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Signal detection theory

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https://www.readbyqxmd.com/read/27914525/protective-effects-of-huanglian-wendan-decoction-aganist-cognitive-deficits-and-neuronal-damages-in-rats-with-diabetic-encephalopathy-by-inhibiting-the-release-of-inflammatory-cytokines-and-repairing-insulin-signaling-pathway-in-hippocampus
#1
Yue-Bi Li, Wei-Hua Zhang, Hua-Dong Liu, Zhou Liu, Shi-Ping Ma
Huanglian Wendan decoction (HLWDD) has been used for the treatment of symptom of "Re", one of major causes in diabetes and metabolic disorders, according to the theory of traditional Chinese medicine. The present study aimed at investigating the cerebral protective effects of HLWDD on diabetic encephalopathy (DE), one of the major diabetic complications. The effects of HLWDD and metformin were analyzed in the streptozocin (STZ) + high-glucose-fat (HGF) diet-induced DE rats by gastric intubation. In the present study, the effects of HLWDD on cognition deficits were investigated after 30-day intervention at two daily dose levels (3 and 6 g·kg(-1))...
November 2016: Chinese Journal of Natural Medicines
https://www.readbyqxmd.com/read/27907025/measuring-social-motivation-using-signal-detection-and-reward-responsiveness
#2
Coralie Chevallier, Natasha Tonge, Lou Safra, David Kahn, Gregor Kohls, Judith Miller, Robert T Schultz
BACKGROUND: Recent trends in psychiatry have emphasized the need for a shift from categorical to dimensional approaches. Of critical importance to this transformation is the availability of tools to objectively quantify behaviors dimensionally. The present study focuses on social motivation, a dimension of behavior that is central to a range of psychiatric conditions but for which a particularly small number of assays currently exist. METHODS: In Study 1 (N = 48), healthy adults completed a monetary reward task and a social reward task, followed by completion of the Chapman Physical and Social Anhedonia Scales...
2016: PloS One
https://www.readbyqxmd.com/read/27903008/brightness-in-human-rod-vision-depends-on-slow-neural-adaptation-to-quantum-statistics-of-light
#3
Michael E Rudd, Fred Rieke
In human rod-mediated vision, threshold for small, brief flashes rises in proportion to the square root of adapting luminance at all but the lowest and highest adapting intensities. A classical signal detection theory from Rose (1942, 1948) and de Vries (1943) attributed this rise to the perceptual masking of weak flashes by Poisson fluctuations in photon absorptions from the adapting field. However, previous work by Brown and Rudd (1998) demonstrated that the square-root law also holds for suprathreshold brightness judgments, a finding that supports an alternative explanation of the square-root sensitivity changes as a consequence of physiological adaptation (i...
November 1, 2016: Journal of Vision
https://www.readbyqxmd.com/read/27891687/effect-of-preceding-stimulation-on-sound-localization-and-its-representation-in-the-auditory-midbrain
#4
Sandra Tolnai, Rainer Beutelmann, Georg M Klump
Prior stimulation can influence the perception of sound source location. Some psychophysical sound localization procedures differ in the amount of prior stimulation, which may affect measures of localization accuracy. If and how particularly the number of preceding stimuli affects sound localization and the neural representation of sound source position has not been investigated so far and will be the focus of the present report. We trained Mongolian gerbils in a left/right discrimination task where the target stimulus was preceded by silence or followed a number of reference stimuli...
November 27, 2016: European Journal of Neuroscience
https://www.readbyqxmd.com/read/27890161/primary-or-secondary-tasks-dual-task-interference-between-cyclist-hazard-perception-and-cadence-control-using-cross-modal-sensory-aids-with-rider-assistance-bike-computers
#5
Chao-Yang Yang, Cheng-Tse Wu
This research investigated the risks involved in bicycle riding while using various sensory modalities to deliver training information. To understand the risks associated with using bike computers, this study evaluated hazard perception performance through lab-based simulations of authentic riding conditions. Analysing hazard sensitivity (d') of signal detection theory, the rider's response time, and eye glances provided insights into the risks of using bike computers. In this study, 30 participants were tested with eight hazard perception tasks while they maintained a cadence of 60 ± 5 RPM and used bike computers with different sensory displays, namely visual, auditory, and tactile feedback signals...
