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https://www.readbyqxmd.com/read/28229461/how-different-is-a-3d-printed-replica-from-a-conspecific-in-the-eyes-of-a-zebrafish
#1
Tommaso Ruberto, Giovanni Polverino, Maurizio Porfiri
Robotics is emerging as a promising tool for aiding research on animal behavior. The possibility of generating customizable, controllable, and standardized robotic stimuli has been demonstrated through a number of behavioral assays, involving vertebrates and invertebrates. However, the specific appraisal of the nature of robotic stimuli is currently lacking. Here, we attempt to evaluate this aspect in zebrafish, through a within-subject design in which experimental subjects are faced with three experimental conditions...
February 22, 2017: Journal of the Experimental Analysis of Behavior
https://www.readbyqxmd.com/read/28228081/the-neurobiology-and-psychiatric-perspective-of-vaginismus-linking-the-pharmacological-and-psycho-social-interventions
#2
Zuri Shahidii Kadir, Hatta Sidi, Jaya Kumar, Srijit Das, Marhani Midin, Najwa Baharuddin
Vaginismus is an involuntary muscle contraction of the outer third of vaginal barrel causing sexual penetration almost impossible. It is generally classified under sexual pain disorder (SPD). In Diagnostic and Statistical Manual, 5th edition, it is classified under the new rubric of Genito-Pelvic Pain/Sexual Penetration Disorder. This fear-avoidance condition poses an ongoing significant challenge to the medical and health professionals due to the very demanding needs in health care despite its unpredictable prognosis...
February 22, 2017: Current Drug Targets
https://www.readbyqxmd.com/read/28226431/virtual-reality-applications-in-assessing-the-effect-of-anxiety-on-sensorimotor-integration-in-human-postural-control
#3
Christopher Widdowson, Jatin Ganhotra, Mohammed Faizal, Marissa Wilko, Saurin Parikh, Zainulabidin Adhami, Manuel E Hernandez, Christopher Widdowson, Jatin Ganhotra, Mohammed Faizal, Marissa Wilko, Saurin Parikh, Zainulabidin Adhami, Manuel E Hernandez, Marissa Wilko, Zainulabidin Adhami, Manuel E Hernandez, Saurin Parikh, Mohammed Faizal, Jatin Ganhotra, Christopher Widdowson
Falls are a leading cause of injury and mortality among adults over the age of 65 years. Given the strong relation between fear of falling and fall risk, identification of the mechanisms that underlie anxiety-related changes in postural control may pave the way to the development of novel therapeutic strategies aimed at reducing fall risk in older adults. First, we review potential mechanisms underlying anxiety-mediated changes in postural control in older adults with and without neurological conditions. We then present a system that allows for the simultaneous recording of neural, physiological, and behavioral data in an immersive virtual reality (VR) environment while implementing sensory and mechanical perturbations to evaluate alterations in sensorimotor integration under conditions with high postural threat...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226306/task-dependent-modulation-of-amygdala-connectivity-in-social-anxiety-disorder
#4
Lora Minkova, Ronald Sladky, Georg S Kranz, Michael Woletz, Nicole Geissberger, Christoph Kraus, Rupert Lanzenberger, Christian Windischberger
Increased amygdala activation is consistently found in patients suffering from social anxiety disorder (SAD), a psychiatric condition characterized by an intense fear of social situations and scrutiny. Disruptions in the amygdalar-frontal network in SAD may explain the inability of frontal regions to appropriately down-regulate amygdalar hyper-activation. In this study, we measured 15 SAD patients and 15 healthy controls during an affective counting Stroop task with emotional faces to assess the interaction of affective stimuli with a cognitive task in SAD, as well as to investigate the causal interactions between the amygdala and the medial orbitofrontal cortex (OFC) using dynamic causal modeling (DCM)...
February 9, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/28225822/a-reconfiguration-of-the-sex-trade-how-social-and-structural-changes-in-eastern-zimbabwe-left-women-involved-in-sex-work-and-transactional-sex-more-vulnerable
#5
Jocelyn Elmes, Morten Skovdal, Kundai Nhongo, Helen Ward, Catherine Campbell, Timothy B Hallett, Constance Nyamukapa, Peter J White, Simon Gregson
Understanding the dynamic nature of sex work is important for explaining the course of HIV epidemics. While health and development interventions targeting sex workers may alter the dynamics of the sex trade in particular localities, little has been done to explore how large-scale social and structural changes, such as economic recessions-outside of the bounds of organizational intervention-may reconfigure social norms and attitudes with regards to sex work. Zimbabwe's economic collapse in 2009, following a period (2000-2009) of economic decline, within a declining HIV epidemic, provides a unique opportunity to study community perceptions of the impact of socio-economic upheaval on the sex trade...
