keyword
MENU ▼
Read by QxMD icon Read
search

Premotor

keyword
https://www.readbyqxmd.com/read/28735100/attention-modulates-specific-motor-cortical-circuits-recruited-by-transcranial-magnetic-stimulation
#1
J L Mirdamadi, L Y Suzuki, S K Meehan
Skilled performance and acquisition is dependent upon afferent input to motor cortex. The present study used short-latency afferent inhibition (SAI) to probe how manipulation of sensory afference by attention affects different circuits projecting to pyramidal tract neurons in motor cortex. SAI was assessed in the first dorsal interosseous muscle while participants performed a low or high attention demanding visual detection task. SAI was evoked by preceding a suprathreshold transcranial magnetic stimulus with electrical stimulation of the median nerve at the wrist...
July 19, 2017: Neuroscience
https://www.readbyqxmd.com/read/28731517/mental-steps-differential-activation-of-internal-pacemakers-in-motor-imagery-and-in-mental-imitation-of-gait
#2
Lucia Maria Sacheli, Laura Zapparoli, Carlo De Santis, Matteo Preti, Catia Pelosi, Nicola Ursino, Alberto Zerbi, Giuseppe Banfi, Eraldo Paulesu
Gait imagery and gait observation can boost the recovery of locomotion dysfunctions; yet, a neurologically justified rationale for their clinical application is lacking as much as a direct comparison of their neural correlates. Using functional magnetic resonance imaging, we measured the neural correlates of explicit motor imagery of gait during observation of in-motion videos shot in a park with a steady cam (Virtual Walking task). In a 2 × 2 factorial design, we assessed the modulatory effect of gait observation and of foot movement execution on the neural correlates of the Virtual Walking task: in half of the trials, the participants were asked to mentally imitate a human model shown while walking along the same route (mental imitation condition); moreover, for half of all the trials, the participants also performed rhythmic ankle dorsiflexion as a proxy for stepping movements...
July 21, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28721394/interhemispheric-disconnectivity-in-the-sensorimotor-network-in-bipolar-disorder-revealed-by-functional-connectivity-and-diffusion-tensor-imaging-analysis
#3
Takuya Ishida, Tomohiro Donishi, Jun Iwatani, Shinichi Yamada, Shun Takahashi, Satoshi Ukai, Kazuhiro Shinosaki, Masaki Terada, Yoshiki Kaneoke
BACKGROUND: Little is known regarding interhemispheric functional connectivity (FC) abnormalities via the corpus callosum in subjects with bipolar disorder (BD), which might be a key pathophysiological basis of emotional processing alterations in BD. METHODS: We performed tract-based spatial statistics (TBSS) using diffusion tensor imaging (DTI) in 24 healthy control (HC) and 22 BD subjects. Next, we analyzed the neural networks with independent component analysis (ICA) in 32HC and 25 BD subjects using resting-state functional magnetic resonance imaging...
June 2017: Heliyon
https://www.readbyqxmd.com/read/28713925/the-atrophy-of-white-and-gray-matter-volume-in-patients-with-comitant-strabismus-evidence-from-a-voxel-based-morphometry-study
#4
Jun Ouyang, Lu Yang, Xin Huang, Yu-Lin Zhong, Pei-Hong Hu, Ying Zhang, Chong-Gang Pei, Yi Shao
To compare the difference in white matter volume (WMV) and gray matter volume (GMV) between the comitant strabismus (CS) patients and health controls by voxel-based morphometry (VBM) and the relationship with behavioral performance. A total of 20 patients with comitant strabismus (10 males and 10 females), and 20 healthy subjects (10 males and 10 females) with matched age, sex status underwent magnetic resonance examination. The authors analyzed the original 3D T1 brain images using the VBM module. The comitant strabismus groups were compared with the control groups for the GMW and WMV of the entire brain...
September 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28707157/parcellation-of-macaque-cortex-with-anatomical-connectivity-profiles
#5
Jiaojian Wang, Zhentao Zuo, Sangma Xie, Yifan Miao, Yuanye Ma, Xudong Zhao, Tianzi Jiang
The macaque model has been widely used to investigate the brain mechanisms of specific cognitive functions and psychiatric disorders. However, a detailed functional architecture map of the macaque cortex in vivo is still lacking. Here, we aimed to construct a new macaque cortex atlas based on its anatomical connectivity profiles using in vivo diffusion MRI. First, we defined the macaque cortical seed areas using the NeuroMaps atlas. Then, we applied the anatomical connectivity patterns-based parcellation approach to parcellate the macaque cortex into 80 subareas in each hemisphere, which were approximately symmetric between the two hemispheres...
