keyword
MENU ▼
Read by QxMD icon Read
search

Posterior parietal cortex

keyword
https://www.readbyqxmd.com/read/29018338/altered-distant-synchronization-of-background-network-in-mild-cognitive-impairment-during-an-executive-function-task
#1
Pengyun Wang, Rui Li, Jing Yu, Zirui Huang, Zhixiong Yan, Ke Zhao, Juan Li
Few studies to date have investigated the background network in the cognitive state relying on executive function in mild cognitive impairment (MCI) patients. Using the index of degree of centrality (DC), we explored distant synchronization of background network in MCI during a hybrid delayed-match-to-sample task (DMST), which mainly relies on the working memory component of executive function. We observed significant interactions between group and cognitive state in the bilateral posterior cingulate cortex (PCC) and the ventral subregion of precuneus...
2017: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/28993722/type-1-diabetes-and-impaired-awareness-of-hypoglycemia-are-associated-with-reduced-brain-gray-matter-volumes
#2
Petr Bednarik, Amir A Moheet, Heidi Grohn, Anjali F Kumar, Lynn E Eberly, Elizabeth R Seaquist, Silvia Mangia
In this study, we retrospectively analyzed the anatomical MRI data acquired from 52 subjects with type 1 diabetes (26M/26F, 36 ± 11 years old, A1C = 7.2 ± 0.9%) and 50 age, sex and BMI frequency-matched non-diabetic controls (25M/25F, 36 ± 14 years old). The T1D group was further sub-divided based on whether subjects had normal, impaired, or indeterminate awareness of hypoglycemia (n = 31, 20, and 1, respectively). Our goals were to test whether the gray matter (GM) volumes of selected brain regions were associated with diabetes status as well as with the status of hypoglycemia awareness...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28992273/neural-correlates-of-moral-judgment-in-pedophilia
#3
Claudia Massau, Christian Kärgel, Simone Weiß, Martin Walter, Jorge Ponseti, Tillmann Hc Krueger, Henrik Walter, Boris Schiffer
Pedophilia is a sexual preference that is often associated with child sex offending (CSO). Sexual urges towards prepubescent children and specifically acting upon those urges are universally regarded as immoral. However, up until now, it is completely unknown whether moral processing of sexual offenses is altered in pedophiles. A total of 31 pedophilic men and 19 healthy controls were assessed by using functional magnetic resonance imaging (fMRI) in combination with a moral judgment paradigm consisting of 36 scenarios describing different types of offenses...
September 1, 2017: Social Cognitive and Affective Neuroscience
https://www.readbyqxmd.com/read/28985532/the-role-of-premotor-and-parietal-cortex-during-monitoring-of-involuntary-movement-a-combined-tms-and-tdcs-study
#4
Valentina Bruno, Carlotta Fossataro, Nadia Bolognini, Luca Zigiotto, Giuseppe Vallar, Anna Berti, Francesca Garbarini
Converging evidence on voluntary actions underlays the existence of a motor monitoring system able to compare the predicted and the actual consequences of our movements. In this context, both the premotor cortex (PMC) and the posterior parietal cortex (PPC) play a role in action monitoring and awareness. The present study explores the role of PMC and PPC in monitoring involuntary muscle contractions induced by transcranial magnetic stimulation (TMS) over the hand motor area. To this aim, the effects of transcranial direct current stimulation (tDCS) over PMC and PPC were examined...
September 9, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/28984525/brain-networks-related-to-beta-oscillatory-activity-during-episodic-memory-retrieval
#5
Erika Nyhus
Evidence from fMRI has consistently located a widespread network of frontal, parietal, and temporal lobe regions during episodic retrieval. However, the temporal limitations of the fMRI methodology have made it difficult to assess the transient network dynamics by which these distributed regions coordinate activity. Recent evidence suggests that beta oscillations (17-20 Hz) are important for top-down control for memory suppression. However, the spatial limitations of the EEG methodology make it difficult to assess the relationship between these oscillatory signals and the distributed networks identified with fMRI...
