keyword
MENU ▼
Read by QxMD icon Read
search

functional fMRI

keyword
https://www.readbyqxmd.com/read/28432077/aerobic-exercise-promotes-executive-functions-and-impacts-functional-neural-activity-among-older-adults-with-vascular-cognitive-impairment
#1
Chun Liang Hsu, John R Best, Jennifer C Davis, Lindsay S Nagamatsu, Shirley Wang, Lara A Boyd, Gy Robin Hsiung, Michelle W Voss, Janice Jennifer Eng, Teresa Liu-Ambrose
BACKGROUND: Vascular cognitive impairment (VCI) results from cerebrovascular disease, and worldwide, it is the second most common type of cognitive dysfunction. While targeted aerobic training is a promising approach to delay the progression of VCI by reducing cardiometabolic risk factors, few randomised controlled trials to date have specifically assessed the efficacy of aerobic training on cognitive and brain outcomes in this group at risk for functional decline. AIM: To examine the effect of moderate-intensity aerobic training on executive functions and functional neural activity among older adults with mild subcortical ischaemic VCI (SIVCI)...
April 21, 2017: British Journal of Sports Medicine
https://www.readbyqxmd.com/read/28431740/getting-a-grip-on-reality-grasping-movements-directed-to-real-objects-and-images-rely-on-dissociable-neural-representations
#2
Erez Freud, Scott N Macdonald, Juan Chen, Derek J Quinlan, Melvyn A Goodale, Jody C Culham
In the current era of touchscreen technology, humans commonly execute visually guided actions directed to two-dimensional (2D) images of objects. Although real, three-dimensional (3D), objects and images of the same objects share high degree of visual similarity, they differ fundamentally in the actions that can be performed on them. Indeed, previous behavioral studies have suggested that simulated grasping of images relies on different representations than actual grasping of real 3D objects. Yet the neural underpinnings of this phenomena have not been investigated...
March 18, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/28429498/separate-neural-systems-for-behavioral-change-and-for-emotional-responses-to-failure-during-behavioral-inhibition
#3
Wanlu Deng, Edmund T Rolls, Xiaoxi Ji, Trevor W Robbins, Tobias Banaschewski, Arun L W Bokde, Uli Bromberg, Christian Buechel, Sylvane Desrivières, Patricia Conrod, Herta Flor, Vincent Frouin, Juergen Gallinat, Hugh Garavan, Penny Gowland, Andreas Heinz, Bernd Ittermann, Jean-Luc Martinot, Herve Lemaitre, Frauke Nees, Dimitri Papadopoulos Orfanos, Luise Poustka, Michael N Smolka, Henrik Walter, Robert Whelan, Gunter Schumann, Jianfeng Feng
To analyze the involvement of different brain regions in behavioral inhibition and impulsiveness, differences in activation were investigated in fMRI data from a response inhibition task, the stop-signal task, in 1709 participants. First, areas activated more in stop-success (SS) than stop-failure (SF) included the lateral orbitofrontal cortex (OFC) extending into the inferior frontal gyrus (ventrolateral prefrontal cortex, BA 47/12), and the dorsolateral prefrontal cortex (DLPFC). Second, the anterior cingulate and anterior insula (AI) were activated more on failure trials, specifically in SF versus SS...
April 21, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28429068/nicotine-deprivation-elevates-neural-representation-of-smoking-related-cues-in-object-sensitive-visual-cortex-a-proof-of-concept-study
#4
Anne Havermans, Onno C P van Schayck, Eric F P M Vuurman, Wim J Riedel, Job van den Hurk
OBJECTIVE: In the current study, we use functional magnetic resonance imaging (fMRI) and multi-voxel pattern analysis (MVPA) to investigate whether tobacco addiction biases basic visual processing in favour of smoking-related images. We hypothesize that the neural representation of smoking-related stimuli in the lateral occipital complex (LOC) is elevated after a period of nicotine deprivation compared to a satiated state, but that this is not the case for object categories unrelated to smoking...
