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https://www.readbyqxmd.com/read/28545123/predictability-of-arousal-in-mouse-slow-wave-sleep-by-accelerometer-data
#1
Gustavo Zampier Dos Santos Lima, Sergio Roberto Lopes, Thiago Lima Prado, Bruno Lobao-Soares, George C do Nascimento, John Fontenele-Araujo, Gilberto Corso
Arousals can be roughly characterized by punctual intrusions of wakefulness into sleep. In a standard perspective, using human electroencephalography (EEG) data, arousals are associated to slow-wave rhythms and K-complex brain activity. The physiological mechanisms that give rise to arousals during sleep are not yet fully understood. Moreover, subtle body movement patterns, which may characterize arousals both in human and in animals, are usually not detectable by eye perception and are not in general present in sleep studies...
2017: PloS One
https://www.readbyqxmd.com/read/28542191/spontaneous-cortical-activity-is-transiently-poised-close-to-criticality
#2
Gerald Hahn, Adrian Ponce-Alvarez, Cyril Monier, Giacomo Benvenuti, Arvind Kumar, Frédéric Chavane, Gustavo Deco, Yves Frégnac
Brain activity displays a large repertoire of dynamics across the sleep-wake cycle and even during anesthesia. It was suggested that criticality could serve as a unifying principle underlying the diversity of dynamics. This view has been supported by the observation of spontaneous bursts of cortical activity with scale-invariant sizes and durations, known as neuronal avalanches, in recordings of mesoscopic cortical signals. However, the existence of neuronal avalanches in spiking activity has been equivocal with studies reporting both its presence and absence...
May 24, 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28536507/dopamine-modulates-delta-gamma-phase-amplitude-coupling-in-the-prefrontal-cortex-of-behaving-rats
#3
Victoria Andino-Pavlovsky, Annie C Souza, Robson Scheffer-Teixeira, Adriano B L Tort, Roberto Etchenique, Sidarta Ribeiro
Dopamine release and phase-amplitude cross-frequency coupling (CFC) have independently been implicated in prefrontal cortex (PFC) functioning. To causally investigate whether dopamine release affects phase-amplitude comodulation between different frequencies in local field potentials (LFP) recorded from the medial PFC (mPFC) of behaving rats, we used RuBiDopa, a light-sensitive caged compound that releases the neurotransmitter dopamine when irradiated with visible light. LFP power did not change in any frequency band after the application of light-uncaged dopamine, but significantly strengthened phase-amplitude comodulation between delta and gamma oscillations...
2017: Frontiers in Neural Circuits
https://www.readbyqxmd.com/read/28536269/a-cognition-related-neural-oscillation-pattern-generated-in-the-prelimbic-cortex-can-control-operant-learning-in-rats
#4
Samuel Hernández-González, Celia Andreu-Sánchez, Miguel Ángel Martín-Pascual, Agnès Gruart, José María Delgado-García
The prelimbic (PrL) cortex constitutes one of the highest levels of cortical hierarchy dedicated to the execution of adaptive behaviors. We have identified a specific local field potential (LFP) pattern generated in the PrL cortex, associated with cognition-related behaviors, and used it to trigger the activation of a visual display on a touch screen as part of an operant conditioning task. Rats learned to increase the presentation rate of the selected theta/beta-gamma transition pattern across training sessions...
May 23, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28534631/photochemical-formation-of-anthracene-quinone-methide-derivatives
#5
Djani Skalamera, Kata Mlinarić-Majerski, Irena Martin Kleiner, Marijeta Kralj, Jessy Oake, Peter Wan, Cornelia Bohne, Nikola Basaric
Anthrols 2-7 were synthesized and their photochemical reactivity investigated by irradiations in aq. CH3OH. Upon excitation with visible light (λ > 400 nm) in methanolic solutions they undergo photodehydration or photodeamination and deliver methyl ethers, most probably via quinone methides (QMs), with methanolysis quantum efficiencies ΦR = 0.02-0.3. Photophysical properties of 2-7 were determined by steady-state fluorescence and time-correlated single photon counting. Generally, anthrols 2-7 are highly fluorescent in aprotic solvents (ΦF = 0...