2017: PloS One
https://www.readbyqxmd.com/read/28221081/threat-intensity-widens-fear-generalization-gradients
#6
Joseph E Dunsmoor, Marijn C W Kroes, Stephen H Braren, Elizabeth A Phelps
Research in nonhuman animals reveals threat-sensitive generalization of defensive behavior that favors widespread generalization when threat intensity is high and limited generalization (i.e., specificity) when threat intensity is low. Here, we used Pavlovian fear conditioning to systematically investigate whether threat intensity widens behavioral generalization gradients to stimuli that decreasingly resemble a learned threat cue. Using a between-subjects design, volunteers underwent fear conditioning with a tone paired with either a high-intensity or low-intensity aversive stimulus prior to a test of fear generalization to novel tones...
February 20, 2017: Behavioral Neuroscience
https://www.readbyqxmd.com/read/28219654/worry-inducing-stimuli-in-an-aversive-go-nogo-task-enhance-reactive-control-in-individuals-with-lower-trait-anxiety
#7
Anja Leue, Carmen Cano Rodilla, André Beauducel
This study relates predictions on reactive and proactive cognitive control to findings on anxious apprehension/worry and ERN/Ne. We investigated whether worry-inducing stimuli in an aversive performance setting lead to a more pronounced increase of the ERN/Ne in individuals with lower anxious apprehension/worry. We also explored the N2 amplitude in the context of worry-inducing stimuli. Fifty-eight participants performed an extended Go/NoGo task. A neutral or fearful face was presented at the beginning of each trial, with the fearful face as a worry-inducing, distracting stimulus...
February 17, 2017: Biological Psychology
https://www.readbyqxmd.com/read/28219262/individual-differences-in-the-flexibility-of-peripersonal-space
#8
Samuel B Hunley, Arwen M Marker, Stella F Lourenco
The current study investigated individual differences in the flexibility of peripersonal space (i.e., representational space near the body), specifically in relation to trait claustrophobic fear (i.e., fear of suffocating or being physically restricted). Participants completed a line bisection task with either a laser pointer (Laser condition), allowing for a baseline measure of the size of one's peripersonal space, or a stick (Stick condition), which produces expansion of one's peripersonal space. Our results revealed that individuals high in claustrophobic fear had larger peripersonal spaces than those lower in claustrophobic fear, replicating previous research...
January 2017: Experimental Psychology
https://www.readbyqxmd.com/read/28218248/shared-mechanism-for-emotion-processing-in-adolescents-with-and-without-autism
#9
Christina Ioannou, Marwa El Zein, Valentin Wyart, Isabelle Scheid, Frédérique Amsellem, Richard Delorme, Coralie Chevallier, Julie Grèzes
Although, the quest to understand emotional processing in individuals with Autism Spectrum Disorders (ASD) has led to an impressive number of studies, the picture that emerges from this research remains inconsistent. Some studies find that Typically Developing (TD) individuals outperform those with ASD in emotion recognition tasks, others find no such difference. In this paper, we move beyond focusing on potential group differences in behaviour to answer what we believe is a more pressing question: do individuals with ASD use the same mechanisms to process emotional cues? To this end, we rely on model-based analyses of participants' accuracy during an emotion categorisation task in which displays of anger and fear are paired with direct vs...
February 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28217289/peripheral-surgical-wounding-may-induce-cognitive-impairment-through-interlukin-6-dependent-mechanisms-in-aged-mice
#10
Yuanlin Dong, Zhipeng Xu, Lining Huang, Yiying Zhang, Zhongcong Xie
Post-operative cognitive dysfunction (POCD) is associated with morbidity, mortality and increased cost of medical care. However, the neuropathogenesis and targeted interventions of POCD remain largely to be determined. We have found that the peripheral surgical wounding induces an age-dependent Aβ accumulation, neuroinflammation and cognitive impairment in aged mice. Pro-inflammatory cytokine interlukin-6 (IL-6) has been reported to be associated with cognitive impairment in rodents and humans. However, the role of IL-6 in the neuropathogenesis of POCD is unknown...