April 21, 2017: Psychopharmacology
https://www.readbyqxmd.com/read/28428208/resting-state-seed-based-analysis-an-alternative-to-task-based-language-fmri-and-its-laterality-index
#5
K A Smitha, K M Arun, P G Rajesh, B Thomas, C Kesavadas
BACKGROUND AND PURPOSE: Language is a cardinal function that makes human unique. Preservation of language function poses a great challenge for surgeons during resection. The aim of the study was to assess the efficacy of resting-state fMRI in the lateralization of language function in healthy subjects to permit its further testing in patients who are unable to perform task-based fMRI. MATERIALS AND METHODS: Eighteen healthy right-handed volunteers were prospectively evaluated with resting-state fMRI and task-based fMRI to assess language networks...
April 20, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28427018/left-or-right-lateralizing-temporal-lobe-epilepsy-by-dynamic-amygdala-fmri
#6
Victoria Ives-Deliperi, James Thomas Butler, Hennric Jokeit
OBJECTIVES: In this case series, the findings of 85 functional MRI studies employing a dynamic fearful face paradigm are reported. Previous findings have shown the paradigm to generate bilateral amygdala activations in healthy subjects and unilateral activations in patients with MTLE, in the contralateral hemisphere to seizure origin. Such findings suggest ipsilateral limbic pathology and offer collateral evidence in lateralizing MTLE. METHODS: The series includes 60 patients with TLE, 12 patients with extra-temporal lobe epilepsy, and 13 healthy controls...
April 17, 2017: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/28426553/greater-fear-of-visceral-pain-contributes-to-differences-between-visceral-and-somatic-pain-in-healthy-women
#7
Laura Ricarda Koenen, Adriane Icenhour, Katarina Forkmann, Annika Pasler, Nina Theysohn, Michael Forsting, Ulrike Bingel, Sigrid Elsenbruch
This functional magnetic resonance imaging (fMRI) study addressed similarities and differences in behavioral and neural responses to experimental visceral compared to somatic pain stimuli and explored the contribution of fear of pain to differences between pain modalities. In N=22 healthy women, blood oxygen level-dependent (BOLD) responses to rectal distensions and cutaneous heat stimuli matched for perceived pain intensity. Fear of pain and pain unpleasantness were assessed before and after scanning. Visceral pain was more fear-evoking, more unpleasant, and trial-by-trial intensity ratings failed to habituate across trials (all interactions modality X time/trial: p<...
April 18, 2017: Pain
https://www.readbyqxmd.com/read/28426552/altered-neural-responses-to-heat-pain-in-drug-na%C3%A3-ve-patients-with-parkinson-s-disease
#8
Katarina Forkmann, Wiebke Grashorn, Katharina Schmidt, Odette Fründt, Carsten Buhmann, Ulrike Bingel
Pain is a frequent but still neglected non-motor symptom of Parkinson's disease (PD). However, neural mechanisms underlying pain in PD are poorly understood. Here we explored whether the high prevalence of pain in PD might be related to dysfunctional descending pain control. Using fMRI we explored neural responses during the anticipation and processing of heat pain in 21 PD patients (Hoehn&Yahr I-III) and 23 healthy controls (HC). PD patients were naïve to dopaminergic medication in order to avoid confounding drug effects...
