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Functional neuroimaging

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https://www.readbyqxmd.com/read/27906518/functional-development-of-the-brain-s-face-processing-system
#1
REVIEW
Frank Haist, Gizelle Anzures
In the first 20 years of life, the human brain undergoes tremendous growth in size, weight, and synaptic connectedness. Over the same time period, a person achieves remarkable transformations in perception, thought, and behavior. One important area of development is face processing ability, or the ability to quickly and accurately extract extensive information about a person's identity, emotional state, attractiveness, intention, and numerous other types of information that are crucial to everyday social interaction and communication...
December 1, 2016: Wiley Interdisciplinary Reviews. Cognitive Science
https://www.readbyqxmd.com/read/27906499/individual-differences-in-human-brain-development
#2
REVIEW
Timothy T Brown
This article discusses recent scientific advances in the study of individual differences in human brain development. Focusing on structural neuroimaging measures of brain morphology and tissue properties, two kinds of variability are related and explored: differences across individuals of the same age and differences across age as a result of development. A recent multidimensional modeling study is explained, which was able to use brain measures to predict an individual's chronological age within about one year on average, in children, adolescents, and young adults between 3 and 20 years old...
December 1, 2016: Wiley Interdisciplinary Reviews. Cognitive Science
https://www.readbyqxmd.com/read/27904591/brain-regions-involved-in-swallowing-evidence-from-stroke-patients-in-a-cross-sectional-study
#3
Shiva Ebrahimian Dehaghani, Fariba Yadegari, Ali Asgari, Ahmad Chitsaz, Mehdi Karami
BACKGROUND: Limited data available about the mechanisms of dysphagia and areas involving swallow after brain damage; accordingly it is hard to predict which cases are more likely to develop swallowing dysfunction based on the neuroimaging. The aim of this study was to investigate the relationship between brain lesions and dysphagia in a sample of acute conscious stroke patients. MATERIALS AND METHODS: In a cross-sectional study, 113 acute conscious stroke patients (69 male mean [standard deviation (SD)] age 64...
2016: Journal of Research in Medical Sciences: the Official Journal of Isfahan University of Medical Sciences
https://www.readbyqxmd.com/read/27903817/effects-of-orthostatic-hypotension-on-cognition-in-parkinson-disease
#4
Justin Centi, Roy Freeman, Christopher H Gibbons, Sandy Neargarder, Alexander O Canova, Alice Cronin-Golomb
OBJECTIVE: To investigate the relation between orthostatic hypotension (OH) and posture-mediated cognitive impairment in Parkinson disease (PD) using a cross-sectional and within-group design. METHODS: Individuals without dementia with idiopathic PD included 18 with OH (PDOH) and 19 without OH; 18 control participants were also included. Neuropsychological tests were conducted in supine and upright-tilted positions. Blood pressure was assessed in each posture. RESULTS: The PD groups performed similarly while supine, demonstrating executive dysfunction in sustained attention and response inhibition, and reduced semantic fluency and verbal memory (encoding and retention)...
November 30, 2016: Neurology
https://www.readbyqxmd.com/read/27903441/optimising-experimental-design-for-meg-resting-state-functional-connectivity-measurement
#5
Lucrezia Liuzzi, Lauren E Gascoyne, Prejaas K Tewarie, Eleanor L Barratt, Elena Boto, Matthew J Brookes
The study of functional connectivity using magnetoencephalography (MEG) is an expanding area of neuroimaging, and adds an extra dimension to the more common assessments made using fMRI. The importance of such metrics is growing, with recent demonstrations of their utility in clinical research, however previous reports suggest that whilst group level resting state connectivity is robust, single session recordings lack repeatability. Such robustness is critical if MEG measures in individual subjects are to prove clinically valuable...
