keyword
MENU ▼
Read by QxMD icon Read
search

Superior colliculus

keyword
https://www.readbyqxmd.com/read/28729937/manganese-enhanced-magnetic-resonance-imaging-combined-with-electrophysiology-in-the-evaluation-of-visual-pathway-in-experimental-rat-models-with-monocular-blindness
#1
Zuohua Tang, Jie Wang, Zebin Xiao, Xinghuai Sun, Xiaoyuan Feng, Weijun Tang, Qian Chen, Lingjie Wu, Rong Wang, Yufeng Zhong, Wentao Wang, Jianfeng Luo
PURPOSE: Our study aimed to explore the feasibility of manganese-enhanced magnetic resonance imaging (MEMRI) combined with visual evoked potentials (VEP) and auditory evoked visual cortex responses (AVR) in evaluating for the establishment of visual/auditory compensatory pathways after monocular blindness. MATERIALS AND METHODS: A total of 14 healthy neonatal male Sprague-Dawley rats were randomly divided into two groups (n = 7 for Groups A and B). Right optic nerve (ON) transection was performed on the 7 rats of Group A to obtain a monocularly blind model, and the 7 rats of Group B were chosen as the control group...
July 2017: Brain and Behavior
https://www.readbyqxmd.com/read/28690587/brain-connectivity-patterns-dissociate-action-of-specific-acupressure-treatments-in-fatigued-breast-cancer-survivors
#2
Richard E Harris, Eric Ichesco, Chelsea Cummiford, Johnson P Hampson, Thomas L Chenevert, Neil Basu, Suzanna M Zick
Persistent fatigue is a pernicious symptom in many cancer survivors. Existing treatments are limited or ineffective and often lack any underlying biologic rationale. Acupressure is emerging as a promising new intervention for persistent cancer-related fatigue; however, the underlying mechanisms of action are unknown. Our previous investigations suggested that fatigued breast cancer survivors have alterations in brain neurochemistry within the posterior insula and disturbed functional connectivity to the default mode network (DMN), as compared to non-fatigued breast cancer survivors...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28687521/simultaneous-gcamp6-based-fiber-photometry-and-fmri-in-rats
#3
Zhifeng Liang, Yuncong Ma, Glenn D R Watson, Nanyin Zhang
BACKGROUND: Understanding the relationship between neural and vascular signals is essential for interpretation of functional MRI (fMRI) results with respect to underlying neuronal activity. Simultaneously measuring neural activity using electrophysiology with fMRI has been highly valuable in elucidating the neural basis of the blood oxygenation-level dependent (BOLD) signal. However, this approach is also technically challenging due to the electromagnetic interference that is observed in electrophysiological recordings during MRI scanning...
July 4, 2017: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/28684852/the-normal-environment-delays-the-development-of-multisensory-integration
#4
Jinghong Xu, Liping Yu, Benjamin A Rowland, Barry E Stein
Multisensory neurons in animals whose cross-modal experiences are compromised during early life fail to develop the ability to integrate information across those senses. Consequently, they lack the ability to increase the physiological salience of the events that provide the convergent cross-modal inputs. The present study demonstrates that superior colliculus (SC) neurons in animals whose visual-auditory experience is compromised early in life by noise-rearing can develop visual-auditory multisensory integration capabilities rapidly when periodically exposed to a single set of visual-auditory stimuli in a controlled laboratory paradigm...
July 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28669762/space-specific-deficits-in-visual-orientation-discrimination-caused-by-lesions-in-the-midbrain-stimulus-selection-network
#5
Eric I Knudsen, Jason S Schwarz, Phyllis F Knudsen, Devarajan Sridharan
Perceptual decisions require both analysis of sensory information and selective routing of relevant information to decision networks. This study explores the contribution of a midbrain network to visual perception in chickens. Analysis of visual orientation information in birds takes place in the forebrain sensory area called the Wulst, as it does in the primary visual cortex (V1) of mammals. In contrast, the midbrain, which receives parallel retinal input, encodes orientation poorly, if at all. We discovered, however, that small electrolytic lesions in the midbrain severely impair a chicken's ability to discriminate orientations...