April 18, 2017: Pain
https://www.readbyqxmd.com/read/28424611/modafinil-induced-changes-in-functional-connectivity-in-the-cortex-and-cerebellum-of-healthy-elderly-subjects
#9
Miriam Punzi, Tommaso Gili, Laura Petrosini, Carlo Caltagirone, Gianfranco Spalletta, Stefano L Sensi
In the past few years, cognitive enhancing drugs (CEDs) have gained growing interest and the focus of investigations aimed at exploring their use to potentiate the cognitive performances of healthy individuals. Most of this exploratory CED-related research has been performed on young adults. However, CEDs may also help to maintain optimal brain functioning or compensate for subtle and or subclinical deficits associated with brain aging or early-stage dementia. In this study, we assessed effects on resting state brain activity in a group of healthy elderly subjects undergoing acute administration of modafinil, a wakefulness-promoting agent...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28424572/functional-sensitivity-of-2d-simultaneous-multi-slice-echo-planar-imaging-effects-of-acceleration-on-g-factor-and-physiological-noise
#10
Nick Todd, Oliver Josephs, Peter Zeidman, Guillaume Flandin, Steen Moeller, Nikolaus Weiskopf
Accelerated data acquisition with simultaneous multi-slice (SMS) imaging for functional MRI studies leads to interacting and opposing effects that influence the sensitivity to blood oxygen level-dependent (BOLD) signal changes. Image signal to noise ratio (SNR) is decreased with higher SMS acceleration factors and shorter repetition times (TR) due to g-factor noise penalties and saturation of longitudinal magnetization. However, the lower image SNR is counteracted by greater statistical power from more samples per unit time and a higher temporal Nyquist frequency that allows for better removal of spurious non-BOLD high frequency signal content...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28422990/sensory-cortical-response-to-uncertainty-and-low-salience-during-recognition-of-affective-cues-in-musical-intervals
#11
Fernando Bravo, Ian Cross, Emmanuel Andreas Stamatakis, Martin Rohrmeier
Previous neuroimaging studies have shown an increased sensory cortical response (i.e., heightened weight on sensory evidence) under higher levels of predictive uncertainty. The signal enhancement theory proposes that attention improves the quality of the stimulus representation, and therefore reduces uncertainty by increasing the gain of the sensory signal. The present study employed functional magnetic resonance imaging (fMRI) to investigate the neural correlates for ambiguous valence inferences signaled by auditory information within an emotion recognition paradigm...
2017: PloS One
https://www.readbyqxmd.com/read/28422976/reactivation-or-transformation-motor-memory-consolidation-associated-with-cerebral-activation-time-locked-to-sleep-spindles
#12
Stuart Fogel, Genevieve Albouy, Bradley R King, Ovidiu Lungu, Catherine Vien, Arnaud Bore, Basile Pinsard, Habib Benali, Julie Carrier, Julien Doyon
Motor memory consolidation is thought to depend on sleep-dependent reactivation of brain areas recruited during learning. However, up to this point, there has been no direct evidence to support this assertion in humans, and the physiological processes supporting such reactivation are unknown. Here, simultaneous electroencephalographic and functional magnetic resonance imaging (EEG-fMRI) recordings were conducted during post-learning sleep to directly investigate the spindle-related reactivation of a memory trace formed during motor sequence learning (MSL), and its relationship to overnight enhancement in performance (reflecting consolidation)...
2017: PloS One
https://www.readbyqxmd.com/read/28422373/longitudinal-recovery-of-local-neuronal-activity-and-consciousness-level-in-acquired-brain-injury
#13
Qihong Zou, Xuehai Wu, Jin Hu, Weijun Tang, Ying Mao, Jianhong Zhu, Lu Lu, Yao Zhang, Jia-Hong Gao
Decreased brain activity in the default mode network, particularly in the precuneus (PCU), has been consistently shown in acquired brain injury (ABI) patients. However, it is unclear whether resting-state brain activity recovers longitudinally in ABI patients and whether functional activity restoration is associated with improvements in consciousness level. Here, resting-state fMRI data were acquired from 23 ABI patients and 30 age- and gender-matched controls with two longitudinal observations for each participant...
