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https://www.readbyqxmd.com/read/28227697/simultaneous-evaluation-of-prepulse-inhibition-with-emg-and-eeg-using-advanced-artifact-removal-techniques
#1
Francisco J Fraga, Claudemiro V Noya, Maria I Zimiani, Milton A Avila, Rosana Shuhama, Cristina M Del-Ben, Paulo R Menezes, Rodrigo S Martin, Cristiane Salum, Francisco J Fraga, Claudemiro V Noya, Maria I Zimiani, Milton A Avila, Rosana Shuhama, Cristina M Del-Ben, Paulo R Menezes, Rodrigo S Martin, Cristiane Salum, Francisco J Fraga, Paulo R Menezes, Claudemiro V Noya, Rosana Shuhama, Milton A Avila, Cristina M Del-Ben, Cristiane Salum, Rodrigo S Martin, Maria I Zimiani
Prepulse inhibition (PPI) consists of a reduction of the acoustic startle reflex (SR) magnitude (measured with EMG) when a startling stimulus is preceded by a non-startling one. This behavior has been extensively investigated in studies related to schizophrenia, since sensory-motor deficit plays a central role in its pathophysiology. However, the same auditory stimuli that trigger the SR also provoke intense auditory evoked responses (AEP), which can be measured with EEG. Comparing these two types of responses, acquired simultaneously, is a great opportunity to investigate the dependence and interdependence of their neural pathways...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227579/implementation-of-a-control-system-for-a-power-wheelchair-with-induction-of-a-%C3%AE-%C3%AE-ratio-by-visual-feedback
#2
Yudai Iida, Ryota Horie, Yudai Iida, Ryota Horie, Ryota Horie, Yudai Iida
Techniques using electroencephalography (EEG)-based brain computer interfaces (BCIs) have been developed and are eagerly anticipated as novel interfaces for controlling power wheelchairs. In addition to the BCIs, smart glass technology has been developed. In our previous study, we propose a prototype of an intuitive control system for a power wheelchair; this system comprises a simple EEG recorder, smart glass, and a microcomputer. Using this system, the power wheelchair moves straight ahead when a user concentrates, stops when the user blinks, and turns left or right when the user tilt his/her neck to the left or right, respectively...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227195/a-new-regression-based-method-for-the-eye-blinks-artifacts-correction-in-the-eeg-signal-without-using-any-eog-channel
#3
Gianluca Di Flumeri, Pietro Arico, Gianluca Borghini, Alfredo Colosimo, Fabio Babiloni, Gianluca Di Flumeri, Pietro Arico, Gianluca Borghini, Alfredo Colosimo, Fabio Babiloni, Gianluca Di Flumeri, Gianluca Borghini, Pietro Arico, Fabio Babiloni, Alfredo Colosimo
Eye blinks artifacts correction in the EEG signal is a best practice in many applications. Nowadays, different approaches can be used to overcome such an issue: the most used methods are based on regression techniques and Independent Component Analysis. It is not clear which is the best performing method, thus the choice of which method to adopt depends on the specific application, on the basis of the method limitations. In fact, on one hand the regression-based methods require at least one EOG channel, and are affected by the mutual contamination between EEG and EOG signals...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226928/fatigue-evaluation-using-a-glass-shape-optical-sensors-system
#4
Ryogo Horiuchi, Norihisa Miki, Ryogo Horiuchi, Norihisa Miki, Norihisa Miki, Ryogo Horiuchi
The demand for measurements of mental stress and fatigue, which leads to low efficacy, illness, and sometimes tragic accidents, is rising up in recent years. However, detection and quantification of change in one's wakefulness which trigger mental stress and fatigue remains to be elucidated. In this paper, we focus on physiological signals showing up on one's eyelid to detect change in one's wakefulness. Using our micro-fabricated eyeglass-shape optical sensor system, we successfully found several eyelid movements which have strong correlation with one's wakefulness...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226834/a-survey-on-the-feasibility-of-surface-emg-in-facial-pacing
#5
Ville Rantanen, Mirja Ilves, Antti Vehkaoja, Anton Kontunen, Jani Lylykangas, Eeva Makela, Markus Rautiainen, Veikko Surakka, Jukka Lekkala, Ville Rantanen, Mirja Ilves, Antti Vehkaoja, Anton Kontunen, Jani Lylykangas, Eeva Makela, Markus Rautiainen, Veikko Surakka, Jukka Lekkala, Veikko Surakka, Jukka Lekkala, Mirja Ilves, Markus Rautiainen, Anton Kontunen, Antti Vehkaoja, Jani Lylykangas, Ville Rantanen, Eeva Makela
