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Intraparietal

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https://www.readbyqxmd.com/read/29774244/classification-and-characterisation-of-brain-network-changes-in-chronic-back-pain-a-multicenter-study
#1
Hiroaki Mano, Gopal Kotecha, Kenji Leibnitz, Takashi Matsubara, Aya Nakae, Nicholas Shenker, Masahiko Shibata, Valerie Voon, Wako Yoshida, Michael Lee, Toshio Yanagida, Mitsuo Kawato, Maria Joao Rosa, Ben Seymour
Background. Chronic pain is a common, often disabling condition thought to involve a combination of peripheral and central neurobiological factors. However, the extent and nature of changes in the brain is poorly understood. Methods. We investigated brain network architecture using resting-state fMRI data in chronic back pain patients in the UK and Japan (41 patients, 56 controls), as well as open data from USA. We applied machine learning and deep learning (conditional variational autoencoder architecture) methods to explore classification of patients/controls based on network connectivity...
2018: Wellcome Open Research
https://www.readbyqxmd.com/read/29755374/altered-amygdala-resting-state-functional-connectivity-and-hemispheric-asymmetry-in-patients-with-social-anxiety-disorder
#2
Ye-Ha Jung, Jung E Shin, Yoonji I Lee, Joon H Jang, Hang J Jo, Soo-Hee Choi
Background: The amygdala plays a key role in emotional hyperreactivity in response to social threat in patients with social anxiety disorder (SAD). We investigated resting-state functional connectivity (rs-FCN) of the left and right amygdala with various brain regions and functional lateralization in patients with SAD. Methods: A total of 36 patients with SAD and 42 matched healthy controls underwent functional magnetic resonance imaging (fMRI) at rest. Using the left and right amygdala as seed regions, we compared the strength of the rs-FCN in the patient and control groups...
2018: Frontiers in Psychiatry
https://www.readbyqxmd.com/read/29747668/magnitude-processing-of-symbolic-and-non-symbolic-proportions-an-fmri-study
#3
Julia Mock, Stefan Huber, Johannes Bloechle, Julia F Dietrich, Julia Bahnmueller, Johannes Rennig, Elise Klein, Korbinian Moeller
BACKGROUND: Recent research indicates that processing proportion magnitude is associated with activation in the intraparietal sulcus. Thus, brain areas associated with the processing of numbers (i.e., absolute magnitude) were activated during processing symbolic fractions as well as non-symbolic proportions. Here, we investigated systematically the cognitive processing of symbolic (e.g., fractions and decimals) and non-symbolic proportions (e.g., dot patterns and pie charts) in a two-stage procedure...
May 10, 2018: Behavioral and Brain Functions: BBF
https://www.readbyqxmd.com/read/29745430/working-memory-dependence-of-spatial-contextual-cueing-for-visual-search
#4
Stefan Pollmann
When spatial stimulus configurations repeat in visual search, a search facilitation, resulting in shorter search times, can be observed that is due to incidental learning. This contextual cueing effect appears to be rather implicit, uncorrelated with observers' explicit memory of display configurations. Nevertheless, as I review here, this search facilitation due to contextual cueing depends on visuospatial working memory resources, and it disappears when visuospatial working memory is loaded by a concurrent delayed match to sample task...
May 10, 2018: British Journal of Psychology
https://www.readbyqxmd.com/read/29744804/frontal-lobe-functioning-during-a-simple-response-conflict-task-in-first-episode-psychosis-and-its-relationship-to-treatment-response
#5
Keith M Shafritz, Toshikazu Ikuta, Allison Greene, Delbert G Robinson, Juan Gallego, Todd Lencz, Pamela DeRosse, Peter B Kingsley, Philip R Szeszko
Prior functional magnetic resonance imaging (fMRI) studies have investigated the neural mechanisms underlying cognitive control in patients with psychosis with findings of both hypo- and hyperfrontality. One factor that may contribute to inconsistent findings is the use of complex and polyfactorial tasks to investigate frontal lobe functioning. In the current study we employed a simple response conflict task during fMRI to examine differences in brain activation between patients experiencing their first-episode of psychosis (n = 33) and age- and sex-matched healthy volunteers (n = 33)...