November 26, 2016: NeuroImage
https://www.readbyqxmd.com/read/27903187/stereotactic-diffusion-tensor-imaging-tractography-for-gamma-knife-radiosurgery
#6
Cormac G Gavin, H Ian Sabin
OBJECTIVE The integration of modern neuroimaging into treatment planning has increased the therapeutic potential and safety of stereotactic radiosurgery. The authors report their method of integrating stereotactic diffusion tensor imaging (DTI) tractography into conventional treatment planning for Gamma Knife radiosurgery (GKRS). The aim of this study was to demonstrate the feasibility of this technique and to address some of the technical limitations of previously reported techniques. METHODS Twenty patients who underwent GKRS composed the study cohort...
December 2016: Journal of Neurosurgery
https://www.readbyqxmd.com/read/27901100/imaging-analysis-of-parkinson-s-disease-patients-using-spect-and-tractography
#7
Seong-Jin Son, Mansu Kim, Hyunjin Park
Parkinson's disease (PD) is a degenerative disorder that affects the central nervous system. PD-related alterations in structural and functional neuroimaging have not been fully explored. This study explored multi-modal PD neuroimaging and its application for predicting clinical scores on the Movement Disorder Society-sponsored Unified Parkinson's Disease Rating Scale (MDS-UPDRS). Multi-modal imaging that combined (123)I-Ioflupane single-photon emission computed tomography (SPECT) and diffusion tensor imaging (DTI) were adopted to incorporate complementary brain imaging information...
November 30, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27899884/the-inverse-relationship-between-the-microstructural-variability-of-amygdala-prefrontal-pathways-and-trait-anxiety-is-moderated-by-sex
#8
M Justin Kim, Annemarie C Brown, Alison M Mattek, Samantha J Chavez, James M Taylor, Amy L Palmer, Yu-Chien Wu, Paul J Whalen
Anxiety impacts the quality of everyday life and may facilitate the development of affective disorders, possibly through concurrent alterations in neural circuitry. Findings from multimodal neuroimaging studies suggest that trait-anxious individuals may have a reduced capacity for efficient communication between the amygdala and the ventral prefrontal cortex (vPFC). A diffusion-weighted imaging protocol with 61 directions was used to identify lateral and medial amygdala-vPFC white matter pathways. The structural integrity of both pathways was inversely correlated with self-reported levels of trait anxiety...
2016: Frontiers in Systems Neuroscience
https://www.readbyqxmd.com/read/27898583/genetic-control-of-postnatal-human-brain-growth
#9
Laura I van Dyck, Eric M Morrow
PURPOSE OF REVIEW: Studies investigating postnatal brain growth disorders inform the biology underlying the development of human brain circuitry. This research is becoming increasingly important for the diagnosis and treatment of childhood neurodevelopmental disorders, including autism and related disorders. Here, we review recent research on typical and abnormal postnatal brain growth and examine potential biological mechanisms. RECENT FINDINGS: Clinically, brain growth disorders are heralded by diverging head size for a given age and sex, but are more precisely characterized by brain imaging, post-mortem analysis, and animal model studies...
November 24, 2016: Current Opinion in Neurology
https://www.readbyqxmd.com/read/27896939/a-multimodal-study-of-impulsivity-and-body-weight-integrating-behavioral-cognitive-and-neuroimaging-approaches
#10
Francesca M Filbey, Uma S Yezhuvath
OBJECTIVE: Dimensions of impulsivity are related to obesity. Accordingly, characterization of impulsivity in individuals with overweight and obesity holds promise for more targeted and effective intervention. METHODS: Forty-five individuals (13 males, mean age = 32.6, mean body mass index [BMI] = 30.7) were recruited to determine the role of impulsivity in elevated body weight by evaluating: (1) trait impulsivity via impulsive sensation-seeking scale (ImpSS), (2) state impulsivity via continuous performance test, and (3) activation and integration of brain cognitive control regions via functional magnetic resonance imaging during a response inhibition task (i...
