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https://www.readbyqxmd.com/read/29128469/the-different-patterns-of-seizure-induced-aphasia-in-temporal-lobe-epilepsies
#1
Agnès Trebuchon, Isabelle Lambert, Bernard Guisiano, Aileen McGonigal, Charline Perot, Francesca Bonini, Romain Carron, Catherine Liegeois-Chauvel, Patrick Chauvel, Fabrice Bartolomei
OBJECTIVES: Ictal language disturbances may occur in dominant hemisphere temporal lobe epilepsy (TLE), but little is known about the precise anatomoelectroclinical correlations. This study investigated the different facets of ictal aphasia in intracerebrally recorded TLE. METHODS: Video-stereoelectroencephalography (SEEG) recordings of 37 seizures in 17 right-handed patients with drug-resistant TLE were analyzed; SEEG electroclinical correlations between language disturbance and involvement of temporal lobe structures were assessed...
November 8, 2017: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/29116426/high-resolution-language-mapping-of-broca-s-region-with-transcranial-magnetic-stimulation
#2
Katrin Sakreida, Inga Lange, Klaus Willmes, Stefan Heim, Ferdinand Binkofski, Hans Clusmann, Georg Neuloh
Broca's region, corresponding roughly to cytoarchitectonic areas 44 and 45 in the inferior frontal cortex, holds a multifunctional role in language processing, as shown, e.g., by functional imaging data. Neuro-navigated transcranial magnetic stimulation (TMS) enables complementary non-invasive mapping of cortical functions with high spatial resolution. Here, we report on detailed TMS language mapping of Broca's region in 12 healthy participants. The test protocol with an object naming task was adapted for high-resolution and semi-quantitative mapping of TMS-induced effects on speech and language performance...
November 7, 2017: Brain Structure & Function
https://www.readbyqxmd.com/read/29106999/functional-connectivity-in-the-dorsal-stream-and-between-bilateral-auditory-related-cortical-areas-differentially-contribute-to-speech-decoding-depending-on-spectro-temporal-signal-integrity-and-performance
#3
Stefan Elmer, Jürg Kühnis, Piyush Rauch, Seyed Abolfazl Valizadeh, Lutz Jäncke
Speech processing relies on the interdependence between auditory perception, sensorimotor integration, and verbal memory functions. Functional and structural connectivity between bilateral auditory-related cortical areas (ARCAs) facilitates spectro-temporal analyses, whereas the dynamic interplay between ARCAs and Broca's area (i.e., dorsal pathway) contributes to verbal memory functions, articulation, and sound-to-motor mapping. However, it remains unclear whether these two neural circuits are preferentially driven by spectral or temporal acoustic information, and whether their recruitment is predictive of speech perception performance and learning...
October 30, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/29093069/predicting-clinical-decline-in-progressive-agrammatic-aphasia-and-apraxia-of-speech
#4
Jennifer L Whitwell, Stephen D Weigand, Joseph R Duffy, Heather M Clark, Edythe A Strand, Mary M Machulda, Anthony J Spychalla, Matthew L Senjem, Clifford R Jack, Keith A Josephs
OBJECTIVE: To determine whether baseline clinical and MRI features predict rate of clinical decline in patients with progressive apraxia of speech (AOS). METHODS: Thirty-four patients with progressive AOS, with AOS either in isolation or in the presence of agrammatic aphasia, were followed up longitudinally for up to 4 visits, with clinical testing and MRI at each visit. Linear mixed-effects regression models including all visits (n = 94) were used to assess baseline clinical and MRI variables that predict rate of worsening of aphasia, motor speech, parkinsonism, and behavior...
November 1, 2017: Neurology
https://www.readbyqxmd.com/read/29072115/fearful-asymmetry-bouillaud-dax-broca-and-the-localization-of-language-paris-1825-1879
#5
Michael C Corballis
No abstract text is available yet for this article.