May 23, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28532653/hippocampal-ca1-local-field-potential-oscillations-induced-by-olfactory-cue-of-liked-food
#6
Nifareeda Samerphob, Dania Cheaha, Surapong Chatpun, Ekkasit Kumarnsit
Eating motivation is induced not only by negative energy balance but also food related cues. However, neural processing for acquisition of learned food preference remains to be established. This study aimed to identify hippocampal neural signaling in response to olfactory cue (chocolate scent) after completion of repetitive chocolate sessions. Male Swiss albino mice implanted with intracranial electrode into the hippocampus were used for local field potential (LFP) recording. Animals were given chocolate sessions (a piece of 2 g chocolate per each mouse to eat on day 1, 3, 5 and 7)...
May 19, 2017: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/28529731/a-bayesian-supervised-dual-dimensionality-reduction-model-for-simultaneous-decoding-of-lfp-and-spike-train-signals
#7
Andrew Holbrook, Alexander Vandenberg-Rodes, Norbert Fortin, Babak Shahbaba
Neuroscientists are increasingly collecting multimodal data during experiments and observational studies. Different data modalities-such as EEG, fMRI, LFP, and spike trains-offer different views of the complex systems contributing to neural phenomena. Here, we focus on joint modeling of LFP and spike train data, and present a novel Bayesian method for neural decoding to infer behavioral and experimental conditions. This model performs supervised dual-dimensionality reduction: it learns low-dimensional representations of two different sources of information that not only explain variation in the input data itself, but also predict extra-neuronal outcomes...
2017: Stat: the ISI's Journal for Rapid Dissemination of Statistics Research
https://www.readbyqxmd.com/read/28504196/human-subthalamic-nucleus-automatic-auditory-change-detection-as-a-basis-for-action-selection
#8
Marcus Heldmann, Thomas F Münte, Lejla Paracka, Frederike Beyer, Norbert Brüggemann, Assel Saryyeva, Dirk Rasche, Joachim K Krauss, Volker M Tronnier
The subthalamic nucleus (STN) shapes motor behavior and is important for the initiation and termination of movements. Here we ask whether the STN takes aggregated sensory information into account, in order to exert this function. To this end, local field potentials (LFP) were recorded in eight patients suffering from Parkinson's disease and receiving deep-brain stimulation of the STN bilaterally. Bipolar recordings were obtained postoperatively from the externalized electrode leads. Patients were passively exposed to trains of auditory stimuli containing global deviants, local deviants or combined global/local deviants...
May 11, 2017: Neuroscience
https://www.readbyqxmd.com/read/28493348/effect-of-eye-opening-on-single-unit-activity-and-local-field-potentials-in-the-subthalamic-nucleus
#9
Arun Chockalingam, Abigail Belasen, Nita Chen, Adolfo Ramirez-Zamora, Youngwon Youn, Paul Feustel, Meghan E Wilock, Damian S Shin, Julie G Pilitsis
BACKGROUND: Subthalamic nucleus deep brain stimulation (STN DBS) is an established treatment in Parkinson's disease (PD). We investigate the effect of eye opening on neuronal activity and local field potentials (LFPs) in the STN. METHODS: We prospectively enrolled 25 PD patients undergoing STN DBS in our institution. During DBS, single-unit activity (SUA) and LFPs were measured when eyes were open and closed. As movement is known to result in changes in LFPs, we tested response to eye opening in the presence and absence of movement...
May 10, 2017: Neuromodulation: Journal of the International Neuromodulation Society
https://www.readbyqxmd.com/read/28480502/enriched-environment-attenuates-behavioral-seizures%C3%A2-and-depression-in-chronic%C3%A2-temporal-lobe-epilepsy
#10
Marigowda Vrinda, Arun Sasidharan, Sahajan Aparna, Bettadapura N Srikumar, Bindu M Kutty, Byrathnahalli S Shankaranarayana Rao
OBJECTIVE: Temporal lobe epilepsy (TLE) is commonly associated with depression, anxiety, and cognitive impairment. Despite significant progress in our understanding of the pathophysiology of TLE, it remains the most common form of refractory epilepsy. Enriched environment (EE) has a beneficial effect in many neuropsychiatric disorders. However, the effect of EE on cognitive changes in chronic TLE has not been evaluated. Accordingly, the present study evaluated the effects of EE on chronic epilepsy-induced alterations in cognitive functions, electrophysiology, and cellular changes in the hippocampus...