October 2016: Medical Gas Research
https://www.readbyqxmd.com/read/28215623/higher-locus-coeruleus-mri-contrast-is-associated-with-lower-parasympathetic-influence-over-heart-rate-variability
#11
Mara Mather, Hyun Joo Yoo, David V Clewett, Tae-Ho Lee, Steven G Greening, Allison Ponzio, Jungwon Min, Julian F Thayer
The locus coeruleus (LC) is a key node of the sympathetic nervous system and suppresses parasympathetic activity that would otherwise increase heart rate variability. In the current study, we examined whether LC-MRI contrast reflecting neuromelanin accumulation in the LC was associated with high-frequency heart rate variability (HF-HRV), a measure reflecting parasympathetic influences on the heart. Recent evidence indicates that neuromelanin, a byproduct of catchecholamine metabolism, accumulates in the LC through young and mid adulthood, suggesting that LC-MRI contrast may be a useful biomarker of individual differences in habitual LC activation...
February 16, 2017: NeuroImage
https://www.readbyqxmd.com/read/28214770/masked-emotional-priming-a-double-dissociation-between-direct-and-indirect-effects-reveals-non-conscious-processing-of-emotional-information-beyond-valence
#12
Dirk Wentura, Michaela Rohr, Juliane Degner
We demonstrate non-conscious processing beyond valence by employing the masked emotional priming paradigm (Rohr, Degner, & Wentura, 2012) with a stimulus-onset asynchrony (SOA) variation. Emotional faces were briefly presented and directly masked, followed by the target face, using a SOA of either 43ms or 143ms. Targets were categorized as happy, angry, fearful, or sad. With short SOA, we replicated the differentiated priming effect within the negative domain (i.e., angry differentiate from fearful/sad). A direct test of prime awareness indicated that primes could not be discriminated consciously in this condition...
February 16, 2017: Consciousness and Cognition
https://www.readbyqxmd.com/read/28214541/think-twice-it-s-all-right-long-lasting-effects-of-disrupted-reconsolidation-on-brain-and-behavior-in-human-long-term-fear
#13
Johannes Björkstrand, Thomas Agren, Fredrik Åhs, Andreas Frick, Elna-Marie Larsson, Olof Hjorth, Tomas Furmark, Mats Fredrikson
Memories can be modified when recalled. Experimental fear conditioning studies support that amygdala-localized fear memories are attenuated when reconsolidation is disrupted through extinction training immediately following memory activation. Recently, using functional brain imaging in individuals with lifelong spider fears, we demonstrated that fear memory activation followed by repeated exposure to feared cues after 10min, thereby disrupting reconsolidation, attenuated activity in the amygdala during later re-exposure, and also facilitated approach behavior to feared cues...
February 16, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28213636/decrease-of-glial-cell-derived-neurotrophic-factor-contributes-to-anesthesia-and-surgery-induced-learning-and-memory-dysfunction-in-neonatal-rats
#14
Lingli Gui, Xi Lei, Zhiyi Zuo
: Long duration of anesthesia may induce toxicity in the developing brain. However, little is known about the effects of the combination of surgery and anesthesia on the developing brain. The mechanisms for the effects are not clear. To determine these effects, postnatal day 7 male and female Sprague-Dawley rats were exposed to 3% sevoflurane for 2 h with or without right common carotid exposure. Pyrrolidine dithiocarbamate (PDTC), an anti-inflammatory agent, was given 30 min before and 6 h after the carotid exposure...
February 17, 2017: Journal of Molecular Medicine: Official Organ of the "Gesellschaft Deutscher Naturforscher und Ärzte"
https://www.readbyqxmd.com/read/28213516/rapid-regulation-of-sialidase-activity-in-response-to-neural-activity-and-sialic-acid-removal-during-memory-processing-in-rat-hippocampus
#15
Akira Minami, Yuko Meguro, Sayaka Ishibashi, Ami Ishii, Mako Shiratori, Saki Sai, Yuuki Horii, Hirotaka Shimizu, Hokuto Fukumoto, Sumika Shinba, Risa Taguchi, Tadanobu Takahashi, Tadamune Otsubo, Kiyoshi Ikeda, Takashi Suzuki
Sialidase cleaves sialic acids on the extracellular cell surface as well as inside the cell, and is necessary for normal long-term potentiation (LTP) at MF-CA3 pyramidal cell synapses and for hippocampus-dependent spatial memory. Here, we investigated in detail the role of sialidase in memory processing. Sialidase activity measured with 4MU-Neu5Ac or X-Neu5Ac and FRV LB was increased by high K(+)-induced membrane depolarization. Sialidase activity was also increased by chemical LTP induction with forskolin and activation of BDNF signaling, non-NMDARs or NMDARs...
