maples-Keller, Chelsea E Sleep, Donald R Lynam
The Diagnostic and Statistical Manual of Mental Disorders-5th edition (DSM-5; American Psychiatric Association, 2013) introduced a psychopathy specifier (DSM-5 PS) as part of the Section III diagnostic model of antisocial personality disorder. Designed to capture the construct of fearless dominance/boldness, the DSM-5 PS is assessed on the basis of the presence of low scores on traits of withdrawal and anxiousness, and high scores on attention seeking. These constructs have garnered attention in the past decade but are the subject of substantial debate as to their role in the conceptualization and assessment of psychopathy, given their limited relations to the maladaptive outcomes typically associated with this personality disorder...
November 13, 2017: Psychological Assessment
https://www.readbyqxmd.com/read/29130510/heterogenous-migraine-aura-symptoms-correlate-with-visual-cortex-fmri-responses
#4
Nanna Arngrim, Anders Hougaard, Khazar Ahmadi, Mark Bitsch Vestergaard, Henrik Winther Schytz, Faisal Mohammad Amin, Henrik Bo Wiberg Larsson, Jes Olesen, Michael B Hoffmann, Messoud Ashina
OBJECTIVE: Migraine aura is sparsely studied due to the highly challenging task of capturing patients during aura. Cortical spreading depression (CSD) is likely the underlying phenomenon of aura. The possible correlation between the multifaceted phenomenology of aura symptoms and the effects of CSD on the brain has not been ascertained. METHODS: Five migraine patients were studied during various forms of aura symptoms induced by hypoxia, sham or physical exercise and photostimulation...
November 11, 2017: Annals of Neurology
https://www.readbyqxmd.com/read/29128522/biological-evidence-for-attention-bias-to-food-emotional-dysregulation-disinhibition-and-deficient-somatosensory-awareness-in-obesity-with-binge-eating-disorder
#5
Roni Aviram-Friedman, Nerys Astbury, Christopher N Ochner, Isobel Contento, Allan Geliebter
OBJECTIVES: To refine the biobehavioral markers of binge eating disorder (BED). METHODS: We conducted fMRI brain scans using images of high energy processed food (HEPF), low energy unprocessed food (LEUF), or non-foods (NF) in 42 adults (obese with BED [obese -BED; n=13] and obese with no BED [obese non-BED; n=29]) selected via ads. Two blood oxygenated level dependent (BOLD) signal contrast maps were examined: food versus nonfood, and HEPF versus LEUF. In addition, score differences on the disinhibition scale were correlated with BOLD signals...
November 8, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/29128142/longitudinal-effects-of-cognitive-behavioral-therapy-for-depression-on-the-neural-correlates-of-emotion-regulation
#6
Harry Rubin-Falcone, Jochen Weber, Ronit Kishon, Kevin Ochsner, Lauren Delaparte, Bruce Doré, Francesca Zanderigo, Maria A Oquendo, J John Mann, Jeffrey M Miller
Cognitive behavioral therapy (CBT) is effective for a substantial minority of patients suffering from major depressive disorder (MDD), but its mechanism of action at the neural level is not known. As core techniques of CBT seek to enhance emotion regulation, we scanned 31 MDD participants prior to 14 sessions of CBT using functional magnetic resonance imaging (fMRI) and a task in which participants engaged in a voluntary emotion regulation strategy while recalling negative autobiographical memories. Eighteen healthy controls were also scanned...
November 8, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/29126965/brain-state-expression-and-transitions-are-related-to-complex-executive-cognition-in-normative-neurodevelopment
#7
John D Medaglia, Theodore D Satterthwaite, Apoorva Kelkar, Rastko Ciric, Tyler M Moore, Kosha Ruparel, Ruben C Gur, Raquel E Gur, Danielle S Bassett
Adolescence is marked by rapid development of executive function. Mounting evidence suggests that executive function in adults may be driven by dynamic control of neurophysiological processes. Yet, how these dynamics evolve over adolescence and contribute to cognitive development is unknown. In a sample of 780 youth aged 8-22 yr (42.7% male) from the Philadelphia Neurodevelopment Cohort, we use a dynamic graph approach to extract activation states in BOLD fMRI data from 264 brain regions. We construct a graph in which each moment in time is a node and the similarity in brain states at two different times is an edge...
November 7, 2017: NeuroImage
https://www.readbyqxmd.com/read/29126709/corrigendum-to-mapping-the-end-tidal-co2-response-function-in-the-resting-state-bold-fmri-signal-spatial-specificity-test-retest-reliability-and-effect-of-fmri-sampling-rate
#8
A M Golestani, C Chang, J B Kwinta, Y B Khatamian, J J Chen
No abstract text is available yet for this article.