October 6, 2017: Journal of Cognitive Neuroscience
https://www.readbyqxmd.com/read/28983233/the-behavioral-effects-of-tdcs-on-visual-search-performance-are-not-influenced-by-the-location-of-the-reference-electrode
#6
Amanda Ellison, Keira L Ball, Alison R Lane
We investigated the role of reference electrode placement (ipsilateral v contralateral frontal pole) on conjunction visual search task performance when the transcranial direct current stimulation (tDCS) cathode is placed over right posterior parietal cortex (rPPC) and over right frontal eye fields (rFEF), both of which have been shown to be causally involved in the processing of this task using TMS. This resulted in four experimental manipulations in which sham tDCS was applied in week one followed by active tDCS the following week...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28980612/-topographical-disorientation-in-patients-with-brain-impairment
#7
V N Grigoryeva, G V Tikhomirov
Topographical disorientation refers to inability to recognize the environment, as well as to orient, to find the right way into a familiar or new environment and to use a map for the orientation. These functions are based on neuronal activity of posterior parietal cortex, retrosplenial cortex and the posterior part of cingular gyrus, medial temporal lobe, lingual gyrus and prefrontal cortex and are considered within egocentric or allocentric (exocentric) reference systems. Object locations in the egocentric system are evaluated with respect to the subject's body position while object locations in the allocentric reference frame are evaluated with respect to the object-to-object relations in the external environment...
2017: Zhurnal Nevrologii i Psikhiatrii Imeni S.S. Korsakova
https://www.readbyqxmd.com/read/28980607/-metavestibular-disorders-and-disorders-of-higher-vestibular-function
#8
M V Zamergrad, O S Levin
Vertigo, instability, oscillopsia and concomitant autonomic disorders are classical and well-known symptoms of vestibular disorders. At the same time, recent studies suggest that there are more complicated vestibular dysfunctions caused by the cortical projections of the vestibular system. The central vestibular system includes parietal temporal cortex and insular, anterior intraparietal sulcus, posterior parietal and medial parts of the superior temporal gyrus, singular gyrus retrosplenial cortex, hippocampus and parahippocampal area...
2017: Zhurnal Nevrologii i Psikhiatrii Imeni S.S. Korsakova
https://www.readbyqxmd.com/read/28979176/noncanonical-adult-human-neurogenesis-and-axonal-growth-as-possible-structural-basis-of-recovery-from-traumatic-vegetative-state
#9
Yulia Vainshenker, Vsevolod Zinserling, Alexander Korotkov, Svyatoslav Medvedev
Patient recovering from traumatic vegetative state has suddenly died from cardiac arrest. In-life improvement of consciousness appeared after reduction of generalized spasticity due to botulinum toxin administration. Neuropathologic examination revealed Musashi1+, Nestin+, PCNA+, and Ki67+ cells in the hippocampus, frontal, parietal and occipital cortex, caudate, thalamus, mammillary bodies, brainstem, cerebellum, and near the posterior horn of the lateral ventricle. New neurons with neurite growth (TUC4+) appeared in corpus callosum...
2017: Clinical Medicine Insights. Case Reports
https://www.readbyqxmd.com/read/28978664/unaware-processing-of-tools-in-the-neural-system-for-object-directed-action-representation
#10
Marco Tettamanti, Francesca Conca, Andrea Falini, Daniela Perani
The hypothesis that the brain constitutively encodes observed manipulable objects for the actions they afford is still debated. Yet, crucial evidence demonstrating that, even in the absence of perceptual awareness, the mere visual appearance of a manipulable object triggers a visuomotor coding in the action representation system including the premotor cortex, has hitherto not been provided. In this fMRI study, we instantiated reliable unaware visual perception conditions by means of Continuous Flash Suppression, and we tested in 24 healthy human participants (13 females) whether the visuomotor object-directed action representation system that includes left-hemispheric premotor, parietal, and posterior temporal cortices is activated even under subliminal perceptual conditions...