May 8, 2017: Epilepsia
https://www.readbyqxmd.com/read/28479402/tight-neurovascular-coupling-in-the-spinal-cord-during-nociceptive-stimulation-in-intact-and-spinal-rats
#11
Mathieu Piché, Thierry Paquette, Hugues Leblond
Functional magnetic resonance imaging (fMRI) is based on neurovascular coupling, which allows inferring neuronal activity from hemodynamic changes. Spinal fMRI has been used to examine pain processes, although spinal neurovascular coupling has never been investigated. In addition, fluctuations in mean arterial pressure (MAP) occur during nociceptive stimulation and this may affect neurovascular coupling. The objective of this study was to examine neurovascular coupling in the rat spinal cord during nociceptive stimulation while MAP was manipulated by cervical spinal transection, which prevents nociception-related MAP increases...
May 4, 2017: Neuroscience
https://www.readbyqxmd.com/read/28469479/audiovisual-distraction-increases-prefrontal-cortical-neuronal-activity-and-impairs-attentional-performance-in-the-rat
#12
Douglas G Ririe, M Danilo Boada, Benjamin S Schmidt, Salem J Martin, Susy A Kim, Thomas J Martin
Involvement of attentional processes is generally evidenced by disruption of behavior in the presence of distracting stimuli. The medial prefrontal cortex (mPFC) seems to play a role in fine-tuning activity during attentional tasks. A novel titration variant of the 5-choice serial reaction time task (5-choice serial reaction time titration variant [5CTV]) that adjusts task difficulty based on subject performance was used to evaluate the effects of audiovisual distraction (DSTR) on performance and mPFC single spike activity and local field potential (LFP)...
2017: Journal of Experimental Neuroscience
https://www.readbyqxmd.com/read/28461461/high-spatial-correspondence-at-a-columnar-level-between-activation-and-resting-state-fmri-signals-and-local-field-potentials
#13
Zhaoyue Shi, Ruiqi Wu, Pai-Feng Yang, Feng Wang, Tung-Lin Wu, Arabinda Mishra, Li Min Chen, John C Gore
Although blood oxygenation level-dependent (BOLD) fMRI has been widely used to map brain responses to external stimuli and to delineate functional circuits at rest, the extent to which BOLD signals correlate spatially with underlying neuronal activity, the spatial relationships between stimulus-evoked BOLD activations and local correlations of BOLD signals in a resting state, and whether these spatial relationships vary across functionally distinct cortical areas are not known. To address these critical questions, we directly compared the spatial extents of stimulated activations and the local profiles of intervoxel resting state correlations for both high-resolution BOLD at 9...
May 1, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28452638/when-employment-and-caregiving-collide-predictors-of-labor-force-participation-in-prospective-and-current-caregivers
#14
Daniel Paulson, Rachel Bassett, Emily Kitsmiller, Kandace Luther, Norma Conner
OBJECTIVE: Female caregivers often reduce time spent at work to care for aging family members, which precipitates financial hardship and other adverse outcomes. Little is known about psychosocial correlates of labor force participation (LFP) among female caregivers. The theory of planned behavior posits that social norms, attitudes, and perceived control predict intentions and volitional behaviors, but also that the compelling influence of situational variables undermines enactment of behaviors consistent with one's intentions...
June 7, 2016: Clinical Gerontologist
https://www.readbyqxmd.com/read/28446582/auditory-fear-conditioning-modifies-steady-state-evoked-potentials-in-the-rat-inferior-colliculus
#15
André Luiz Vieira Lockmann, Flavio Afonso Gonçalves Mourão, Márcio Flávio Dutra Moraes
The rat inferior colliculus (IC) is a major midbrain relay for ascending inputs from the auditory brainstem and has been suggested to play a key role in the processing of aversive sounds. Previous studies have demonstrated that auditory fear conditioning (AFC) potentiates transient responses to brief tones in the IC, but it remains unexplored whether AFC modifies responses to sustained periodic acoustic stimulation - a type of response called steady-state evoked potential (SSEP). Here we used an amplitude-modulated tone - 10 kHz tone with a sinusoidal amplitude modulation of 53...