March 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/27889770/usefulness-of-discriminability-and-response-bias-indices-for-the-evaluation-of-recognition-memory-in-mild-cognitive-impairment-and-alzheimer-disease
#6
María Julieta Russo, Gabriela Cohen, Jorge Campos, Maria Eugenia Martin, María Florencia Clarens, Liliana Sabe, Ernesto Barcelo, Ricardo F Allegri
BACKGROUND: Most studies examining episodic memory in Alzheimer disease (AD) have focused on patients' impaired ability to remember information. This approach provides only a partial picture of memory deficits since other factors involved are not considered. OBJECTIVE: To evaluate the recognition memory performance by using a yes/no procedure to examine the effect of discriminability and response bias measures in amnestic mild cognitive impairment (a-MCI), AD dementia, and normal-aging subjects...
November 26, 2016: Dementia and Geriatric Cognitive Disorders
https://www.readbyqxmd.com/read/27883233/intranasal-insulin-boosts-gustatory-sensitivity
#7
Rea Rodriguez-Raecke, Huan Yang, Yvonne F Brünner, Jessica Freiherr
Intranasal insulin had been in the spotlight not only for enhancing memory processes but also for its anorexic effects, as well as its effects on olfactory sensitivity. Here, the influence of intranasal insulin on gustatory sensitivity was investigated using intranasal applications of insulin or placebo in a double-blind manner alongside a control condition without any application. We hypothesized that intranasal insulin, as it mediates satiety, alters gustatory sensitivity whereas placebo application and control should not alter gustatory sensitivity...
November 24, 2016: Journal of Neuroendocrinology
https://www.readbyqxmd.com/read/27865432/a-hybrid-fault-diagnosis-approach-based-on-mixed-domain-state-features-for-rotating-machinery
#8
Xiaoming Xue, Jianzhong Zhou
To make further improvement in the diagnosis accuracy and efficiency, a mixed-domain state features data based hybrid fault diagnosis approach, which systematically blends both the statistical analysis approach and the artificial intelligence technology, is proposed in this work for rolling element bearings. For simplifying the fault diagnosis problems, the execution of the proposed method is divided into three steps, i.e., fault preliminary detection, fault type recognition and fault degree identification...
November 16, 2016: ISA Transactions
https://www.readbyqxmd.com/read/27835671/an-anti-parkinson-s-disease-drug-via-targeting-adenosine-a2a-receptor-enhances-amyloid-%C3%AE-generation-and-%C3%AE-secretase-activity
#9
Jing Lu, Jin Cui, Xiaohang Li, Xin Wang, Yue Zhou, Wenjuan Yang, Ming Chen, Jian Zhao, Gang Pei
γ-secretase mediates the intramembranous proteolysis of amyloid precursor protein (APP) and determines the generation of Aβ which is associated with Alzheimer's disease (AD). Here we identified that an anti-Parkinson's disease drug, Istradefylline, could enhance Aβ generation in various cell lines and primary neuronal cells of APP/PS1 mouse. Moreover, the increased generation of Aβ42 was detected in the cortex of APP/PS1 mouse after chronic treatment with Istradefylline. Istradefylline promoted the activity of γ-secretase which could lead to increased Aβ production...
2016: PloS One
https://www.readbyqxmd.com/read/27828031/characteristic-properties-of-the-spatial-correlations-and-visibility-in-mixed-light-ghost-imaging
#10
Sébastien Hartmann, Simone Kuhn, Wolfgang Elsässer
Recently, we developed a new ghost imaging (GI) detection concept based on the superposition of object and reference beams with subsequent photon statistics evaluation by using one single photon counting detector (PS-GI). Here, we derive analytical expressions for the spatial correlations of this mixed light GI concept considering the mode properties of the speckles of an illuminating classical pseudothermal source. This model supports the first experimental results of PS-GI in [Opt. Lett.41, 2863-2866 (2016)OPLEDP0146-959210...