November 7, 2017: NeuroImage
https://www.readbyqxmd.com/read/29125796/a-bold-goal-more-healthy-days-through-improved-community-health
#9
Tristan Cordier, Yongjia Song, Jesse Cambon, Gil S Haugh, Mark Steffen, Patty Hardy, Marnie Staehly, Angela Hagan, Vipin Gopal, Pattie Dale Tye, Andrew Renda
Humana, a large health care company, has set a goal of 20% improvement in health in the communities it serves by 2020. The metric chosen for the Bold Goal initiative was the HRQOL-4 version of the Centers for Disease Control and Prevention (CDC) Healthy Days survey. This paper presents the methods for measuring progress, reports results for the first year of tracking, and describes Humana's community-based interventions. Across 7 specially designated "Bold Goal" communities, mean unhealthy days declined from 10...
November 10, 2017: Population Health Management
https://www.readbyqxmd.com/read/29122668/estimation-of-physiological-sources-of-nonlinearity-in-blood-oxygenation-level-dependent-contrast-signals
#10
Daehun Kang, Yul-Wan Sung, Satoshi Shioiri
Blood oxygenation level-dependent (BOLD) contrast appears through a variation in the transverse relaxation rate of magnetic resonance signals induced by neurovascular coupling and is known to have nonlinear characteristics along echo time (TE) due to the intra-vasculature. However, the physiological causes of this nonlinearity are unclear. We attempted to estimate the physiological information related to the nonlinearity of BOLD signals by using a two-compartment model. For this purpose, we used a multi-echo gradient-echo echo-planar imaging sequence and developed a computational method to estimate the physiological information from the TE-dependent BOLD signals...
November 6, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/29121642/limbic-system-damage-in-ms-mri-assessment-and-correlations-with-clinical-testing
#11
Jie Wen, Dmitriy A Yablonskiy, Amber Salter, Anne H Cross
Volume loss in some limbic region structures has been observed in multiple sclerosis (MS) patients. However, in vivo evaluation of existing tissue cellular microstructure integrity has received less attention. The goal of studies reported here was to quantitatively assess loss of limbic system volumes and tissue integrity, and to evaluate associations of these measures with cognitive and physical dysfunction in MS patients. Thirty-one healthy controls (HC) and 80 MS patients, including 32 relapsing remitting (RRMS), 32 secondary progressive (SPMS) and 16 primary progressive (PPMS), participated in this study...
2017: PloS One
https://www.readbyqxmd.com/read/29121545/higher-order-cognitive-training-effects-on-processing-speed-related-neural-activity-a-randomized-trial
#12
Michael A Motes, Uma S Yezhuvath, Sina Aslan, Jeffrey S Spence, Bart Rypma, Sandra B Chapman
Higher-order cognitive training has shown to enhance performance in older adults, but the neural mechanisms underlying performance enhancement have yet to be fully disambiguated. This randomized trial examined changes in processing speed and processing speed-related neural activity in older participants (57-71 years of age) who underwent cognitive training (CT, N = 12) compared with wait-listed (WLC, N = 15) or exercise-training active (AC, N = 14) controls. The cognitive training taught cognitive control functions of strategic attention, integrative reasoning, and innovation over 12 weeks...
October 12, 2017: Neurobiology of Aging
https://www.readbyqxmd.com/read/29120276/personality-disorder-features-and-paraphilic-interests-among-undergraduates-differential-relations-and-potential-antecedents
#13
Ashley L Watts, Madeline G Nagel, Robert D Latzman, Scott O Lilienfeld
We examined the relations between: (1) narcissism, psychopathy, DSM-5 personality disorder symptom counts; and (2) paraphilic interests among undergraduates (N = 608). Base rates of paraphilic interests were appreciable. The disinhibition and meanness features of psychopathy and the entitlement and exploitativeness features of narcissism were robustly associated with paraphilic interests, particularly sexual sadism, whereas the boldness features of narcissism and psychopathy were essentially unrelated to these interests...
November 9, 2017: Journal of Personality Disorders
https://www.readbyqxmd.com/read/29120196/psychopathy-and-heroism-in-first-responders-traits-cut-from-the-same-cloth
#14
Christina L Patton, Sarah Francis Smith, Scott O Lilienfeld
Some scholars have posited that certain traits associated with psychopathy-namely, fearlessness, boldness, and willingness to take risks-are associated with greater engagement in heroic and altruistic acts; nevertheless, this conjecture has received little empirical attention. We examined the relations among psychopathic traits, heroism, altruism, workplace deviance, and leadership in first-responder (n = 138) and civilian (n = 104) samples recruited by means of an online platform. Across samples, fearless dominance, boldness, sensation seeking, and several other psychopathy-related variables were positively and significantly associated with everyday heroism and altruism...