A survey on the feasibility of surface electromyography (EMG) measurements in facial pacing is presented. Pacing for unilateral facial paralysis consists of the measurement of activity from the healthy side of the face and functional electrical stimulation to reanimate the paralyzed one. The goal of this study is to evaluate the feasibility of surface EMG as a measurement method to detect muscle activations and to determine their intensities. Prior work is discussed, and results from experiments where 12 participants carried out a set of facial movements are presented...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28223699/fluorescence-intermittency-originates-from-reclustering-in-two-dimensional-organic-semiconductors
#6
Anthony Ruth, Michitoshi Hayashi, Peter Zapol, Jixin Si, Matthew P McDonald, Yurii V Morozov, Masaru Kuno, Boldizsár Jankó
Fluorescence intermittency or blinking is observed in nearly all nanoscale fluorophores. It is characterized by universal power-law distributions in on- and off-times as well as 1/f behaviour in corresponding emission power spectral densities. Blinking, previously seen in confined zero- and one-dimensional systems has recently been documented in two-dimensional reduced graphene oxide. Here we show that unexpected blinking during graphene oxide-to-reduced graphene oxide photoreduction is attributed, in large part, to the redistribution of carbon sp(2) domains...
February 22, 2017: Nature Communications
https://www.readbyqxmd.com/read/28221804/semiconductor-seeded-nanorods-with-graded-composition-exhibiting-high-quantum-yield-high-polarization-and-minimal-blinking
#7
Ido Hadar, John Patrick Philbin, Yossef Efraim Panfil, Shany Neyshtadt, Itai Lieberman, Hagai Eshet, Sorin Lazar, Eran Rabani, Uri Banin
Seeded semiconductor nanorods represent a unique family of quantum confined materials that manifest characteristics of mixed dimensionality. They show polarized emission with high quantum yield and fluorescence switching under an electric field, features that are desirable for use in display technologies and other optical applications. So far, their robust synthesis has been limited mainly to CdSe/CdS heterostructures, thereby constraining the spectral tunability to the red region of the visible spectrum. Herein we present a novel synthesis of CdSe/Cd1-xZnxS seeded nanorods with radially graded composition that show bright and highly polarized green emission with minimal intermittency, as confirmed by ensemble and single nanorods optical measurements...
February 21, 2017: Nano Letters
https://www.readbyqxmd.com/read/28221750/shell-dependent-photoluminescence-studies-provide-mechanistic-insights-into-the-off-grey-on-transitions-of-blinking-quantum-dots
#8
Feng Gao, Pooja Bajwa, Anh Nguyen, Colin D Heyes
The majority of quantum dot (QD) blinking studies have used a model of switching between two distinct fluorescence intensity levels, "on" and "off". However, a distinct intermediate intensity level has been identified in some recent reports - a so-called "grey" or "dim" state, which has brought this binary model into question. While this grey state has been proposed to result from the formation of a trion, it is still unclear under which conditions it is present in a QD. By performing shell-dependent blinking studies on CdSe QDs, we report that the populations of the grey state and the on state are strongly dependent on both the shell material and its thickness...
February 21, 2017: ACS Nano
https://www.readbyqxmd.com/read/28220882/eyeblink-rate-watching-classical-hollywood-and-post-classical-mtv-editing-styles-in-media-and-non-media-professionals
#9
Celia Andreu-Sánchez, Miguel Ángel Martín-Pascual, Agnès Gruart, José María Delgado-García
While movie edition creates a discontinuity in audio-visual works for narrative and economy-of-storytelling reasons, eyeblink creates a discontinuity in visual perception for protective and cognitive reasons. We were interested in analyzing eyeblink rate linked to cinematographic edition styles. We created three video stimuli with different editing styles and analyzed spontaneous blink rate in participants (N = 40). We were also interested in looking for different perceptive patterns in blink rate related to media professionalization...