October 1, 2016: Applied Optics
https://www.readbyqxmd.com/read/27826267/social-pre-treatment-modulates-attention-allocation-to-transient-and-stable-object-properties
#11
Katalin Oláh, Fruzsina Elekes, Borbála Turcsán, Orsolya Kis, József Topál
Increasing evidence suggests that ostensive-communicative signals in social learning situations enable observers to focus their attention on the intrinsic features of an object (e.g., color) at the expense of ignoring transient object properties (e.g., location). Here we investigated whether off-line social cues, presented as social primes, have the same power to modulate attention allocation to stable and transient object properties as on-line ostensive-communicative cues. The first part of the experiment consisted of a pre-treatment phase, where adult male participants either received intensive social stimulation or were asked to perform non-social actions...
2016: Frontiers in Psychology
https://www.readbyqxmd.com/read/27824576/concentration-encoded-subdiffusive-molecular-communication-theory-channel-characteristics-and-optimum-signal-detection
#12
Mohammad Upal Mahfuz, Dimitrios Makrakis, Hussein T Mouftah
Unlike normal diffusion, in anomalous diffusion, the movement of a molecule is described by the correlated random walk model where the mean square displacement of a molecule depends on the power law of time. In molecular communication (MC), there are many scenarios when the propagation of molecules cannot be described by normal diffusion process, where anomalous diffusion is a better fit. In this paper, the effects of anomalous subdiffusion on concentration-encoded molecular communication (CEMC) are investigated...
September 2016: IEEE Transactions on Nanobioscience
https://www.readbyqxmd.com/read/27819451/visual-perceptual-load-reduces-auditory-detection-in-typically-developing-individuals-but-not-in-individuals-with-autism-spectrum-disorders
#13
Julian Tillmann, John Swettenham
Objective: Previous studies examining selective attention in individuals with autism spectrum disorder (ASD) have yielded conflicting results, some suggesting superior focused attention (e.g., on visual search tasks), others demonstrating greater distractibility. This pattern could be accounted for by the proposal (derived by applying the Load theory of attention, e.g., Lavie, 2005) that ASD is characterized by an increased perceptual capacity (Remington, Swettenham, Campbell, & Coleman, 2009). Recent studies in the visual domain support this proposal...
November 7, 2016: Neuropsychology
https://www.readbyqxmd.com/read/27816597/feasibility-in-the-development-of-a-multi-marker-detection-platform
#14
Chi Lin, Lindsey Ryder, David Probst, Michael Caplan, Mark Spano, Jeffrey LaBelle
A feasibility study for a label-free, multi-marker single sensor using electrochemical impedance spectroscopy (EIS), imaginary impedance, and a signal decoupling technique is reported. To our knowledge, this is the first reported attempt of using imaginary impedance for biomarker detection and multi-marker detection. The electrochemical responses of purified low and high density lipoproteins (LDL and HDL, respectively) were first individually characterized through the immobilization of their molecular recognition elements (MREs) onto gold disk electrodes (GDEs)...
October 27, 2016: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/27802032/uncovering-the-role-of-oxygen-atom-transfer-in-ru-based-catalytic-water-oxidation
#15
Dooshaye Moonshiram, Yuliana Pineda-Galvan, Darren Erdman, Mark C Palenik, Ruifa Zong, Randolph P Thummel, Yulia N Pushkar
The realization of artificial photosynthesis carries the promise of cheap and abundant energy, however, significant advances in the rational design of water oxidation catalysts are required. Detailed information on the structure of the catalyst under reaction conditions and mechanisms of O-O bond formation should be obtained. Here, we used a combination of Electron Paramagnetic Resonance (EPR), stopped flow freeze quench on a millisecond-second time scale, X-ray absorption (XAS), Resonance Raman (RR) spectroscopy and Density Functional Theory (DFT) to follow the dynamics of the Ru-based single site catalyst, [Ru(II)(NPM)(4-pic)2(H2O)](2+) (NPM = 4-t-butyl-2,6-di(1',8'-naphthyrid-2'-yl)pyridine, pic = 4-picoline), under the water oxidation conditions...