February 17, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28212946/divergent-effects-of-brain-interleukin-1%C3%A3-in-mediating-fever-lethargy-anorexia-and-conditioned-fear-memory
#16
Tamzyn L Baartman, Tanya Swanepoel, Ruth M Barrientos, Helen P Laburn, Duncan Mitchell, Lois M Harden
The influence of brain interleukin-1 (IL-1ß) on memory processes includes both detrimental and beneficial effects. To further explore the dynamics of brain IL-1ß in mediating learning and memory during acute sickness, we injected species-homologous rat IL-1ß (100ng/5μl) or vehicle (0.1% bovine serum albumin, 5μl) directly into the cisterna magna (i.c.m.) of male Sprague-Dawley rats. We measured, in parallel, body temperature, food intake, body mass, cage activity, as well as learning and memory using contextual fear conditioning...
February 14, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28212942/activation-of-type-4-dopaminergic-receptors-in-the-prelimbic-area-of-medial-prefrontal-cortex-is-necessary-for-the-expression-of-innate-fear-behavior
#17
Macarena D Vergara, Victor N Keller, José A Fuentealba, Katia Gysling
The prelimbic area (PL) of the medial Prefrontal cortex (mPFC) is involved in the acquisition and expression of conditioned and innate fear. Both types of fear share several neuronal pathways. It has been documented that dopamine (DA) plays an important role in the regulation of aversive memories in the mPFC. The exposure to an aversive stimulus, such as the smell of a predator odor or the exposure to footshock stress is accompanied by an increase in mPFC DA release. Evidence suggests that the type 4 dopaminergic receptor (D4R) is the molecular target through which DA modulates fear expression...
February 14, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28210990/indices-from-lagged-poincare-plots-of-heart-rate-variability-an-efficient-nonlinear-tool-for-emotion-discrimination
#18
Ateke Goshvarpour, Ataollah Abbasi, Atefeh Goshvarpour
Interest in human emotion recognition, regarding physiological signals, has recently risen. In this study, an efficient emotion recognition system, based on geometrical analysis of autonomic nervous system signals, is presented. The electrocardiogram recordings of 47 college students were obtained during rest condition and affective visual stimuli. Pictures with four emotional contents, including happiness, peacefulness, sadness, and fear were selected. Then, ten lags of Poincare plot were constructed for heart rate variability (HRV) segments...
February 16, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28210930/emotion-specific-nocebo-effects-an-fmri-study
#19
Anne Schienle, Carina Höfler, Sonja Übel, Albert Wabnegger
The neurobiological mechanisms of nocebos are still poorly understood. Thirty-eight women participated in a 'smell study' using functional magnetic resonance imaging. They were presented with an odorless stimulus (distilled water) together with the verbal suggestion that this fluid has an aversive odor which enhances disgust feelings. The nocebo was presented while the participants viewed disgusting, fear-inducing, and neutral images. Participants' affective and neuronal responses during nocebo administration were compared with those in a control condition without nocebo...
February 16, 2017: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/28210521/the-right-to-die-in-chronic-disorders-of-consciousness-can-we-avoid-the-slippery-slope-argument
#20
REVIEW
Rocco Salvatore Calabrò, Antonino Naro, Rosaria De Luca, Margherita Russo, Lory Caccamo, Alfredo Manuli, Alessia Bramanti, Placido Bramanti
Managing individuals with chronic disorders of consciousness raises ethical questions about the appropriateness of maintaining life-sustaining treatments and end-of-life decisions for those who are unable to make decisions for themselves. For many years, the positions fostering the "sanctity" of human life (i.e., life is inviolable in any case) have led to maintaining life-sustaining treatments (including artificial nutrition and hydration) in patients with disorders of consciousness, allowing them to live for as long as possible...
November 2016: Innovations in Clinical Neuroscience
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