May 9, 2018: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/29739867/flexible-coding-of-visual-working-memory-representations-during-distraction
#6
Elizabeth S Lorenc, Kartik K Sreenivasan, Derek E Nee, Annelinde R E Vandenbroucke, Mark D'Esposito
Visual working memory (VWM) recruits a broad network of brain regions, including prefrontal, parietal, and visual cortices. Recent evidence supports a "sensory recruitment" model of VWM, whereby precise visual details are maintained in the same stimulus-selective regions responsible for perception. A key question in evaluating the sensory recruitment model is how VWM representations persist through distracting visual input, given that the early visual areas that putatively represent VWM content are susceptible to interference from visual stimulation...
May 8, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29726766/defining-the-relationship-of-the-optic-radiation-to-the-roof-and-floor-of-the-ventricular-atrium-a-focused-microanatomical-study
#7
Christos Koutsarnakis, Aristotelis V Kalyvas, Spyridon Komaitis, Faidon Liakos, Georgios P Skandalakis, Christos Anagnostopoulos, George Stranjalis
OBJECTIVE The authors investigated the specific topographic relationship of the optic radiation fibers to the roof and floor of the ventricular atrium because the current literature is ambiguous. METHODS Thirty-five normal, adult, formalin-fixed cerebral hemispheres and 30 focused MRI slices at the level of the atrium were included in the study. The correlative anatomy of the optic radiation with regard to the atrial roof and floor was investigated in 15 specimens, each through focused fiber microdissections...
May 4, 2018: Journal of Neurosurgery
https://www.readbyqxmd.com/read/29723638/magnetic-stimulation-selectively-affects-pre-stimulus-eeg-microstates
#8
Pierpaolo Croce, Filippo Zappasodi, Spadone Sara, Paolo Capotosto
Different electrophysiological (EEG) correlates may provide specific important assessment of the period that anticipates an imperative stimulus. Previous study of our group showed that a local (i.e. parietal) anticipatory EEG marker (i.e. the event related de-synchronization of the alpha rhythms; ERD) is selectively affected when transcranial magnetic stimulation (TMS) is delivered over crucial nodes belonging to well-known human networks involved in different cognitive domains. Here, we investigated whether such distinction is also present in the whole brain activity as seen through the pre-stimulus microstate's topography, representing a global and reference-free measure of the neural activity...
April 30, 2018: NeuroImage
https://www.readbyqxmd.com/read/29720551/behavioral-and-neural-representations-of-spatial-directions-across-words-schemas-and-images
#9
Steven M Weisberg, Steven A Marchette, Anjan Chatterjee
Modern spatial navigation requires fluency with multiple representational formats, including visual scenes, signs, and words. These formats convey different information. Visual scenes are rich and specific, but contain extraneous details. Arrows, as an example of signs, are schematic representations in which the extraneous details are eliminated, but analog spatial properties are preserved. Words eliminate all spatial information and convey spatial directions in a purely abstract form. How does the human brain compute spatial directions within and across these formats? To investigate this question, we conducted two experiments on men and women: a behavioral study that was preregistered, and a neuroimaging study using multivoxel pattern analysis of fMRI data to uncover similarities and differences among representational formats...
May 2, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29718927/predictive-saccades-in-children-and-adults-a-combined-fmri-and-eye-tracking-study
#10
Katerina Lukasova, Mariana P Nucci, Raymundo Machado de Azevedo Neto, Gilson Vieira, João R Sato, Edson Amaro
Saccades were assessed in 21 adults (age 24 years, SD = 4) and 15 children (age 11 years, SD = 1), using combined functional magnetic resonance imaging (fMRI) and eye-tracking. Subjects visually tracked a point on a horizontal line in four conditions: time and position predictable task (PRED), position predictable (pPRED), time predictable (tPRED) and visually guided saccades (SAC). Both groups in the PRED but not in pPRED, tPRED and SAC produced predictive saccades with latency below 80 ms. In task versus group comparisons, children's showed less efficient learning compared to adults for predictive saccades (adults = 48%, children = 34%, p = 0...