April 26, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28446047/effect-of-chronic-restraint-stress-on-inhibitory-gating-in-the-auditory-cortex-of-rats
#16
Lanlan Ma, Wai Li, Sibin Li, Xuejiao Wang, Ling Qin
A fundamental adaptive mechanism of auditory function is inhibitory gating (IG), which refers to the attenuation of neural responses to repeated sound stimuli. IG is drastically impaired in individuals with emotional and cognitive impairments (i.e., posttraumatic stress disorder). The objective of this study was to test whether chronic stress impairs the IG of the auditory cortex (AC). We used the standard two-tone stimulus paradigm and examined the parametric qualities of IG in the AC of rats by recording the electrophysiological signals of a single-unit and local field potential (LFP) simultaneously...
April 26, 2017: Stress: the International Journal on the Biology of Stress
https://www.readbyqxmd.com/read/28432143/focal-local-field-potential-lfp-signature-of-the-single-axon-monosynaptic-thalamocortical-connection
#17
Espen Hagen, Janne C Fossum, Klas H Pettersen, Jose-Manuel Alonso, Harvey A Swadlow, Gaute T Einevolla
Recent years have seen a resurgence in use of the extracellularly recorded local field potential (LFP) to investigate neural network activity. To probe monosynaptic thalamic activation of cortical postsynaptic target cells, so called spike-trigger-averaged LFP (stLFP) signatures have been measured. In these experiments the cortical LFP is measured by means of multielectrodes covering several cortical lamina and averaged on spontaneous spikes of thalamocortical (TC) cells. Using a well-established forward-modeling scheme, we investigate the biophysical origin of this stLFP signature with simultaneous synaptic activation of cortical layer 4 neurons, mimicking the effect of a single afferent spike from a single TC neuron...
April 21, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28431164/low-activity-microstates-during-sleep
#18
Hiroyuki Miyawaki, Yazan N Billeh, Kamran Diba
Study Objectives: To better understand the distinct activity patterns of the brain during sleep, we observed and investigated periods of diminished oscillatory and population spiking activity lasting for seconds during non-REM sleep, which we call "LOW" activity sleep. Methods: We analyzed spiking and local field potential (LFP) activity of hippocampal CA1 region alongside neocortical electroencephalogram (EEG) and electromyogram (EMG) in 19 sessions from four male Long-Evans rats (262-363g) during natural wake/sleep across the 24-hr cycle, as well as data from other brain regions obtained from http://crcns...
April 18, 2017: Sleep
https://www.readbyqxmd.com/read/28421552/gap-junction-modulation-of-low-frequency-oscillations-in-the-cerebellar-granule-cell-layer
#19
Jennifer Claire Robinson, C Andrew Chapman, Richard Courtemanche
Local field potential (LFP) oscillations in the granule cell layer (GCL) of the cerebellar cortex have been identified previously in the awake rat and monkey during immobility. These low-frequency oscillations are thought to be generated through local circuit interactions between Golgi cells and granule cells within the GCL. Golgi cells display rhythmic firing and pacemaking properties, and also are electrically coupled through gap junctions within the GCL. Here, we tested if gap junctions in the rat cerebellar cortex contribute to the generation of LFP oscillations in the GCL...
April 18, 2017: Cerebellum
https://www.readbyqxmd.com/read/28407378/new-morpholinium-and-piperidinium-based-ionic-liquids-functionalized-with-ethoxyethyl-side-chains-as-electrolyte-components-in-lithium-and-lithium-ion-batteries
#20
Maria Assunta Navarra, Kanae Fujimura, Mirko Sgambetterra, Akiko Tsurumaki, Stefania Panero, Nobufumi Nakamura, Hiroyuki Ohno, Bruno Scrosati
In the present work, two ionic liquids, N-ethoxyethyl-N-methylmorpholinium bis(trifluoromethanesulfonyl)imide (M1,2O2TFSI) and N-ethoxyethyl-N-methylpiperidinium bis(trifluoromethane-sulfonyl)imide (P1,2O2TFSI) have been synthesized and compared. Fundamental relevant properties, such as thermal and electrochemical stability, density and ionic conductivity were analyzed to evaluate the effects caused by the presence of the ether bond in the side chain and/or in the organic cation ring. Upon lithium salt addition, two electrolytes suitable for lithium batteries applications were found...
April 13, 2017: ChemSusChem
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