July 13, 2017: Brain Topography
https://www.readbyqxmd.com/read/28687804/on-the-effects-of-multimodal-information-integration-in-multitasking
#6
Ann-Kathrin Stock, Krutika Gohil, René J Huster, Christian Beste
There have recently been considerable advances in our understanding of the neuronal mechanisms underlying multitasking, but the role of multimodal integration for this faculty has remained rather unclear. We examined this issue by comparing different modality combinations in a multitasking (stop-change) paradigm. In-depth neurophysiological analyses of event-related potentials (ERPs) were conducted to complement the obtained behavioral data. Specifically, we applied signal decomposition using second order blind identification (SOBI) to the multi-subject ERP data and source localization...
July 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28687313/two-different-mirror-neuron-networks-the-sensorimotor-hand-and-limbic-face-pathways
#7
REVIEW
P F Ferrari, M Gerbella, G Coudé, S Rozzi
The vast majority of functional studies investigating mirror neurons (MNs) explored their properties in relation to hand actions, and very few investigated how MNs respond to mouth actions or communicative gestures. Since hand and mouth MNs were recorded in two partially overlapping sectors of the ventral precentral cortex of the macaque monkey, there is a general assumption that they share a same neuroanatomical network, with the parietal cortex as a main source of visual information. In the current review, we challenge this perspective and describe the connectivity pattern of mouth MN sector...
July 4, 2017: Neuroscience
https://www.readbyqxmd.com/read/28681747/correlation-of-ubiquitin-c-terminal-hydrolase-and-s100%C3%AE-with-cognitive-deficits-in-young-adults-with-mild-traumatic-brain-injury
#8
Subir Dey, Jagathlal Gangadharan, Akhil Deepika, J Keshav Kumar, Rita Christopher, Shruthi S Ramesh, B Indira Devi, Dhaval P Shukla
OBJECTIVE: To study the acute phase serum biomarkers in patients with mild traumatic brain injury (mTBI) and to correlate them with short term cognitive deficits. MATERIALS AND METHODS: This is a prospective observational study conducted at a tertiary care center for neurotrauma. The participants included patients with mTBI (n = 20) and age, gender, and education-status matched healthy controls (n = 20). In both the groups, the serum concentrations of biomarkers ubiquitin C terminal hydrolase (UCH-L1) and S100 calcium-binding protein B (S100B) were measured...
July 2017: Neurology India
https://www.readbyqxmd.com/read/28680906/neurofeedback-based-functional-near-infrared-spectroscopy-upregulates-motor-cortex-activity-in-imagined-motor-tasks
#9
Pawan Lapborisuth, Xian Zhang, Adam Noah, Joy Hirsch
Neurofeedback is a method for using neural activity displayed on a computer to regulate one's own brain function and has been shown to be a promising technique for training individuals to interact with brain-machine interface applications such as neuroprosthetic limbs. The goal of this study was to develop a user-friendly functional near-infrared spectroscopy (fNIRS)-based neurofeedback system to upregulate neural activity associated with motor imagery, which is frequently used in neuroprosthetic applications...
April 2017: Neurophotonics
https://www.readbyqxmd.com/read/28679601/prospective-clinical-and-dat-spect-imaging-in-premotor-lrrk2-g2019s-associated-parkinson-disease
#10
María Sierra, Isabel Martínez-Rodríguez, Pascual Sánchez-Juan, Isabel González-Aramburu, Mikel Jiménez-Alonso, Antonio Sánchez-Rodríguez, José Berciano, Ignacio Banzo, Jon Infante
OBJECTIVE: To assess the value of baseline clinical and imaging biomarkers in a cohort of asymptomatic LRRK2 G2019S carriers for predicting conversion to Parkinson disease (PD) at 4 years. METHODS: Thirty-two asymptomatic carriers of LRRK2 G2019S mutation underwent baseline and 4-year evaluation including clinical examination (Unified Parkinson's Disease Rating Scale, part III, olfaction University of Pennsylvania Smell Identification Test [UPSIT]) and dopamine transporter (DaT) SPECT ((123)I-ioflupane)...