October 26, 2017: Laterality
https://www.readbyqxmd.com/read/29064339/the-neurobiology-of-agrammatic-sentence-comprehension-a-lesion-study
#6
Corianne Rogalsky, Arianna N LaCroix, Kuan-Hua Chen, Steven W Anderson, Hanna Damasio, Tracy Love, Gregory Hickok
Broca's area has long been implicated in sentence comprehension. Damage to this region is thought to be the central source of "agrammatic comprehension" in which performance is substantially worse (and near chance) on sentences with noncanonical word orders compared with canonical word order sentences (in English). This claim is supported by functional neuroimaging studies demonstrating greater activation in Broca's area for noncanonical versus canonical sentences. However, functional neuroimaging studies also have frequently implicated the anterior temporal lobe (ATL) in sentence processing more broadly, and recent lesion-symptom mapping studies have implicated the ATL and mid temporal regions in agrammatic comprehension...
October 24, 2017: Journal of Cognitive Neuroscience
https://www.readbyqxmd.com/read/29061490/electrophysiology-of-prosodic-and-lexical-semantic-processing-during-sentence-comprehension-in-aphasia
#7
Shannon M Sheppard, Tracy Love, Katherine J Midgley, Phillip J Holcomb, Lewis P Shapiro
Event-related potentials (ERPs) were used to examine how individuals with aphasia and a group of age-matched controls use prosody and thematic fit information in sentences containing temporary syntactic ambiguities. Two groups of individuals with aphasia were investigated; those demonstrating relatively good sentence comprehension whose primary language difficulty is anomia (Individuals with Anomic Aphasia (IWAA)), and those who demonstrate impaired sentence comprehension whose primary diagnosis is Broca's aphasia (Individuals with Broca's Aphasia (IWBA))...
October 20, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/29033772/intraparenchymal-hemorrhage-due-to-brain-metastasis-of-hepatocellular-carcinoma
#8
Rafael Sartori Balbinot, Ana Laura Facco Muscope, Mateus Dal Castel, Silvana Sartori Balbinot, Raul Angelo Balbinot, Jonathan Soldera
Although extrahepatic metastases from hepatocellular carcinoma (HCC) are present in only 5-15% of cases, they are certainly factors associated with poor prognosis. The main sites include lung, lymph nodes, bones, and adrenal glands, in descending order. Metastasis in the central nervous system is extremely rare, and the incidences vary from 0.6 to 1.7%. We report a case of a 54-year-old man previously diagnosed with alcohol-induced cirrhosis of the liver and HCC. The patient was admitted presenting progressive left hemiparesis and headache which started 2 days earlier, with no history of cranioencephalic trauma...
September 2017: Case Reports in Gastroenterology
https://www.readbyqxmd.com/read/28989215/the-curious-case-of-processing-unaccusative-verbs-in-aphasia
#9
Natalie Sullivan, Matthew Walenski, Tracy Love, Lewis P Shapiro
BACKGROUND: Individuals with agrammatic Broca's aphasia (IWBA) exhibit a delay in lexical activation in S-V-O word order sentences and delayed lexical reactivation in sentences that contain syntactic dependencies. This pattern is in contrast to neurologically unimpaired individuals who immediately evince lexical reactivation at the gap in sentences that contain syntactic dependencies. However, in the case of sentences that contain unaccusative verbs, neurologically unimpaired individuals also exhibit a delay in lexical reactivation...
2017: Aphasiology
https://www.readbyqxmd.com/read/28984608/damage-to-the-frontal-aslant-tract-accounts-for-visuo-constructive-deficits-in-alzheimer-s-disease
#10
Laura Serra, Giulia Bechi Gabrielli, Elisa Tuzzi, Barbara Spanò, Giovanni Giulietti, Virginia Failoni, Camillo Marra, Carlo Caltagirone, Giacomo Koch, Mara Cercignani, Marco Bozzali
The frontal aslant tract (FAT) has been described as a bundle connecting the Broca's area to the supplementary motor area (SMA) and the pre-SMA in both hemispheres. The functional properties of this tract and its role in degenerative dementia, such as Alzheimer's disease (AD), still need to be fully clarified. The aim of this study was to explore the microstructural integrity of the FAT in patients with AD and its potential relationship with cognitive functioning. Twenty-three patients with AD and 25 healthy subjects (HS) were enrolled...