April 19, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28420985/mapping-dorsal-and-ventral-caudate-in-older-adults-method-and-validation
#14
Haiqing Huang, Peter T Nguyen, Nadine A Schwab, Jared J Tanner, Catherine C Price, Mingzhou Ding
The caudate nucleus plays important roles in cognition and affect. Depending on associated connectivity and function, the caudate can be further divided into dorsal and ventral aspects. Dorsal caudate, highly connected to dorsolateral prefrontal cortex (DLPFC), is implicated in executive function and working memory; ventral caudate, more interconnected with the limbic system, is implicated in affective functions such as pain processing. Clinically, certain brain disorders are known to differentially impact dorsal and ventral caudate...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28420981/age-related-difference-in-functional-brain-connectivity-of-mastication
#15
Chia-Shu Lin, Ching-Yi Wu, Shih-Yun Wu, Hsiao-Han Lin, Dong-Hui Cheng, Wen-Liang Lo
The age-related decline in motor function is associated with changes in intrinsic brain signatures. Here, we investigated the functional connectivity (FC) associated with masticatory performance, a clinical index evaluating general masticatory function. Twenty-six older adults (OA) and 26 younger (YA) healthy adults were recruited and assessed using the masticatory performance index (MPI) and resting-state functional magnetic resonance imaging (rs-fMRI). We analyzed the rs-fMRI FC network related to mastication, which was constructed based on 12 bilateral mastication-related brain regions according to the literature...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28420978/resting-state-fmri-reveals-increased-subthalamic-nucleus-and-sensorimotor-cortex-connectivity-in-patients-with-parkinson-s-disease-under-medication
#16
Bo Shen, Yang Gao, Wenbin Zhang, Liyu Lu, Jun Zhu, Yang Pan, Wenya Lan, Chaoyong Xiao, Li Zhang
Functional connectivity (FC) between the subthalamic nucleus (STN) and the sensorimotor cortex is increased in off-medication patients with Parkinson's disease (PD). However, the status of FC between STN and sensorimotor cortex in on-medication PD patients remains unclear. In this study, resting state functional magnetic resonance imaging was employed on 31 patients with PD under medication and 31 healthy controls. Two-sample t-test was used to study the change in FC pattern of the STN, the FC strength of the bilateral STN was correlated with overall motor symptoms, while unilateral STN was correlated with offside motor symptoms...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28420972/multi-modal-multi-measure-and-multi-class-discrimination-of-adhd-with-hierarchical-feature-extraction-and-extreme-learning-machine-using-structural-and-functional-brain-mri
#17
Muhammad Naveed Iqbal Qureshi, Jooyoung Oh, Beomjun Min, Hang Joon Jo, Boreom Lee
Structural and functional MRI unveil many hidden properties of the human brain. We performed this multi-class classification study on selected subjects from the publically available attention deficit hyperactivity disorder ADHD-200 dataset of patients and healthy children. The dataset has three groups, namely, ADHD inattentive, ADHD combined, and typically developing. We calculated the global averaged functional connectivity maps across the whole cortex to extract anatomical atlas parcellation based features from the resting-state fMRI (rs-fMRI) data and cortical parcellation based features from the structural MRI (sMRI) data...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28420788/reconstructing-the-spectrotemporal-modulations-of-real-life-sounds-from-fmri-response-patterns
#18
Roberta Santoro, Michelle Moerel, Federico De Martino, Giancarlo Valente, Kamil Ugurbil, Essa Yacoub, Elia Formisano
Ethological views of brain functioning suggest that sound representations and computations in the auditory neural system are optimized finely to process and discriminate behaviorally relevant acoustic features and sounds (e.g., spectrotemporal modulations in the songs of zebra finches). Here, we show that modeling of neural sound representations in terms of frequency-specific spectrotemporal modulations enables accurate and specific reconstruction of real-life sounds from high-resolution functional magnetic resonance imaging (fMRI) response patterns in the human auditory cortex...
April 18, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28420129/hand-motion-detection-in-fnirs-neuroimaging-data
#19
Mohammadreza Abtahi, Amir Mohammad Amiri, Dennis Byrd, Kunal Mankodiya
As the number of people diagnosed with movement disorders is increasing, it becomes vital to design techniques that allow the better understanding of human brain in naturalistic settings. There are many brain imaging methods such as fMRI, SPECT, and MEG that provide the functional information of the brain. However, these techniques have some limitations including immobility, cost, and motion artifacts. One of the most emerging portable brain scanners available today is functional near-infrared spectroscopy (fNIRS)...
April 15, 2017: Healthcare (Basel, Switzerland)
https://www.readbyqxmd.com/read/28419607/subjective-and-objective-sleep-quality-modulate-emotion-regulatory-brain-function-in-anxiety-and-depression
#20
Heide Klumpp, Julia Roberts, Mary C Kapella, Amy E Kennedy, Anand Kumar, K Luan Phan
BACKGROUND: Disturbances in emotion regulation and sleep are shared across anxiety and mood disorders. Poor sleep has been shown to impair cognitive processes which may undermine cognitive regulatory function. However, it remains unknown if sleep quality impacts regulatory mechanisms in clinical anxiety and depression. METHODS: During fMRI, 78 patients with social anxiety disorder, generalized anxiety disorder, and/or major depressive disorder completed a validated emotion regulation task, which involved reappraisal (i...
April 18, 2017: Depression and Anxiety
keyword
keyword
97092
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"