2018: PloS One
https://www.readbyqxmd.com/read/29710767/effects-of-excitatory-repetitive-transcranial-magnetic-stimulation-of-the-p3-point-in-chronic-stroke-patients-case-reports
#11
Ronaldo Luis da Silva, Angela Maria Costa de Souza, Francielly Ferreira Santos, Sueli Toshie Inoue, Johanne Higgins, Victor Frak
OBJECTIVE: To evaluate the effects of excitatory repetitive transcranial magnetic stimulation (rTMS) of the international 10⁻20 system P3 point (intraparietal sulcus region) in chronic patients with a frontal lesion and parietal sparing due to stroke on the impaired upper (UL) and lower limb (LL) as measured by the Fugl-Meyer Assessment (FMA). METHODS: Three patients (C1: 49.83/2.75, C2: 53.17/3.83, C3: 63.33/3.08-years-old at stroke/years post-stroke, respectively) received two weeks (five days/week) of rTMS at 10 Hz of P3...
April 28, 2018: Brain Sciences
https://www.readbyqxmd.com/read/29710718/the-progressive-acalculia-presentation-of-parietal-variant-alzheimer-s-disease
#12
Mario F Mendez, Negar Moheb, Randy E Desarzant, Edmond H Teng
BACKGROUND: Many patients with early-onset Alzheimer's disease (EOAD; age of onset <65 years) have non-amnestic presentations involving language (logopenic primary progressive aphasia, lvPPA), visuospatial abilities (posterior cortical atrophy, PCA), and even asymmetric symptoms consistent with corticobasal syndrome (CBS). An inferior parietal lobule variant of EOAD commonly presents with progressive difficulty with calculations. METHODS: We reviewed 276 EOAD patients for presentations with predominant acalculia...
April 28, 2018: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/29700893/action-and-semantic-tool-knowledge-effective-connectivity-in-the-underlying-neural-networks
#13
Nina N Kleineberg, Anna Dovern, Ellen Binder, Christian Grefkes, Simon B Eickhoff, Gereon R Fink, Peter H Weiss
Evidence from neuropsychological and imaging studies indicate that action and semantic knowledge about tools draw upon distinct neural substrates, but little is known about the underlying interregional effective connectivity. With fMRI and dynamic causal modeling (DCM) we investigated effective connectivity in the left-hemisphere (LH) while subjects performed (i) a function knowledge and (ii) a value knowledge task, both addressing semantic tool knowledge, and (iii) a manipulation (action) knowledge task. Overall, the results indicate crosstalk between action nodes and semantic nodes...
April 26, 2018: Human Brain Mapping
https://www.readbyqxmd.com/read/29683390/neural-correlates-of-speed-tuned-motion-perception-in-healthy-adults
#14
Kimberly Meier, Marita Partanen, Deborah Giaschi
It has been suggested that slow and medium-to-fast speeds of motion may be processed by at least partially separate mechanisms. The purpose of this study was to establish the cortical areas activated during motion-defined form and global motion tasks as a function of speed, using functional magnetic resonance imaging. Participants performed discrimination tasks with random dot stimuli at high coherence, at coherence near their own thresholds, and for random motion. Stimuli were moving at 0.1 or 5 deg/s. In the motion-defined form task, lateral occipital complex, V5/MT+ and intraparietal sulcus showed greater activation by high or near-threshold coherence than by random motion stimuli; V5/MT+ and intraparietal sulcus demonstrated greater activation for 5 than 0...
January 1, 2018: Perception
https://www.readbyqxmd.com/read/29671156/alteration-and-role-of-interhemispheric-and-intrahemispheric-connectivity-in-motor-network-after-stroke
#15
Jungsoo Lee, Eunhee Park, Ahee Lee, Won Hyuk Chang, Dae-Shik Kim, Yun-Hee Kim
This study investigated local and global changes in the motor network using longitudinal resting-state functional magnetic resonance imaging (rs-fMRI). Motor impairment was measured in 81 stroke patients using Fugl-Meyer assessment on the same day as rs-fMRI acquisition at both 2 weeks and 3 months post-stroke. The relationships between network measures and motor function scores were assessed. With regard to local connectivity, interhemispheric connectivity was noticeably altered at each time point. Interhemispheric connectivity was also related to residual motor function and improvement in motor function...