February 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28219681/the-developmental-relationship-between-central-dopaminergic-level-and-response-inhibition-from-late-childhood-to-young-adulthood
#10
Ting Zhang, Qin Zhang, Cuicui Wang, Antao Chen
Dopamine (DA) is known to modulate response inhibition (RI). In contrast to the abundant adult studies, only few developmental studies have focused on this topic. Moreover, the mechanism underlying the modulation of RI by the DA system from childhood to adulthood remains unclear. We aimed to assess whether the relationship between DA and RI during late childhood and young adulthood is similar. Accordingly, DA function was measured using the spontaneous eye blink rate (EBR), whereas RI ability was tested using the Go/Nogo task...
February 17, 2017: International Journal of Psychophysiology
https://www.readbyqxmd.com/read/28217081/blinker-automated-extraction-of-ocular-indices-from-eeg-enabling-large-scale-analysis
#11
Kelly Kleifges, Nima Bigdely-Shamlo, Scott E Kerick, Kay A Robbins
Electroencephalography (EEG) offers a platform for studying the relationships between behavioral measures, such as blink rate and duration, with neural correlates of fatigue and attention, such as theta and alpha band power. Further, the existence of EEG studies covering a variety of subjects and tasks provides opportunities for the community to better characterize variability of these measures across tasks and subjects. We have implemented an automated pipeline (BLINKER) for extracting ocular indices such as blink rate, blink duration, and blink velocity-amplitude ratios from EEG channels, EOG channels, and/or independent components (ICs)...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28204865/prediction-of-human-sensory-irritation-due-to-ethyl-acrylate-the-appropriateness-of-time-weighted-average-concentration%C3%A2-%C3%A3-%C3%A2-time-models-for-varying-concentrations
#12
Stefan Kleinbeck, Michael Schäper, Anna Zimmermann, Meinolf Blaszkewicz, Thomas Brüning, Christoph van Thriel
Human data about the potency of ethyl acrylate to evoke sensory irritation is currently not available. Therefore, we conducted an experimental exposure study and the magnitude of chemosensory effects in healthy human volunteers was mathematically modeled by combining the factors current concentration (c) and duration/time (t). In a repeated-measures design, 19 subjects were exposed for 4 h to constant and varying concentrations (including peaks of 5 and 10 ppm) of ethyl acrylate with either a 2.5 or 5 ppm time-weighted average (TWA) concentration...
February 15, 2017: Archives of Toxicology
https://www.readbyqxmd.com/read/28202571/temporal-dynamics-of-retinal-and-extraretinal-signals-in-the-fefsem-during-smooth-pursuit-eye-movements
#13
Leah Bakst, Jerome Fleuriet, Michael J Mustari
Neurons in the smooth eye movement subregion of the Frontal Eye Field (FEFsem) are known to play an important role in voluntary smooth pursuit eye movements. Underlying this function are projections to parietal and prefrontal visual association areas and subcortical structures, all known to play vital, but differing roles in the execution of smooth pursuit. Additionally, the FEFsem has been shown to carry a diverse array of signals (e.g. eye velocity, acceleration, gain control). We hypothesized that distinct subpopulations of FEFsem neurons subserve these diverse functions and projections, and that the relative weights of retinal and extraretinal signals could form the basis for categorization of units...
February 15, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28196307/molecule-counts-in-localization-microscopy-with-organic-fluorophores
#14
Mike Heilemann, Franziska Fricke, Christos Karathanasis, Gerhard Hummer
Single-molecule localization microscopy (SMLM) can be used to count fluorescently labeled molecules even when they are not individually resolved. We demonstrate SMLM molecule counting for nucleic acids labeled with the organic fluorophore Alexa Fluor 647 and imaged under photoswitching conditions. From the observed distributions of the number of fluorophore blinking events, we extracted the number of fluorophores per spot using a statistical model. We validate the molecule counting method for single Alexa Fluor 647 fluorophores, and for trimers of Alexa Fluor 647 constructed on a DNA origami structure...
February 14, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28195522/source-localization-of-brain-states-associated-with-canonical-neuroimaging-postures
#15
Michael Lifshitz, Robert T Thibault, Raquel R Roth, Amir Raz
Cognitive neuroscientists rarely consider the influence that body position exerts on brain activity; yet, postural variation holds important implications for the acquisition and interpretation of neuroimaging data. Whereas participants in most behavioral and EEG experiments sit upright, many prominent brain imaging techniques (e.g., fMRI) require participants to lie supine. Here we demonstrate that physical comportment profoundly alters baseline brain activity as measured by magnetoencephalography (MEG)-an imaging modality that permits multipostural acquisition...