November 1, 2016: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/27799655/balancing-selection-shapes-density-dependent-foraging-behaviour
#16
Joshua S Greene, Maximillian Brown, May Dobosiewicz, Itzel G Ishida, Evan Z Macosko, Xinxing Zhang, Rebecca A Butcher, Devin J Cline, Patrick T McGrath, Cornelia I Bargmann
The optimal foraging strategy in a given environment depends on the number of competing individuals and their behavioural strategies. Little is known about the genes and neural circuits that integrate social information into foraging decisions. Here we show that ascaroside pheromones, small glycolipids that signal population density, suppress exploratory foraging in Caenorhabditis elegans, and that heritable variation in this behaviour generates alternative foraging strategies. We find that natural C. elegans isolates differ in their sensitivity to the potent ascaroside icas#9 (IC-asc-C5)...
October 31, 2016: Nature
https://www.readbyqxmd.com/read/27798189/a-decline-in-response-variability-improves-neural-signal-detection-during-auditory-task-performance
#17
Gardiner von Trapp, Bradley N Buran, Kamal Sen, Malcolm N Semple, Dan H Sanes
: The detection of a sensory stimulus arises from a significant change in neural activity, but a sensory neuron's response is rarely identical to successive presentations of the same stimulus. Large trial-to-trial variability would limit the central nervous system's ability to reliably detect a stimulus, presumably affecting perceptual performance. However, if response variability were to decrease while firing rate remained constant, then neural sensitivity could improve. Here, we asked whether engagement in an auditory detection task can modulate response variability, thereby increasing neural sensitivity...
October 26, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/27776562/clinical-anxiety-promotes-excessive-response-inhibition
#18
C Grillon, O J Robinson, K O'Connell, A Davis, G Alvarez, D S Pine, M Ernst
BACKGROUND: Laboratory tasks to delineate anxiety disorder features are used to refine classification and inform our understanding of etiological mechanisms. The present study examines laboratory measures of response inhibition, specifically the inhibition of a pre-potent motor response, in clinical anxiety. Data on associations between anxiety and response inhibition remain inconsistent, perhaps because of dissociable effects of clinical anxiety and experimentally manipulated state anxiety...
October 25, 2016: Psychological Medicine
https://www.readbyqxmd.com/read/27775373/modelling-random-antibody-adsorption-and-immunoassay-activity
#19
D Mackey, E Kelly, R Nooney
One of the primary considerations in immunoassay design is optimizing the concentration of capture antibody in order to achieve maximal antigen binding and, subsequently, improved sensitivity and limit of detection. Many immunoassay technologies involve immobilization of the antibody to solid surfaces. Antibodies are large molecules in which the position and accessibility of the antigen-binding site depend on their orientation and packing density. In this paper we propose a simple mathematical model, based on the theory known as random sequential adsorption (RSA), in order to calculate how the concentration of correctly oriented antibodies (active site exposed for subsequent reactions) evolves during the deposition process...
December 1, 2016: Mathematical Biosciences and Engineering: MBE
https://www.readbyqxmd.com/read/27756476/sedimentation-field-flow-fractionation-and-optical-absorption-spectroscopy-for-a-quantitative-size-characterization-of-silver-nanoparticles
#20
Catia Contado, Roberto Argazzi, Vincenzo Amendola
Many advanced industrial and biomedical applications that use silver nanoparticles (AgNPs), require that particles are not only nano-sized, but also well dispersed, not aggregated and not agglomerated. This study presents two methods able to give rapidly sizes of monodispersed AgNPs suspensions in the dimensional range of 20-100nm. The first method, based on the application of Mie's theory, determines the particle sizes from the values of the surface plasmon resonance wavelength (SPRMAX), read from the optical absorption spectra, recorded between 190nm and 800nm...
October 13, 2016: Journal of Chromatography. A
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