2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28983238/unique-neural-characteristics-of-atypical-lateralization-of-language-in-healthy-individuals
#11
Szymon P Biduła, Łukasz Przybylski, Mikołaj A Pawlak, Gregory Króliczak
Using functional magnetic resonance imaging (fMRI) in 63 healthy participants, including left-handed and ambidextrous individuals, we tested how atypical lateralization of language-i. e., bilateral or right hemispheric language representation-differs from the typical left-hemisphere dominance. Although regardless of their handedness, all 11 participants from the atypical group engaged classical language centers, i.e., Broca's and Wernicke's areas, the right-hemisphere components of the default mode network (DMN), including the angular gyrus and middle temporal gyrus, were also critically involved during the verbal fluency task...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28979196/speed-and-oscillations-medial-septum-integration-of-attention-and-navigation
#12
REVIEW
Marian Tsanov
Several cortical and diencephalic limbic brain regions incorporate neurons that fire in correlation with the speed of whole-body motion, also known as linear velocity. Besides the field mapping and head-directional information, the linear velocity is among the major signals that guide animal's spatial navigation. Large neuronal populations in the same limbic regions oscillate with theta rhythm during spatial navigation or attention episodes; and the frequency of theta also correlates with linear velocity. A functional similarity between these brain areas is that their inactivation impairs the ability to form new spatial memories; whereas an anatomical similarity is that they all receive projections from medial septum-diagonal band of Broca complex...
2017: Frontiers in Systems Neuroscience
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/28959509/management-of-tiny-meningiomas-to-resect-or-not-resect
#14
Julia R Schneider, Kay O Kulason, Tim White, Bidyut Pramanik, Shamik Chakraborty, Linda Heier, Ashley E Ray, Todd A Anderson, Derek J Chong, John Boockvar
Meningiomas are most often benign primary intracranial tumors that are frequently found incidentally on imaging. Larger sized meningiomas may present with symptoms such as seizures and headaches. Smaller meningiomas are commonly asymptomatic and usually observed with serial imaging. We present two female patients, both of whom were found to have very small left frontal meningiomas that marginated Broca's area. The first patient in this case series experienced episodes resembling seizures which consisted of weakness, vision loss, and slurred speech, as well as subtle language dysfunction in her day-to-day conversations...
July 25, 2017: Curēus
https://www.readbyqxmd.com/read/28940045/a-neuronal-retuning-hypothesis-of-sentence-specificity-in-broca-s-area
#15
REVIEW
William G Matchin
It is clear that the left inferior frontal gyrus (LIFG) contributes in some fashion to sentence processing. While neuroimaging and neuropsychological evidence support a domain-general working memory function, recent neuroimaging data show that particular subregions of the LIFG, particularly the pars triangularis (pTri), show selective activation for sentences relative to verbal working memory and cognitive control tasks. These data suggest a language-specific function rather than a domain-general one. To resolve this apparent conflict, I propose separating claims of domain-generality and specificity independently for computations and representations-a given brain region may respond to a specific representation while performing a general computation over that representation, one shared with other systems...
September 22, 2017: Psychonomic Bulletin & Review
https://www.readbyqxmd.com/read/28924564/signal-processing-of-functional-nirs-data-acquired-during-overt-speaking
#16
Xian Zhang, Jack Adam Noah, Swethasri Dravida, Joy Hirsch
Functional near-infrared spectroscopy (fNIRS) offers an advantage over traditional functional imaging methods [such as functional magnetic resonance imaging (fMRI)] by allowing participants to move and speak relatively freely. However, neuroimaging while actively speaking has proven to be particularly challenging due to the systemic artifacts that tend to be located in the critical brain areas. To overcome these limitations and enhance the utility of fNIRS, we describe methods for investigating cortical activity during spoken language tasks through refinement of deoxyhemoglobin (deoxyHb) signals with principal component analysis (PCA) spatial filtering to remove global components...