October 4, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28975729/brain-processing-of-rectal-sensation-in-adolescents-with-functional-defecation-disorders-and-healthy-controls
#11
S M Mugie, I J N Koppen, M M van den Berg, P F C Groot, L Reneman, M B de Ruiter, M A Benninga
BACKGROUND: Decreased sensation of urge to defecate is often reported by children with functional constipation (FC) and functional nonretentive fecal incontinence (FNRFI). The aim of this cross-sectional study was to evaluate cerebral activity in response to rectal distension in adolescents with FC and FNRFI compared with healthy controls (HCs). METHODS: We included 15 adolescents with FC, 10 adolescents with FNRFI, and 15 young adult HCs. Rectal barostat was performed prior to functional magnetic resonance imaging (fMRI) to determine individual pressure thresholds for urge sensation...
October 4, 2017: Neurogastroenterology and Motility: the Official Journal of the European Gastrointestinal Motility Society
https://www.readbyqxmd.com/read/28971011/structurofunctional-resting-state-networks-correlate-with-motor-function-in-chronic-stroke
#12
Benjamin T Kalinosky, Reivian Berrios Barillas, Brian D Schmit
PURPOSE: Motor function and recovery after stroke likely rely directly on the residual anatomical connections in the brain and its resting-state functional connectivity. Both structural and functional properties of cortical networks after stroke are revealed using multimodal magnetic resonance imaging (MRI). Specifically, functional connectivity MRI (fcMRI) can extract functional networks of the brain at rest, while structural connectivity can be estimated from white matter fiber orientations measured with high angular-resolution diffusion imaging (HARDI)...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28970145/connectivity-of-the-hippocampus-and-broca-s-area-during-acquisition-of-a-novel-grammar
#13
Olga Kepinska, Mischa de Rover, Johanneke Caspers, Niels O Schiller
Following Opitz and Friederici (2003) suggesting interactions of the hippocampal system and the prefrontal cortex as the neural mechanism underlying novel grammar learning, the present fMRI study investigated functional connectivity of bilateral BA 44/45 and the hippocampus during an artificial grammar learning (AGL) task. Our results, contrary to the previously reported interactions, demonstrated parallel (but separate) contributions of both regions, each with their own interactions, to the process of novel grammar acquisition...
September 29, 2017: NeuroImage
https://www.readbyqxmd.com/read/28970144/habit-strength-is-predicted-by-activity-dynamics-in-goal-directed-brain-systems-during-training
#14
Katharina Zwosta, Hannes Ruge, Thomas Goschke, Uta Wolfensteller
Previous neuroscientific research revealed insights into the brain networks supporting goal-directed and habitual behavior, respectively. However, it remains unclear how these contribute to inter-individual differences in habit strength which is relevant for understanding not only normal behavior but also more severe dysregulations between these types of action control, such as in addiction. In the present fMRI study, we trained subjects on approach and avoidance behavior for an extended period of time before testing the habit strength of the acquired stimulus-response associations...
September 29, 2017: NeuroImage
https://www.readbyqxmd.com/read/28969381/distinct-spatiotemporal-patterns-of-neuronal-functional-connectivity-in-primary-progressive-aphasia-variants
#15
Kamalini G Ranasinghe, Leighton B Hinkley, Alexander J Beagle, Danielle Mizuiri, Susanne M Honma, Ariane E Welch, Isabel Hubbard, Maria Luisa Mandelli, Zachary A Miller, Coleman Garrett, Alice La, Adam L Boxer, John F Houde, Bruce L Miller, Keith A Vossel, Maria Luisa Gorno-Tempini, Srikantan S Nagarajan
Primary progressive aphasia is a syndrome characterized by progressive loss of language abilities with three main phenotypic clinical presentations, including logopenic, non-fluent/agrammatic, and semantic variants. Previous imaging studies have shown unique anatomic impacts within language networks in each variant. However, direct measures of spontaneous neuronal activity and functional integrity of these impacted neural networks in primary progressive aphasia are lacking. The aim of this study was to characterize the spatial and temporal patterns of resting state neuronal synchronizations in primary progressive aphasia syndromes...