November 9, 2017: Personality Disorders
https://www.readbyqxmd.com/read/29118108/network-configurations-in-the-human-brain-reflect-choice-bias-during-rapid-face-processing
#15
Tao Tu, Noam Schneck, Jordan Muraskin, Paul Sajda
Network interactions are likely to be instrumental in processes underlying rapid perception and cognition. Specifically, high-level and perceptual regions must interact to balance pre-existing models of the environment with new incoming stimuli. Simultaneous EEG/fMRI allows for the temporal characterization of brain-network interactions combined with improved anatomical localization of regional activity. In this paper we use simultaneous EEG/fMRI and multivariate dynamical systems (MDS) analysis to characterize network relationships between constitute brain areas that reflect a subject's choice for a face versus non-face categorization task...
November 8, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29117849/seeking-ways-to-inform-the-uninformed-improving-the-informed-consent-process-in-online-social-science-research
#16
Evan K Perrault, David M Keating
Participants often do not read consent forms in social science research. This is not surprising, especially for online studies, given they do not typically offer greater risk than what is encountered in daily life. However, if no one is reading, are participants really informed? This study used previous research to craft experimentally manipulated consent forms utilizing different visual presentations (e.g., greater use of line spacing, bullets, bolding, diagrams). Participants ( n = 547) were randomly exposed to one of seven form variations...
November 1, 2017: Journal of Empirical Research on Human Research Ethics: JERHRE
https://www.readbyqxmd.com/read/29117709/detecting-perfusion-pattern-based-on-the-background-low-frequency-fluctuation-in-resting-state-functional-mri-data-and-its-influence-on-resting-state-networks-an-iterative-post-processing-approach
#17
Tianyi Qian, Davide Zanchi, Cristelle Rodriguez, Marine Ackermann, Panteleimon Giannakopoulos, Sven Haller
INTRODUCTION: RS-fMRI is based on the assumption that the vascular response and the blood oxygenation level dependent (BOLD) response are homogenous across the entire brain. However, this a priori hypothesis is not consistent with the well-known variability of cerebral vascular territories. In order to explore whether the RS networks are influenced by varied vascular speed in different vascular territories, we assessed the time-shift maps that give an estimate of the local timing of the vascular response and check whether local differences in this timing have an impact on the estimates of RS networks...
November 8, 2017: Brain Connectivity
https://www.readbyqxmd.com/read/29113406/altered-dmn-functional-connectivity-and-regional-homogeneity-in-partial-epilepsy-patients-a-seventy-cases-study
#18
Chong-Yu Hu, Xiaoping Gao, Lili Long, Xiaoyan Long, Chaorong Liu, Yayu Chen, Yuanyuan Xie, Chujuan Liu, Bo Xiao, Zhe-Yu Hu
Purpose: Clinically diagnosed partial epilepsy is hard to be functionally diagnosed by regular electroencephalograph (EEG) and conventional magnetic resonance imaging (MRI). By collecting transient brain regional signals, blood oxygenation level-dependent (BOLD) function MRI (BOLD-fMRI) can provide brain function change information with high accuracy. By using resting state BOLD-fMRI technique, we aim to investigate the changes of brain function in partial epilepsy patients. Methods: BOLD-fMRI scanning was performed in 70 partial epilepsy and 70 healthy people...
October 6, 2017: Oncotarget
https://www.readbyqxmd.com/read/29113023/metabarcoding-of-freshwater-invertebrates-to-detect-the-effects-of-a-pesticide-spill
#19
Carmelo Andújar, Paula Arribas, Clare Gray, Katherine Bruce, Guy Woodward, Douglas W Yu, Alfried P Vogler
Biomonitoring underpins the environmental assessment of freshwater ecosystems and guides management and conservation. Current methodology for surveys of (macro)invertebrates uses coarse taxonomic identification where species-level resolution is difficult to obtain. Next-generation sequencing of entire assemblages (metabarcoding) provides a new approach for species detection, but requires further validation. We used metabarcoding of invertebrate assemblages with two fragments of the cox1 "barcode" and partial nuclear ribosomal (SSU) genes, to assess the effects of a pesticide spill in the River Kennet (Southern England)...
November 7, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/29108941/both-hyper-and-hypo-activation-to-cognitive-challenge-are-associated-with-increased-beta-amyloid-deposition-in-healthy-aging-a-nonlinear-effect
#20
Chris M Foster, Kristen M Kennedy, Marci M Horn, David A Hoagey, Karen M Rodrigue
Beta-amyloid (Aβ) positive individuals hyper-activate brain regions compared to those not at-risk; however, hyperactivation is then thought to diminish as Alzheimer's disease symptomatology begins, evidencing eventual hypoactivation. It remains unclear when in the disease staging this transition occurs. We hypothesized that differential levels of amyloid burden would be associated with both increased and decreased activation (i.e., a quadratic trajectory) in cognitively-normal adults. Participants (N = 62; aged 51-94) underwent an fMRI spatial distance-judgment task and Amyvid-PET scanning...
November 3, 2017: NeuroImage
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