February 14, 2017: Journal of Cognitive Neuroscience
https://www.readbyqxmd.com/read/28194221/a-removal-of-eye-movement-and-blink-artifacts-from-eeg-data-using-morphological-component-analysis
#16
Balbir Singh, Hiroaki Wagatsuma
EEG signals contain a large amount of ocular artifacts with different time-frequency properties mixing together in EEGs of interest. The artifact removal has been substantially dealt with by existing decomposition methods known as PCA and ICA based on the orthogonality of signal vectors or statistical independence of signal components. We focused on the signal morphology and proposed a systematic decomposition method to identify the type of signal components on the basis of sparsity in the time-frequency domain based on Morphological Component Analysis (MCA), which provides a way of reconstruction that guarantees accuracy in reconstruction by using multiple bases in accordance with the concept of "dictionary...
2017: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/28191974/single-molecule-fluorescence-spectroscopy-of-perylene-diimide-dyes-in-a-%C3%AE-cyclodextrin-film-manifestation-of-photoinduced-h-atom-transfer-via-higher-triplet-n-%C3%AF-excited-states
#17
Masaaki Mitsui, Hiroki Fukui, Ryoya Takahashi, Yasushi Takakura, Toshinari Mizukami
Supramolecular complexation of γ-cyclodextrin (γ-CD) with N,N'-bis(2,6-dimethylphenyl)perylene-3,4,9,10-tetracarboxylic diimide (DMP-PDI) or N,N'-bis(2,6-dioctyl)perylene-3,4,9,10-tetracarboxylic diimide (C8-PDI) dye in an aqueous solution and in a γ-CD solid film were investigated via ensemble and single-molecule fluorescence spectroscopy. These two perylene diimide derivatives possess almost the same electronic structure but have different terminal functional groups. This structural difference leads to formation of an inclusion complex of γ-CD with DMP-PDI but not with C8-PDI in aqueous solution...
February 13, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28191627/evaluating-the-efficacy-of-fully-automated-approaches-for-the-selection-of-eyeblink-ica-components
#18
Matthew B Pontifex, Vladimir Miskovic, Sarah Laszlo
Independent component analysis (ICA) offers a powerful approach for the isolation and removal of eyeblink artifacts from EEG signals. Manual identification of the eyeblink ICA component by inspection of scalp map projections, however, is prone to error, particularly when nonartifactual components exhibit topographic distributions similar to the blink. The aim of the present investigation was to determine the extent to which automated approaches for selecting eyeblink-related ICA components could be utilized to replace manual selection...
February 13, 2017: Psychophysiology
https://www.readbyqxmd.com/read/28178297/the-flashlight-fish-anomalops-katoptron-uses-bioluminescent-light-to-detect-prey-in-the-dark
#19
Jens Hellinger, Peter Jägers, Marcel Donner, Franziska Sutt, Melanie D Mark, Budiono Senen, Ralph Tollrian, Stefan Herlitze
Bioluminescence is a fascinating phenomenon occurring in numerous animal taxa in the ocean. The reef dwelling splitfin flashlight fish (Anomalops katoptron) can be found in large schools during moonless nights in the shallow water of coral reefs and in the open surrounding water. Anomalops katoptron produce striking blink patterns with symbiotic bacteria in their sub-ocular light organs. We examined the blink frequency in A. katoptron under various laboratory conditions. During the night A. katoptron swims in schools roughly parallel to their conspecifics and display high blink frequencies of approximately 90 blinks/minute with equal on and off times...
2017: PloS One
https://www.readbyqxmd.com/read/28176871/the-earliest-molecular-response-to-stretch-of-insect-flight-muscle-as-revealed-by-fast-x-ray-diffraction-recording
#20
Hiroyuki Iwamoto
Small insects drive their flight muscle at frequencies up to 1,000 Hz. This remarkable ability owes to the mechanism of stretch activation. However, it remains unknown as to what sarcomeric component senses the stretch and triggers the following force generation. Here we show that the earliest structural change after a step stretch is reflected in the blinking of the 111 and 201 reflections, as observed in the fast X-ray diffraction recording from isolated bumblebee flight muscle fibers. The same signal has also been observed in live bumblebee...
February 8, 2017: Scientific Reports
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