October 2017: Neurophotonics
https://www.readbyqxmd.com/read/28904449/james-wenceslaus-papez-his-circuit-and-emotion
#17
Kalyan B Bhattacharyya
James Papez worked on the anatomical substrates of emotion and described a circuit, mainly composed of the hippocampus, thalamus and cingulum, and published his observations in 1937. However, such an idea existed before him, as evidenced by the rudimentary indications from Paul Broca, and Paul MacLean added some other structures like, septum, amygdala, and hypothalamus in its ambit and called it the limbic system. Paul Ivan Yakovlev, proposed a circuit which also referred to orbitofrontal, insular, anterior temporal lobe, and other nuclei of thalamus...
July 2017: Annals of Indian Academy of Neurology
https://www.readbyqxmd.com/read/28882421/-18-f-fdg-pet-hypometabolism-patterns-reflect-clinical-heterogeneity-in-sporadic-forms-of-early-onset-alzheimer-s-disease
#18
Matthieu Vanhoutte, Franck Semah, Adeline Rollin Sillaire, Alice Jaillard, Grégory Petyt, Grégory Kuchcinski, Aurélien Maureille, Xavier Delbeuck, Rachid Fahmi, Florence Pasquier, Renaud Lopes
Until now, hypometabolic patterns and their correlations with neuropsychological performance have not been assessed as a function of the various presentations of sporadic early-onset Alzheimer's disease (EOAD). Here, we processed and analyzed the patients' metabolic maps at the vertex and voxel levels by using a nonparametric, permutation method that also regressed out the effects of cortical thickness and gray matter volume, respectively. The hypometabolism patterns in several areas of the brain were significantly correlated with the clinical manifestations...
November 2017: Neurobiology of Aging
https://www.readbyqxmd.com/read/28875140/recording-natural-head-position-using-an-accelerometer-and-reconstruction-from-computed-tomographic-images
#19
Il Kyung Park, Keun Young Lee, Yeong Kon Jeong, Rae Hyong Kim, Dae Gun Kwon, Sunghee Yeon, Kyung-Hwan Kwon
OBJECTIVES: The concept of natural head position (NHP) was first introduced by Broca in 1862, and was described as a person's stable physiologic position "when a man is standing and his visual axis is horizontal." NHP has been used routinely for clinical examination; however, a patient's head position is random during cone-beam computed tomography (CBCT) acquisition. To solve this problem, we developed an accelerometer to record patients' NHP and reproduce them for CBCT images. In this study, we also tested the accuracy and reproducibility of our accelerometer...
August 2017: Journal of the Korean Association of Oral and Maxillofacial Surgeons
https://www.readbyqxmd.com/read/28867997/autism-spectrum-disorder-related-functional-connectivity-changes-in-the-language-network-in-children-adolescents-and-adults
#20
Yubu Lee, Bo-Yong Park, Oliver James, Seong-Gi Kim, Hyunjin Park
Autism spectrum disorder (ASD) is a neurodevelopmental disability with global implication. Altered brain connectivity in the language network has frequently been reported in ASD patients using task-based functional magnetic resonance imaging (fMRI) compared to typically developing (TD) participants. Most of these studies have focused on a specific age group or mixed age groups with ASD. In the current study, we investigated age-related changes in functional connectivity related measure, degree centrality (DC), in the language network across three age groups with ASD (113 children, 113 adolescents and 103 adults) using resting-state fMRI data collected from the autism brain imaging data exchange repository...
2017: Frontiers in Human Neuroscience
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