July 5, 2017: Neurology
https://www.readbyqxmd.com/read/28677224/brain-changes-following-four-weeks-of-unimanual-motor-training-evidence-from-behavior-neural-stimulation-cortical-thickness-and-functional-mri
#11
Martin V Sale, Lee B Reid, Luca Cocchi, Alex M Pagnozzi, Stephen E Rose, Jason B Mattingley
Although different aspects of neuroplasticity can be quantified with behavioral probes, brain stimulation, and brain imaging assessments, no study to date has combined all these approaches into one comprehensive assessment of brain plasticity. Here, 24 healthy right-handed participants practiced a sequence of finger-thumb opposition movements for 10 min each day with their left hand. After 4 weeks, performance for the practiced sequence improved significantly (P < 0.05 FWE) relative to a matched control sequence, with both the left (mean increase: 53...
July 5, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28673716/contribution-of-the-supplementary-motor-area-and-the-cerebellum-to-the-anticipatory-postural-adjustments-and-execution-phases-of-human-gait-initiation
#12
Aliénor Richard, Angèle Van Hamme, Xavier Drevelle, Jean-Louis Golmard, Sabine Meunier, Marie-Laure Welter
Several brain structures including the brainstem, the cerebellum and the frontal cortico-basal ganglia network, with the primary and premotor areas have been shown to participate in the functional organization of gait initiation and postural control in humans, but their respective roles remain poorly understood. The aim of this study was to better understand the role of the supplementary motor area (SMA) and posterior cerebellum in the gait initiation process. Gait initiation parameters were recorded in 22 controls both before and after continuous theta burst transcranial stimulation (cTBS) of the SMA and cerebellum, and were compared to sham stimulation, using a randomized double-blind design study...
July 1, 2017: Neuroscience
https://www.readbyqxmd.com/read/28668221/human-neuroimaging-reveals-the-subcomponents-of-grasping-reaching-and-pointing-actions
#13
Cristiana Cavina-Pratesi, Jason D Connolly, Simona Monaco, Teresa D Figley, A David Milner, Thomas Schenk, Jody C Culham
Although the neural underpinnings of visually guided grasping and reaching have been well delineated within lateral and medial fronto-parietal networks (respectively), the contributions of subcomponents of visuomotor actions have not been explored in detail. Using careful subtraction logic, here we investigated which aspects of grasping, reaching, and pointing movements drive activation across key areas within visuomotor networks implicated in hand actions. For grasping tasks, we find activation differences based on the precision required (fine > coarse grip: anterior intraparietal sulcus, aIPS), the requirement to lift the object (grip + lift > grip: aIPS; dorsal premotor cortex, PMd; and supplementary motor area, SMA), and the number of digits employed (3-/5- vs...
June 6, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/28666147/sudden-unexpected-death-in-early-parkinson-s-disease-neurogenic-or-cardiac-death
#14
Naoki Nishida, Koji Yoshida, Yukiko Hata
We present two cases of sudden unexpected death (SUD) in elderly individuals in whom autopsy unexpectedly showed Lewy pathology, a hallmark of Parkinson's disease. Both individuals were 68-year-old men who were found dead in their homes without lethal trauma or poisoning. Inquests into their deaths suggested that nonmotor cardiovascular signs of Parkinson's disease might have appeared just before their deaths, although few typical motor signs were present. Autopsy showed Lewy pathology in the heart and peripheral autonomic nervous system in addition to lesser involvement of the brainstem that was consistent with Braak stage 3...
June 15, 2017: Cardiovascular Pathology: the Official Journal of the Society for Cardiovascular Pathology
https://www.readbyqxmd.com/read/28654656/developmental-trajectory-of-the-corpus-callosum-from-infancy-to-the-juvenile-stage-comparative-mri-between-chimpanzees-and-humans
#15
Tomoko Sakai, Akichika Mikami, Juri Suzuki, Takako Miyabe-Nishiwaki, Mie Matsui, Masaki Tomonaga, Yuzuru Hamada, Tetsuro Matsuzawa, Hideyuki Okano, Kenichi Oishi
How brains develop during early life is one of the most important topics in neuroscience because it underpins the neuronal functions that mature during this period. A comparison of the neurodevelopmental patterns among humans and nonhuman primates is essential to infer evolutional changes in neuroanatomy that account for higher-order brain functions, especially those specific to humans. The corpus callosum (CC) is the major white matter bundle that connects the cerebral hemispheres, and therefore, relates to a wide variety of neuronal functions...