November 29, 2016: Obesity
https://www.readbyqxmd.com/read/27896064/executive-attention-networks-show-altered-relationship-with-default-mode-network-in-pd
#11
Peter Boord, Tara M Madhyastha, Mary K Askren, Thomas J Grabowski
Attention dysfunction is a common but often undiagnosed cognitive impairment in Parkinson's disease that significantly reduces quality of life. We sought to increase understanding of the mechanisms underlying attention dysfunction using functional neuroimaging. Functional MRI was acquired at two repeated sessions in the resting state and during the Attention Network Test, for 25 non-demented subjects with Parkinson's disease and 21 healthy controls. Behavioral and MRI contrasts were calculated for alerting, orienting, and executive control components of attention...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/27895564/neural-systems-underlying-emotional-and-non-emotional-interference-processing-an-ale-meta-analysis-of-functional-neuroimaging-studies
#12
Min Xu, Guiping Xu, Yang Yang
Understanding how the nature of interference might influence the recruitments of the neural systems is considered as the key to understanding cognitive control. Although, interference processing in the emotional domain has recently attracted great interest, the question of whether there are separable neural patterns for emotional and non-emotional interference processing remains open. Here, we performed an activation likelihood estimation meta-analysis of 78 neuroimaging experiments, and examined common and distinct neural systems for emotional and non-emotional interference processing...
2016: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/27895298/effect-of-right-insular-involvement-on-death-and-functional-outcome-after-acute-ischemic-stroke-in-the-ist-3-trial-third-international-stroke-trial
#13
Luciano A Sposato, Geoffrey Cohen, Joanna M Wardlaw, Peter Sandercock, Richard I Lindley, Vladimir Hachinski
BACKGROUND AND PURPOSE: In patients with acute ischemic stroke, whether involvement of the insular cortex influences outcome is controversial. Much of the apparent adverse outcome may relate to such strokes usually being severe. We examined the influence of right and left insular involvement on stroke outcomes among patients from the IST-3 study (Third International Stroke Trial) who had visible ischemic stroke on neuroimaging. METHODS: We used multiple logistic regression to compare outcomes of left versus right insular and noninsular strokes across strata of stroke severity, on death, proportion dead or dependent, and level of disability (ordinalized Oxford Handicap Score) at 6 months, with adjustment for the effects of age, lesion size, and presence of atrial fibrillation...
December 2016: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/27894901/bilingualism-yields-language-specific-plasticity-in-left-hemisphere-s-circuitry-for-learning-to-read-in-young-children
#14
K K Jasińska, M S Berens, I Kovelman, L A Petitto
How does bilingual exposure impact children's neural circuitry for learning to read? Theories of bilingualism suggests that exposure to two languages may yield a functional and neuroanatomical adaptation to support the learning of two languages (Klein et al., 2014). To test the hypothesis that this neural adaptation may vary as a function of structural and orthographic characteristics of bilinguals' two languages, we compared Spanish-English and French-English bilingual children, and English monolingual children, using functional Near Infrared Spectroscopy neuroimaging (fNIRS, ages 6-10, N = 26)...
November 25, 2016: Neuropsychologia
https://www.readbyqxmd.com/read/27894900/neuroimaging-somatosensory-perception-and-masking
#15
Kimford J Meador, Kathleen Pirog Revill, Charles M Epstein, K Sathian, David W Loring, Chris Rorden
The specific cortical and subcortical regions involved in conscious perception and masking are uncertain. This study sought to identify brain areas involved in conscious perception of somatosensory stimuli during a masking task using functional magnetic resonance (fMRI) to contrast perceived vs. non-perceived targets. Electrical trains were delivered to the right index finger for targets and to the left index finger for masks. Target intensities were adjusted to compensate for threshold drift. Sham target trials were given in ~10% of the trials, and target stimuli without masks were delivered in one of the five runs (68 trials/run)...