June 19, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28660235/a-co-culture-model-for-determining-the-target-specificity-of-the-de-novo-generated-retinal-ganglion-cells
#6
Pooja Teotia, Matthew J Van Hook, Iqbal Ahmad
In glaucoma, the output neurons of the retina, the retinal ganglion cells (RGCs), progressively degenerate, leading to irreversible blindness (Ahram et al., 2015). The ex vivo stem cell method to replace degenerated RGCs remains a potentially viable approach (Levin et al., 2004). However, the success of the approach depends upon the ability of the de novo generated RGCs to connect over the long distance with specific targets in the central visual pathway. Here, we describe a protocol to examine the target specificity of the de novo generated RGCs using a co-culture approach where the RGCs neurites are allowed to choose between specific (superior colliculus; SC) and non-specific (inferior colliculus; IC) tectal targets...
April 5, 2017: Bio-protocol
https://www.readbyqxmd.com/read/28657115/monosynaptic-retrograde-tracing-of-neurons-expressing-the-g-protein-coupled-receptor-gpr151-in-the-mouse-brain
#7
Jonas Broms, Matilda Grahm, Lea Haugegaard, Thomas Blom, Konstantinos Meletis, Anders Tingström
GPR151 is a G-protein coupled receptor for which the endogenous ligand remains unknown. In the nervous system of vertebrates, its expression is enriched in specific diencephalic structures, where the highest levels are observed in the habenular area. The habenula has been implicated in a range of different functions including behavioral flexibility, decision making, inhibitory control and pain processing, which makes it a promising target for treating psychiatric and neurological disease. This study aimed to further characterize neurons expressing the Gpr151 gene, by tracing the afferent connectivity of this diencephalic cell population...
June 28, 2017: Journal of Comparative Neurology
https://www.readbyqxmd.com/read/28628005/emergence-of-visually-evoked-reward-expectation-signals-in-dopamine-neurons-via-the-superior-colliculus-in-v1-lesioned-monkeys
#8
Norihiro Takakuwa, Rikako Kato, Peter Redgrave, Tadashi Isa
Responses of midbrain dopamine (DA) neurons reflecting expected reward from sensory cues are critical for reward-based associative learning. However, critical pathways by which reward-related visual information is relayed to DA neurons remain unclear. To address this question, we investigated Pavlovian conditioning in macaque monkeys with unilateral primary visual cortex (V1) lesions (an animal model of 'blindsight'). Anticipatory licking responses to obtain juice drops were elicited in response to visual conditioned stimuli (CS) in the affected visual field...
June 19, 2017: ELife
https://www.readbyqxmd.com/read/28620279/interleukin-6-deficiency-attenuates-retinal-ganglion-cell-axonopathy-and-glaucoma-related-vision-loss
#9
Franklin D Echevarria, Cathryn R Formichella, Rebecca M Sappington
The pleotropic cytokine interleukin-6 (IL-6) is implicated in retinal ganglion cell (RGC) survival and degeneration, including that associated with glaucoma. IL-6 protects RGCs from pressure-induced apoptosis in vitro. However, it is unknown how IL-6 impacts glaucomatous degeneration in vivo. To study how IL-6 influences glaucomatous RGC axonopathy, accompanying glial reactivity, and resultant deficits in visual function, we performed neural tracing, histological, and neurobehavioral assessments in wildtype (B6;129SF2/J; WT) and IL-6 knock-out mice (B6;129S2-IL6(t)(m1kopf)/J; IL-6-/-) after 8 weeks of unilateral or bilateral microbead-induced glaucoma (microbead occlusion model)...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28617660/circuits-for-action-and-cognition-a-view-from-the-superior-colliculus
#10
Michele A Basso, Paul J May
The superior colliculus is one of the most well-studied structures in the brain, and with each new report, its proposed role in behavior seems to increase in complexity. Forty years of evidence shows that the colliculus is critical for reorienting an organism toward objects of interest. In monkeys, this involves saccadic eye movements. Recent work in the monkey colliculus and in the homologous optic tectum of the bird extends our understanding of the role of the colliculus in higher mental functions, such as attention and decision making...