October 1, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/28968894/the-causal-role-of-the-prefrontal-cortex-and-somatosensory-cortex-in-tactile-working-memory
#16
Di Zhao, Yong-Di Zhou, Mark Bodner, Yixuan Ku
In the present study, we searched for causal evidence linking activity in the bilateral primary somatosensory cortex (SI), posterior parietal cortex (PPC), and prefrontal cortex (PFC) with behavioral performance in vibrotactile working memory. Participants performed a vibrotactile delayed matching-to-sample task, while single-pulse transcranial magnetic stimulation (sp-TMS) was applied over these cortical areas at 100, 200, 300, 600, 1600, and 1900 ms after the onset of vibrotactile stimulation (200 ms duration)...
August 22, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/28968707/the-organization-of-working-memory-networks-is-shaped-by-early-sensory-experience
#17
Velia Cardin, Mary Rudner, Rita F De Oliveira, Josefine Andin, Merina T Su, Lilli Beese, Bencie Woll, Jerker Rönnberg
Early deafness results in crossmodal reorganization of the superior temporal cortex (STC). Here, we investigated the effect of deafness on cognitive processing. Specifically, we studied the reorganization, due to deafness and sign language (SL) knowledge, of linguistic and nonlinguistic visual working memory (WM). We conducted an fMRI experiment in groups that differed in their hearing status and SL knowledge: deaf native signers, and hearing native signers, hearing nonsigners. Participants performed a 2-back WM task and a control task...
August 30, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/28967282/resting-state-functional-connectivity-signature-of-treatment-effects-of-rtms-in-mal-de-debarquement-syndrome
#18
Han Yuan, Guofa Shou, Diamond Urbano, Lei Ding, Yoon-Hee Cha
Repetitive transcranial magnetic stimulation (rTMS) has been used in experimental protocols to treat Mal de Debarquement Syndrome (MdDS), a neurological condition that represents a maladaptive brain state resulting from entrainment to external oscillating motion. Medical treatments and biomarkers for MdDS remain limited but neuromodulation with rTMS has shown evidence for therapeutic effects. The current study took a neuroimaging approach to examine the neuromodulatory effect of rTMS on MdDS. Twenty individuals with MdDS underwent five daily treatments of rTMS over bilateral dorsolateral prefrontal cortex (DLPFC)...
October 1, 2017: Brain Connectivity
https://www.readbyqxmd.com/read/28965838/assessment-of-intra-and-inter-regional-interrelations-between-gaba-glx-and-bold-during-pain-perception-in-the-human-brain-a-combined-1-h-fmrs-and-fmri-study
#19
Marianne Cleve, Alexander Gussew, Gerd Wagner, Karl-Jürgen Bär, Jürgen R Reichenbach
To explore brain activity and the related neurochemical processes, current research focuses increasingly on the combined acquisition of (1)H MR spectra and fMRI data to investigate potential associations between local metabolite resting-state levels and stimulus-induced BOLD signal changes. In this study, whole-brain fMRI measurements and localized functional (1)H MEGA-PRESS MRS scans were conducted at 3T in healthy subjects prior to and during acute pain stimulation to quantify resting-state GABA+/tCr and Glx/tCr levels in the insular cortex together with their stimulus-induced changes and to explore associations between these neurochemical parameters with intra-regional but also inter-regional BOLD responses...
September 28, 2017: Neuroscience
https://www.readbyqxmd.com/read/28965651/altered-functional-connectivity-during-spatial-working-memory-in-children-with-heavy-prenatal-alcohol-exposure
#20
M Alejandra Infante, Eileen M Moore, Amanda Bischoff-Grethe, Susan F Tapert, Sarah N Mattson, Edward P Riley
Individuals prenatally exposed to alcohol often have impaired spatial working memory (SWM). This study examines functional connections of frontal and parietal regions that support SWM in children with and without prenatal alcohol exposure. Children ages 10 to 16 with histories of heavy prenatal alcohol exposure (AE group; n = 18) and controls (CON group; n = 19) underwent functional magnetic resonance imaging (fMRI) while performing a SWM task. Whole brain task-related functional connectivity of bilateral dorsolateral prefrontal cortex (DLPFC) and posterior parietal cortex (PPC) seed regions were estimated for each participant using a psychophysiological interaction approach...
November 2017: Alcohol
keyword
keyword
37356
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"