2017: PloS One
https://www.readbyqxmd.com/read/28649612/disentangling-the-neural-correlates-of-corticobasal-syndrome-and-corticobasal-degeneration-with-systematic-and-quantitative-ale-meta-analyses
#16
Franziska Albrecht, Sandrine Bisenius, Rodrigo Morales Schaack, Jane Neumann, Matthias L Schroeter
Corticobasal degeneration is a scarce neurodegenerative disease, which can only be confirmed by histopathological examination. Reported to be associated with various clinical syndromes, its classical clinical phenotype is corticobasal syndrome. Due to the rareness of corticobasal syndrome/corticobasal degeneration and low numbers of patients included in single studies, meta-analyses are particularly suited to disentangle features of the clinical syndrome and histopathology. Using PubMed, we identified 11 magnetic resonance imaging studies measuring atrophy in 22 independent cohorts with 200 patients contrasted to 318 healthy controls...
2017: NPJ Parkinson's Disease
https://www.readbyqxmd.com/read/28647390/neural-synergies-for-controlling-reach-and-grasp-movement-in-macaques
#17
Yaoyao Hao, Shaomin Zhang, Qiaosheng Zhang, Guanglin Li, Weidong Chen, Xiaoxiang Zheng
It has been suggested that the brain adopts a simplified strategy to coordinate a large number of degrees of freedom in motor control. Synergies have been proposed as a strategy to produce movements by recruitment of a small number of fixed modular patterns. However, there is no direct support for a synergistic organization of the brain itself. In this study, we recorded neural activities from the dorsal premotor cortex (PMd) of monkeys trained to reach and grasp differently shaped objects (grasping task) or the same object in different positions (reaching task)...
June 22, 2017: Neuroscience
https://www.readbyqxmd.com/read/28644969/premotor-symptoms-and-the-risk-of-parkinson-s-disease-a-case-control-study-in-mexican-population
#18
Mayela Rodríguez-Violante, Adib Jorge de Saráchaga, Amin Cervantes-Arriaga, Ned Merari Davila-Avila, Edith Carreón-Bautista, Ingrid Estrada-Bellmann, Guillermo Parra-López, Diego Cruz-Fino, Francisco Pascasio-Astudillo
OBJECTIVES: To assess the prevalence of pre-motor symptoms and estimate the risk for developing Parkinson's disease in Mexican population. PATIENTS AND METHODS: A case-control study was carried out with consecutive subjects with Parkinson's disease from two different referral centers in Mexico. Gender- and age-matched controls were randomly selected from the participating hospitals. All subjects were assessed using a structured questionnaire for the assessment of pre-motor symptoms (hyposmia, depression, anxiety, constipation, and sleep disorders)...
June 15, 2017: Clinical Neurology and Neurosurgery
https://www.readbyqxmd.com/read/28644072/clinicopathological-and-imaging-features-of-lipoastrocytoma-case-report
#19
Laxminadh Sivaraju, Saritha Aryan, Nandita Ghosal, Alangar S Hegde
Lipidized tumors of the central nervous system are very uncommon, with only a few cases described. We report a case of a 25-year-old woman with a tumor involving the left premotor area. She underwent gross total excision. Histologically, the tumor was composed of glial fibrillary acidic protein-positive glial cells with areas of lipidization. A diagnosis of lipoastrocytoma was rendered. At three-year follow-up she was doing well, supporting the presumed favorable prognosis of these uncommon tumors. Absence of xanthochromic appearance, mitotic activity, necrosis and poor reticulin activity are the differentiating features from the pleomorphic xanthoastrocytoma...
January 1, 2017: Neuroradiology Journal
https://www.readbyqxmd.com/read/28642548/hemodynamics-of-speech-production-an-fnirs-investigation-of-children-who-stutter
#20
B Walsh, F Tian, J A Tourville, M A Yücel, T Kuczek, A J Bostian
Stuttering affects nearly 1% of the population worldwide and often has life-altering negative consequences, including poorer mental health and emotional well-being, and reduced educational and employment achievements. Over two decades of neuroimaging research reveals clear anatomical and physiological differences in the speech neural networks of adults who stutter. However, there have been few neurophysiological investigations of speech production in children who stutter. Using functional near-infrared spectroscopy (fNIRS), we examined hemodynamic responses over neural regions integral to fluent speech production including inferior frontal gyrus, premotor cortex, and superior temporal gyrus during a picture description task...
June 22, 2017: Scientific Reports
keyword
keyword
64011
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"