June 15, 2017: Annual Review of Vision Science
https://www.readbyqxmd.com/read/28607399/rim1-2-in-retinal-ganglion-cells-are-required-for-the-refinement-of-ipsilateral-axons-and-eye-specific-segregation
#11
Ahlem Assali, Corentin Le Magueresse, Mohamed Bennis, Xavier Nicol, Patricia Gaspar, Alexandra Rebsam
Neural activity is crucial for the refinement of neuronal connections during development, but the contribution of synaptic release mechanisms is not known. In the mammalian retina, spontaneous neural activity controls the refinement of retinal projections to the dorsal lateral geniculate nucleus (dLGN) and the superior colliculus (SC) to form appropriate topographic and eye-specific maps. To evaluate the role of synaptic release, the rab-interacting molecules (RIMs), a family of active zone proteins that play a central role in calcium-triggered release, were conditionally ablated in a subset of retinal ganglion cells (RGCs)...
June 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28605641/spectral-and-temporal-auditory-processing-in-the-superior-colliculus-of-aged-rats
#12
Margarida Costa, Franco Lepore, Jean-Paul Guillemot
Presbyacusis reflects dysfunctions present along the central auditory pathway. Given that the topographic representation of the auditory directional spatial map is deteriorated in the superior colliculus of aged animals, therefore, are spectral and temporal auditory processes altered with aging in the rat's superior colliculus? Extracellular single-unit recordings were conducted in the superior colliculus of anesthetized Sprague-Dawley adult (10 months) and aged (22 months) rats. In the spectral domain, level thresholds in aged rats were significantly increased when superior colliculus auditory neurons were stimulated with pure tones or Gaussian noise bursts...
May 22, 2017: Neurobiology of Aging
https://www.readbyqxmd.com/read/28602919/the-fine-tuning-of-retinocollicular-topography-depends-on-reelin-signaling-during-early-postnatal-development-of-the-rat-visual-system
#13
Rachel Antonioli-Santos, Bruna Lanzillotta-Mattos, Cecília Hedin-Pereira, Claudio Alberto Serfaty
During postnatal development, neural circuits are extremely dynamic and develop precise connection patterns that emerge as a result of the elimination of synaptic terminals, a process instructed by molecular cues and patterns of electrical activity. In the rodent visual system, this process begins during the first postnatal week and proceeds during the second and third postnatal weeks as spontaneous retinal activity and finally use-dependent fine tuning takes place. Reelin is a large extracellular matrix glycoprotein able to affect several steps of brain development, from neuronal migration to the maturation of dendritic spines and use-dependent synaptic development...
June 8, 2017: Neuroscience
https://www.readbyqxmd.com/read/28600558/look-me-in-the-eyes-constraining-gaze-in-the-eye-region-provokes-abnormally-high-subcortical-activation-in-autism
#14
Nouchine Hadjikhani, Jakob Åsberg Johnels, Nicole R Zürcher, Amandine Lassalle, Quentin Guillon, Loyse Hippolyte, Eva Billstedt, Noreen Ward, Eric Lemonnier, Christopher Gillberg
Individuals with Autism Spectrum Disorder (ASD) seem to have difficulties looking others in the eyes, but the substrate for this behavior is not well understood. The subcortical pathway, which consists of superior colliculus, pulvinar nucleus of the thalamus, and amygdala, enables rapid and automatic face processing. A specific component of this pathway - i.e., the amygdala - has been shown to be abnormally activated in paradigms where individuals had to specifically attend to the eye-region; however, a direct examination of the effect of manipulating the gaze to the eye-regions on all the components of the subcortical system altogether has never been performed...
June 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28592684/trajectory-curvature-in-saccade-sequences-spatiotopic-influences-vs-residual-motor-activity
#15
Geoffrey Mégardon, Casimir Johannes Hendrikus Ludwig, Petroc Sumner
When decisions drive saccadic eye movements, traces of the decision process can be inferred from the movement trajectories. For example, saccades can curve away from distractor stimuli, which was thought to reflect cortical inhibition biasing activity in the Superior Colliculus. Recent neurophysiological work does not support this theory, and two recent models have replaced top-down inhibition with lateral interactions in the Superior Colliculus or neural fatigue in the brainstem Saccadic Burst Generator. All current models operate in retinotopic coordinates and are based on single saccade paradigms...