April 18, 2018: Brain Topography
https://www.readbyqxmd.com/read/29670138/differential-medial-temporal-lobe-and-parietal-cortical-contributions-to-real-world-autobiographical-episodic-and-autobiographical-semantic-memory
#16
Thackery I Brown, Jesse Rissman, Tiffany E Chow, Melina R Uncapher, Anthony D Wagner
Autobiographical remembering can depend on two forms of memory: episodic (event) memory and autobiographical semantic memory (remembering personally relevant semantic knowledge, independent of recalling a specific experience). There is debate about the degree to which the neural signals that support episodic recollection relate to or build upon autobiographical semantic remembering. Pooling data from two fMRI studies of memory for real-world personal events, we investigated whether medial temporal lobe (MTL) and parietal subregions contribute to autobiographical episodic and semantic remembering...
April 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29668504/repetitive-transcranial-magnetic-stimulation-over-right-intraparietal-sulcus-enhances-emotional-face-processing-in-the-left-visual-field
#17
Chenggui Fan, Chaoyang Wan, Junjun Zhang, Zhenlan Jin, Ling Li
The frontoparietal network is largely involved in the process of emotional face perception and attention. However, how the right intraparietal sulcus (rIPS) may guide this process is not yet established. The effect of repetitive transcranial magnetic stimulation (rTMS) over the intraparietal sulcus in the perception of emotional faces is still unclear. To address that, we applied a modified Posner attention task where participants discriminated backward-masked emotional faces at the valid side and delivered 10-Hz rTMS over rIPS and vertex...
April 17, 2018: Neuroreport
https://www.readbyqxmd.com/read/29666567/the-neural-correlates-of-grasping-in-left-handers-when-handedness-does-not-matter
#18
Chiara Begliomini, Luisa Sartori, Maria G Di Bono, Sanja Budisavljević, Umberto Castiello
Neurophysiological studies showed that in macaques, grasp-related visuomotor transformations are supported by a circuit involving the anterior part of the intraparietal sulcus, the ventral and the dorsal region of the premotor area. In humans, a similar grasp-related circuit has been revealed by means of neuroimaging techniques. However, the majority of "human" studies considered movements performed by right-handers only, leaving open the question of whether the dynamics underlying motor control during grasping is simply reversed in left-handers with respect to right-handers or not...
2018: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/29660090/inhibition-of-left-anterior-intraparietal-sulcus-shows-that-mutual-adjustment-marks-dyadic-joint-actions-in-humans
#19
Vanessa Era, Matteo Candidi, Marco Gandolfo, Lucia Maria Sacheli, Salvatore Maria Aglioti
Creating real-life dynamic contexts to study interactive behaviors is a fundamental challenge for the social neuroscience of interpersonal relations. Real synchronic interpersonal motor interactions involve online, inter-individual mutual adaptation (the ability to adapt one's movements to those of another in order to achieve a shared goal). In order to study the contribution of the left anterior Intra Parietal Sulcus (aIPS) (i.e. a region supporting motor functions) to mutual adaptation, here, we combined a behavioral grasping task where pairs of participants synchronized their actions when performing mutually adaptive imitative and complementary movements, with the inhibition of activity in the aIPS via non-invasive brain stimulation...
April 5, 2018: Social Cognitive and Affective Neuroscience
https://www.readbyqxmd.com/read/29655488/discriminability-of-numerosity-evoked-fmri-activity-patterns-in-human-intra-parietal-cortex-reflects-behavioral-numerical-acuity
#20
Gabriel Lasne, Manuela Piazza, Stanislas Dehaene, Andreas Kleinschmidt, Evelyn Eger
Areas of the primate intraparietal cortex have been identified as an important substrate of numerical cognition. In human fMRI studies, activity patterns in these and other areas have allowed researchers to read out the numerosity a subject is viewing, but the relation of such decodable information with behavioral numerical proficiency remains unknown. Here, we estimated the precision of behavioral numerosity discrimination (internal Weber fraction) in twelve adult subjects based on psychophysical testing in a delayed numerosity comparison task outside the scanner...
March 23, 2018: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
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