November 25, 2016: Neuropsychologia
https://www.readbyqxmd.com/read/27893013/proton-chemical-shift-imaging-of-the-brain-in-pediatric-and-adult-developmental-stuttering
#16
Joseph O'Neill, Zhengchao Dong, Ravi Bansal, Iliyan Ivanov, Xuejun Hao, Jay Desai, Elena Pozzi, Bradley S Peterson
Importance: Developmental stuttering is a neuropsychiatric condition of incompletely understood brain origin. Our recent functional magnetic resonance imaging study indicates a possible partial basis of stuttering in circuits enacting self-regulation of motor activity, attention, and emotion. Objective: To further characterize the neurophysiology of stuttering through in vivo assay of neurometabolites in suspect brain regions. Design, Setting, and Participants: Proton chemical shift imaging of the brain was performed in a case-control study of children and adults with and without stuttering...
November 23, 2016: JAMA Psychiatry
https://www.readbyqxmd.com/read/27891073/a-hitchhiker-s-guide-to-functional-magnetic-resonance-imaging
#17
REVIEW
José M Soares, Ricardo Magalhães, Pedro S Moreira, Alexandre Sousa, Edward Ganz, Adriana Sampaio, Victor Alves, Paulo Marques, Nuno Sousa
Functional Magnetic Resonance Imaging (fMRI) studies have become increasingly popular both with clinicians and researchers as they are capable of providing unique insights into brain functions. However, multiple technical considerations (ranging from specifics of paradigm design to imaging artifacts, complex protocol definition, and multitude of processing and methods of analysis, as well as intrinsic methodological limitations) must be considered and addressed in order to optimize fMRI analysis and to arrive at the most accurate and grounded interpretation of the data...
2016: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/27890810/interaction-of-language-auditory-and-memory-brain-networks-in-auditory-verbal-hallucinations
#18
REVIEW
Branislava Ćurčić-Blake, Judith Ford, Daniela Hubl, Natasza D Orlov, Iris E Sommer, Flavie Waters, Paul Allen, Renaud Jardri, Peter W Woodruff, David Olivier, Christoph Mulert, Todd S Woodward, André Aleman
Auditory verbal hallucinations (AVH) occur in psychotic disorders, but also as a symptom of other conditions and even in healthy people. Several current theories on the origin of AVH converge, with neuroimaging studies suggesting that the language, auditory and memory/limbic networks are of particular relevance. However, reconciliation of these theories with experimental evidence is missing. We review 50 studies investigating functional (EEG and fMRI) and anatomic (diffusion tensor imaging) connectivity in these networks, and explore the evidence supporting abnormal connectivity in these networks associated with AVH...
November 24, 2016: Progress in Neurobiology
https://www.readbyqxmd.com/read/27890803/neural-signatures-of-phonological-deficits-in-chinese-developmental-dyslexia
#19
Fan Cao, Xin Yan, Zhao Wang, Yanni Liu, Jin Wang, Gregory J Spray, Yuan Deng
There has been debate on whether phonological deficits explain reading difficulty in Chinese, since Chinese is a logographic language which does not employ grapheme-phoneme-correspondence rules and remote memorization seems to be the main method to acquire reading. In the current study, we present neuroimaging evidence that the phonological deficit is also a signature of Chinese dyslexia. Specifically, we found that Chinese children with dyslexia (DD) showed reduced brain activation in the left dorsal inferior frontal gyrus (dIFG) when compared to both age-matched controls (AC) and reading-matched controls (RC) during an auditory rhyming judgment task...
November 23, 2016: NeuroImage
https://www.readbyqxmd.com/read/27889011/limb-amputation-and-other-disability-desires-as-a-medical-condition
#20
REVIEW
Peter Brugger, Markus Christen, Lena Jellestad, Jürgen Hänggi
Some people have a profound dissatisfaction with what is considered an able-bodied state by most others. These individuals desire to be disabled, by conventional standards. In this Review, we integrate research findings about the desire for a major limb amputation or paralysis (xenomelia). Neuropsychological and neuroimaging explorations of xenomelia show functional and structural abnormalities in predominantly right hemisphere cortical circuits of higher-order bodily representation, including affective and sexual aspects of corporeal awareness...
December 2016: Lancet Psychiatry
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