June 7, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28539242/manganese-enhanced-mr-imaging-memri-combined-with-electrophysiology-in-the-study-of-cross-modal-plasticity-in-binocularly-blind-rats
#16
Zuohua Tang, Lingjie Wu, Zebin Xiao, Xinghuai Sun, Xiaoyuan Feng, Qian Chen, Jiawen Fan, Jie Wang, Wentao Wang, Jianfeng Luo, Lixin Jin
Our study aimed to determine and verify the establishment of visual to auditory cross-modal plasticity using manganese-enhanced MR imaging (MEMRI) combined with examinations of the visual evoked potential (VEP), auditory brainstem response (ABR) and bilateral visual cortex response to a bilateral auditory stimulus (AVR). Fourteen healthy male Sprague-Dawley newborn rats were randomly divided into 2 groups (n=7 per group). Optic nerve transection was performed in the 7 rats of Group A three weeks after birth to obtain binocularly blind models, and the 7 rats of Group B were maintained as the control group...
May 21, 2017: International Journal of Developmental Neuroscience
https://www.readbyqxmd.com/read/28533384/changes-in-perceptual-sensitivity-related-to-spatial-cues-depends-on-subcortical-activity
#17
Lee P Lovejoy, Richard J Krauzlis
Spatial cues allow animals to selectively attend to relevant visual stimuli while ignoring distracters. This process depends on a distributed neuronal network, and an important current challenge is to understand the functional contributions made by individual brain regions within this network and how these contributions interact. Recent findings point to a possible anatomical segregation, with cortical and subcortical brain regions contributing to different functional components of selective attention. Cortical areas, especially visual cortex, may be responsible for implementing changes in perceptual sensitivity by changing the signal-to-noise ratio, whereas other regions, such as the superior colliculus, may be involved in processes that influence selection between competing stimuli without regulating perceptual sensitivity...
June 6, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28528360/a-spiking-neural-network-model-of-the-midbrain-superior-colliculus-that-generates-saccadic-motor-commands
#18
Bahadir Kasap, A John van Opstal
Single-unit recordings suggest that the midbrain superior colliculus (SC) acts as an optimal controller for saccadic gaze shifts. The SC is proposed to be the site within the visuomotor system where the nonlinear spatial-to-temporal transformation is carried out: the population encodes the intended saccade vector by its location in the motor map (spatial), and its trajectory and velocity by the distribution of firing rates (temporal). The neurons' burst profiles vary systematically with their anatomical positions and intended saccade vectors, to account for the nonlinear main-sequence kinematics of saccades...
May 20, 2017: Biological Cybernetics
https://www.readbyqxmd.com/read/28521141/indirect-pathway-of-caudal-basal-ganglia-for-rejection-of-valueless-visual-objects
#19
Hyoung F Kim, Hidetoshi Amita, Okihide Hikosaka
The striatum controls behavior in two ways: facilitation and suppression through the direct and indirect pathways, respectively. However, it is still unclear what information is processed in these pathways. To address this question, we studied two pathways originating from the primate caudate tail (CDt). We found that the CDt innervated the caudal-dorsal-lateral part of the substantia nigra pars reticulata (cdlSNr), directly or indirectly through the caudal-ventral part of the globus pallidus externus (cvGPe)...
May 17, 2017: Neuron
https://www.readbyqxmd.com/read/28498493/involvement-of-microglia-in-early-axoglial-alterations-of-the-optic-nerve-induced-by-experimental-glaucoma
#20
Melina P Bordone, María F González Fleitas, Laura A Pasquini, Alejandra Bosco, Pablo H Sande, Ruth E Rosenstein, Damián Dorfman
Glaucoma is a leading cause of blindness, characterized by retinal ganglion cell (RGC) loss and optic nerve (ON) damage. Cumulative evidence suggests glial cell involvement in the degeneration of the ON and RGCs. We analyzed the contribution of microglial reactivity to early axoglial alterations of the ON in an induced model of ocular hypertension. For this purpose, vehicle or chondroitin sulfate (CS) were weekly injected into the eye anterior chamber from Wistar rats for different intervals. The amount of Brn3a(+) RGC significantly decreased in CS-injected eyes for 10 and 15 (but not 6) weeks...
May 12, 2017: Journal of Neurochemistry
keyword
keyword
75827
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"